Готові списки джерел за темами / Leptonic CP Violation

Добірка наукової літератури з теми "Leptonic CP Violation"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Leptonic CP Violation"

1

LIU, YONG, and UTPAL SARKAR. "CP VIOLATION IN NEUTRINO MIXING MATRIX AND LEPTOGENESIS." Modern Physics Letters A 16, no. 09 (March 21, 2001): 603–13. http://dx.doi.org/10.1142/s0217732301003528.

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Анотація:
The CP violation required in leptogenesis may have different origin, but in an effective theory they are all related to the rephasing invariant CP violating measures in the mixing matrix of the leptonic sector. We point out that with our present knowledge of the mixing angles it is possible to estimate the maximum allowed value for all the rephasing invariant measures of CP violation in the leptonic sector. In the effective three-generation scenario there are three CP violating rephasing invariant measures. We show that only one rephasing invariant measure enters the lepton number conserving processes while the other two enter the lepton number violating processes. In the bimaximal mixing case, the lepton number conserving measure of CP violation vanishes while the two lepton number violating rephasing invariant measures of CP violation remain nonzero, which could contribute to the lepton asymmetry of the universe.
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2

Maalampi, J., and K. Mursula. "Leptonic CP-violation and mirror leptons." Nuclear Physics B 269, no. 1 (May 1986): 109–18. http://dx.doi.org/10.1016/0550-3213(86)90368-8.

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3

Petcov, S. T. "Leptonic CP violation and leptogenesis." International Journal of Modern Physics A 29, no. 11n12 (April 25, 2014): 1430028. http://dx.doi.org/10.1142/s0217751x14300282.

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Анотація:
The phenomenology of 3-neutrino mixing, the current status of our knowledge about the 3-neutrino mixing parameters, including the absolute neutrino mass scale, and of the Dirac and Majorana CP violation in the lepton sector, are reviewed. The problems of CP violation in neutrino oscillations and of determining the nature — Dirac or Majorana — of massive neutrinos, are discussed. The seesaw mechanism of neutrino mass generation and the related leptogenesis scenario of generation of the baryon asymmetry of the universe, are considered. The results showing that the CP violation necessary for the generation of the baryon asymmetry of the universe in leptogenesis can be due exclusively to the Dirac and/or Majorana CP-violating phase(s) in the neutrino mixing matrix U, are briefly reviewed.
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4

Hagedorn, C. "Leptonic CP violation theory." Journal of Physics: Conference Series 888 (September 2017): 012027. http://dx.doi.org/10.1088/1742-6596/888/1/012027.

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5

NASRI, S., J. SCHECHTER, and S. MOUSSA. "STUDY OF LEPTONIC CP VIOLATION." International Journal of Modern Physics A 19, no. 31 (December 20, 2004): 5367–75. http://dx.doi.org/10.1142/s0217751x04022608.

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Анотація:
The "complementary" Ansatz, Tr (Mν)=0, where Mν is the prediagonal neutrino mass matrix, seems a plausible approximation for capturing in a self contained way some of the content of Grand Unification. We study its consequences in the form of relations between the neutrino masses and CP violation phases.
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6

Grossman, Yuval. "Leptonic flavor and CP violation." Pramana 62, no. 2 (February 2004): 269–81. http://dx.doi.org/10.1007/bf02705088.

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7

Zeen Devi, H. "Correlations between low energy leptonic CP violation and leptogenesis in the light of recent experiments." International Journal of Modern Physics A 29, no. 20 (August 6, 2014): 1450104. http://dx.doi.org/10.1142/s0217751x14501048.

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Анотація:
Leptogenesis is the most favorable mechanism for generating the observed baryon asymmetry of the universe (BAU) which implies CP violation in the high energy scale. The low energy leptonic CP violation is expected to be observed in the neutrino oscillations and 0ν2β decay experiments. Generally, it is not possible to connect both the CP violations. Here we revisit the issue of connecting the two in flavored leptogenesis scenario within the Type I seesaw in the light of recent neutrino oscillation and Planck data. With the recent precise measurements of θ13 and BAU, we are able to find new correlations between the low and high energy CP violating phases when leptogenesis occurs at temperature between 109 to 1012 GeV and there is no contribution to CP violation from the heavy neutrino sector.
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8

Ahuja, Gulsheen, and Samandeep Sharma. "Texture zero mass matrices and CP violation." International Journal of Modern Physics A 32, no. 16 (June 8, 2017): 1742005. http://dx.doi.org/10.1142/s0217751x17420052.

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Анотація:
Within the Standard Model, using the facility of making Weak Basis transformations, attempt has been made to examine the most general mass matrices within the texture zero approach. For the case of quarks, interestingly, one finds a particular set of texture four zero quark mass matrices emerging out to be a unique viable option for the description of quark mixing data as well as for accommodation of CP violation. Similarly, general lepton mass matrices, essentially considered as texture zero mass matrices, yield interesting bounds on the CP violating Jarlskog’s rephasing invariant parameter in the leptonic sector.
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9

Tandean, Jusak, and G. Valencia. "CP violation in non-leptonic decays." Physics Letters B 451, no. 3-4 (April 1999): 382–87. http://dx.doi.org/10.1016/s0370-2693(99)00173-2.

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10

Minakata, Hisakazu, and Shinji Watanabe. "Solar neutrinos and leptonic CP violation." Physics Letters B 468, no. 3-4 (December 1999): 256–60. http://dx.doi.org/10.1016/s0370-2693(99)01224-1.

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Більше джерел

Дисертації з теми "Leptonic CP Violation"

1

Esteban, Muñoz Iván. "Leptonic CP Violation and its Origin." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/670870.

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Анотація:
At the end of the 20th century, experiments studying neutrinos coming from the Sun and cosmic rays hitting the atmosphere revealed that these particles can change their flavour, behaving in a way that the Standard Model (SM) explicitly forbids. The quest for understanding the properties of neutrinos, which may reveal the next underlying structure of Nature, has since then led thousands of scientists. The scenario when this thesis was initiated was driven by the latest experimental surprise that neutrinos provided: the initial hints towards their strong violation of the particle-antiparticle CP symmetry. Characterising the statistical significance, robustness and physical origin of that hint is the main goal that this work pursuits. For that, there is a rich programme of present and future long baseline (LBL) accelerator neutrino experiments. At the beginning of the development of this thesis, the LBL accelerator neutrino experiment NOvA released its first data. To obtain a global picture, this work combines it with the results of other relevant neutrino experiments. The status of leptonic mixing and CP violation is quantitatively assessed as LBL accelerator neutrino experiments kept releasing data. As the unknowns start getting clarified, the data points towards maximal CP violation. This hint is driven by an excess of electron neutrino appearance events in the LBL accelerator experiment T2K. In the three massive neutrino paradigm and with the other leptonic mixing parameters accurately measured by different experiments, the excess can only be accommodated by large CP violation. Nevertheless, three massive neutrinos is just a minimal extension of the SM: other new physics could be present, masking the results as direct leptonic CP violation has not yet been conclusively observed. This thesis confronts with data the scenario that is less bounded by other experiments: neutral current Non-Standard Interactions (NSI) among neutrinos and matter. Physically, they are generated by new interactions among neutrinos and matter mediated by potentially light particles. Due to the large parameter space involved, first just CP-conserving NSI (i.e., their moduli) are explored. Current bounds are evaluated, as well as the synergies and complementarity among different experiments. Thanks to the experiments working with various neutrino energies and travelled distances, the determination of leptonic mixing parameters is found to be quite robust. Thus, it is possible to move on and evaluate the current sensitivity to leptonic CP violation assuming the most generic CP-violating NSI are present. CP violation induced by neutrino masses and leptonic mixing is found to be quite robust, due to the large amount of neutrino flavour transition data collected along three decades. Nevertheless, the next generation LBL accelerator experiments are aimed at precision measurements that could be more severely affected. Luckily, in the last years the COHERENT experiment has provided independent constraints on NSIs. This experiment measures neutral current coherent neutrino-nucleus elastic scattering, a low momentum transfer process quite sensitive to NSI induced by potentially light mediators. In the final chapter of the thesis, the data from the COHERENT experiment is analysed and integrated into the global analyses from previous chapters. Particular attention is paid to how the results depend on the assumptions about the experiment background, nuclear structure, and detector response. Combining COHERENT data with flavour transition experiments unveils its incipient role in increasing the robustness of their interpretation. These first results could be greatly improved by increasing the statistics of the signal and/or by performing the measurements with different nuclei sensitive to different NSI models. For that, the European Spallation Source is an ideal future facility. It will produce a neutrino beam one order of magnitude more intense than the one used at COHERENT, and as it is still under construction there is potential space for various modern detectors. Its prospects for bounding NSI are also explored. In summary, this thesis deals with the current experimental hint for large CP violation in the leptonic sector. It first quantifies its global significance, and then moves on to checking its robustness against the framework in which the experimental data is interpreted. For that, complementary experiments on neutrino-nucleus coherent scattering play, and will keep on playing in the future, a significant role. Thus, a global approach is taken to rigorously assess whether cutting-edge leptonic flavour measurements are pointing towards a new strong violation of a symmetry of Nature.
A finales del siglo XX, una serie de experimentos que estudiaban neutrinos provenientes del Sol o de rayos cósmicos que colisionaban contra la atmósfera terrestre mostraron que estas partículas pueden cambiar su sabor, comportándose de una manera que el Modelo Estándar prohíbe explícitamente. El camino hacia la comprensión de las propiedades de los neutrinos, que podría revelar la siguiente estructura subyacente de la naturaleza, ha guiado desde entonces a miles de científicos. El escenario al inicio de esta tesis estaba impulsado por la última sorpresa experimental de los neutrinos: los primeros indicios que apuntan hacia su fuerte violación de la simetría materia-antimateria o CP. El objetivo de este trabajo es abordar el problema desde una perspectiva global para evaluar rigurosamente si las medidas punteras de física de sabor leptónico están apuntando hacia una nueva violación fuerte de una simetría de la naturaleza. Para ello, se combinan los resultados de todos los experimentos de neutrinos relevantes. Se evalúa cuantitativamente el estatus de la mezcla leptónica y de la violación de CP, que los datos apuntan a que podría ser máxima. Este indicio está dominado por un exceso de neutrinos electrónicos en el experimento de neutrinos con acelerador a larga distancia T2K. Dentro del paradigma de tres neutrinos masivos, y con el resto de parámetros de mezcla leptónica medidos con precisión en varios experimentos, el exceso solamente se puede acomodar mediante una violación de CP grande. A pesar de esto, tres neutrinos masivos es solamente una extensión mínima del Modelo Estándar: podría haber otra nueva física enmascarando los resultados, ya que la violación de CP leptónica aún no se ha medido de manera directa y concluyente. Por ello, esta tesis confronta la nueva física que podría afectar a los experimentos de transiciones de sabor de neutrinos con datos experimentales. La violación de CP inducida por las masas de los neutrinos y por la mezcla leptónica resulta ser bastante robusta. Tal y como se explora en este trabajo, los experimentos complementarios de interacción coherente entre neutrinos y núcleos juegan, y continuarán jugando en el futuro, un papel importante a este respecto.
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2

Girardi, Ivan. "Discrete Symmetry Approach to Lepton Flavour, Neutrino Mixing and Leptonic CP Violation, and Neutrino Related Physics Beyond the Standard Theory." Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4923.

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Анотація:
The experimental evidences of neutrino oscillation, caused by non-zero neutrino masses and neutrino mixing, which were obtained in the experiments with solar, atmospheric, accelerator and reactor neutrinos, opened new field of research in elementary particle physics. The principal goal is to understand at fundamental level the mechanism giving rise to non-zero neutrino masses and neutrino mixing. The open fundamental questions include those of the nature — Dirac or Majorana — of massive neutrinos, of the type of spectrum neutrino masses obey, of the status of CP symmetry in the lepton sector, of the absolute scale of neutrino masses, and more generally, of understanding the origin of flavour in particle physics. The smallness of neutrino masses suggests that their values are related to the existence of a new fundamental mass (energy scale) in particle physics, i.e., to New Physics beyond that predicted by the Standard Theory. The New Physics can manifest itself in the Majorana nature of massive neutrinos, in the existence of sterile neutrinos with masses at the eV scale, in the existence of new non-standard interactions (NSI) of neutrinos, etc. The present Ph.D. thesis explores aspects of this neutrino-related New Physics. More specifically, we first employ the discrete flavour symmetry approach i) to construct a self-consistent theory of lepton flavour, ii) to understand the pattern of neutrino mixing and to describe it quantitatively, and iii) to derive predictions for leptonic Dirac CP violation. Next we investigate the effects of existence of sterile neutrinos with a Majorana mass at the eV scale on the predictions for the neutrinoless double beta decay effective Majorana mass. Further we present a possible interpretation of the results of the reactor neutrino and accelerator experiments (Daya Bay, RENO, Double Chooz and T2K) on the reactor angle θ13 in the neutrino mixing matrix in terms of non-standard interactions (NSI) of neutrinos. We also analyse the signatures of sterile neutrinos in reactor antineutrino experiments and, in particular, constrain the active-sterile mixing angle using the high-precision data of the Daya Bay reactor experiment. We finally investigate the impact of sterile neutrinos on precision measurements of the standard neutrino oscillation parameters in the upcoming neutrino experiment JUNO.
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3

Vasquez, Carmona Juan Carlos. "Phenomenology of the right-handed lepton mixings at the LHC in LR symmetric theory and the Time-Reversal symmetry violation in the µ --> eϒ decay and µ --> e conversion process". Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4913.

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We study how the elements of the leptonic right-handed mixing matrix can be determined at the LHC in the minimal Left-Right symmetric extension of the standard model. We do it by explicitly relating them with physical quantities of the Keung-Senjanovi\'c process and the lepton number violating decays of the right doubly charged scalar. We also point out that the left and right doubly charged scalars can be distinguished at the LHC, without measuring the polarization of the final state leptons coming from their decays. Then we study time reversal symmetry violation in the $\mu\rightarrow e\gamma $ decay and the $\mu\rightarrow e$ conversion process and compute a T-odd triple vector correlation for the $\mu\rightarrow e\gamma $ decay and the $\mu\rightarrow e$ conversion process, finding simple results in terms of the CP violating phases of the effective Hamiltonians. Finally we focus on the minimal Left-Right symmetric extension of the Standard Model, which is a complete model of neutrino masses that can lead to an appreciable correlation. We show that under rather general assumptions, this correlation can be used to discriminate between Parity or Charge-conjugation as the discrete Left-Right symmetry.
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4

Athayde, Marcondes De André João Pedro. "Evaluation of the pi0 background for the nu_e appearance search in the T2K experiment : First study of the leptonic CP violation phase." Palaiseau, Ecole polytechnique, 2012. https://pastel.hal.science/docs/00/74/98/53/PDF/JP_thesis.pdf.

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Анотація:
L'expérience T2K est une expérience de recherche d'oscillation de saveur de neutrinos utilisant une base longue et la technique du faisceau hors axe. Dans T2K, un faisceau de neutrino est produit dans l'accélérateur J-PARC à Tokai, et est détecté auprès du détecteur Super Kamiokande (SK) à Kamioka, qui se situe à 295 km de Tokai. Cet accélérateur produit un faisceau très pur de nu_mu. Au cours de la propagation des neutrinos entre leur point de production et SK, ils peuvent changer de saveur. C'est ce phénomène que l'on appelle oscillation de saveur des neutrinos. L'objectif principal de T2K est de mesurer certains paramètres décrivant l'oscillation de saveur des neutrinos, et plus particulièrement les paramètres theta13 et deltaCP. Cette estimation est réalisée via la mesure de la probabilité d'oscillation nu_mu -> nu_e, par la recherche d'apparition de nu_e. En 2011, l'expérience T2K a été la première à observer l'apparition de nu_e et a ainsi pu exclure, à 2. 5 sigma, une valeur nulle de theta13. Cette thèse présente le travail réalisé pour estimer l'erreur systématique de l'efficacité de reconstruction du bruit de fond pi0. Celui-ci est l'une des principales sources d'erreur affectant la recherche d'apparition de nu_e par la détection d'événements quasi-élastique à courant chargé à SK. Deux méthodes différentes et complémentaires ont été développées. Dans un premier temps, nous avons commencé le développement d'un nouvel outil qui reproduit partiellement la topologie des événements physiques, et en parallèle, nous avons crée un échantillon spécifique pour estimer l'incertitude systématique de l'efficacité de reconstruction des événements pi0. Ce dernier résultat a été utilisé dans l'analyse officielle d'apparition de nu_e publiée en 2011. Le nouvel échantillon produit sera également utilisé dans les futures analyses d'oscillation. En tenant compte de la valeur récemment mesurée de theta13 par des expériences faites auprès de réacteur, nous présentons dans cette thèse la première étude de la phase de violation CP dans le secteur leptonique (deltaCP) en utilisant les données nu_e de T2K
The T2K experiment is an off-axis long baseline neutrino flavour oscillation experiment. In T2K, the neutrino beam produced by an accelerator at J-PARC, Tokai, is detected using the Super Kamiokande (SK) detector, Kamioka, located 295 km away from Tokai. The accelerator produce a very pure nu_mu beam. During the propagation of neutrinos between their production point and SK they may change flavour. This effect is the neutrino flavour oscillation. The main objective of T2K is to measure some parameters describing the neutrino flavour oscillation, in particular of theta13 and deltaCP. This determination is performed by measuring the nu_mu -> nu_e oscillation probability, via the nu_e appearance search. In 2011, T2K was the first experiment to observe nu_e appearance and published a 2. 5 sigma evidence that theta13 is not null. In this thesis we present the work done on the evaluation of the systematic error on the pi0 background reconstruction efficiency. The pi0 background is one of the main background sources affecting the nu_e appearance search through the detection of nu_e charged current quasi-elastic events at SK. Two different and complementary approaches have been developed. First, we have started developing a new device that partially reproduces the topology of physics events. Second, we have created a specific sample to estimate the systematic uncertainty of pi0 events reconstruction efficiency. This result was used in the official 2011 nu_e search. Furthermore, results from this sample will be used in future extended oscillation analysis. We also present the first study of the leptonic CP violation phase (deltaCP) using T2K nu_e data, assuming the recently measured value of theta13 by reactor experiments
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5

Lessnoff, Kenneth. "A Study of the LHCb Experiment's Sensitivity to CP Violation in Mixing and to Production Asymmetry in Bs Mesons, Using Semi-Leptonic Decays." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520230.

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6

Molinaro, Emiliano. "CP Violation in the Lepton Sector, Thermal Leptogenesis and Lepton Flavour Violating Processes." Doctoral thesis, SISSA, 2010. http://hdl.handle.net/20.500.11767/4150.

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Анотація:
It is a well established experimental fact that the Universe is strongly asymmetric in its matter and antimatter content. Indeed, there is no direct/indirect evidence up to now about the formation of primordial stars or galaxies made entirely of antiparticles. The only clear observation of antimatter in the Universe, besides the one created in particle accelerators, resides on the measurement of the cosmic ray flux through the Earth.....
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7

Capriotti, Lorenzo. "Searches for new physics in violation of strong CP symmetry and lepton universality with the LHCb experiment." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/searches-for-new-physics-in-violation-of-strong-cp-symmetry-and-lepton-universality-with-the-lhcb-experiment(38402bea-f90e-4e66-a0da-93dd4033e155).html.

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Mogini, Andrea. "Search for the Lepton Flavour Violating decay B0 → K∗0τ±μ∓ with the LHCb detector and pattern recognition for the upgrade with the SciFi Tracker". Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS367.

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Анотація:
Dans cette thèse je présente les résultats d'études sur la performance d'algorithmes dédiés à la reconstruction des trajectoires de particules chargés avec le trajectographe SciFi, qui sera installé dans l'expérience LHCb pendant son upgrade. Les performances augmentent en termes d'efficacité de reconstruction ainsi que de temps de calcul si une ou deux couches de fibres scintillantes additionnelles sont utilisées. Les stratégies de reconstruction alternatives testées sans couches additionnelles permettent d'obtenir un gain en termes de temps de calcul au détriment des efficacités de reconstruction. Je présente aussi la recherche pour la désintégration violant la conservation de la saveur leptonique B0 → K∗0τ±μ∓, en détaillant la sélection employée sur les données et le traitement statistique utilisé pour quantifier la sensibilité de l'analyse et obtenir des valeurs de l'ordre de O(10−5) pour les limites attendues
In this thesis I report the results of performance studies conducted on the pattern recognition algorithm dedicated to the Scintillating Fibre Tracker to be installed in the LHCb detector during its upgrade. The performance increases both in terms of reconstruction efficiencies and in processing time when working with additional scintillating fibre layers. The alternative tracking strategies tested allow for an improvement on the timing end at the cost of the reconstruction efficiencies. I also detail the selection and limit extraction procedure put in place for the search of the Lepton Flavour Violating decay B0 → K∗0τ±μ∓, finding expected limits at the level of I also detail the selection and limit extraction procedure put in place for the search of the Lepton Flavour Violating decay B0 → K∗0τ±μ∓, finding expected limits of O(10−5)
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9

Pazzini, Jacopo. "B flavour tagging with leptons and measurement of the CP violation phase phi_s in the B_s^0 -> J/psi phi decay at the CMS experiment." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424307.

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Анотація:
This thesis presents the development and optimization of an algorithm used to determine the flavour at production time of neutral B^0 and B_s^0 mesons. The flavour tagging algorithm developed in this thesis exploits muons and electrons produced in the semileptonic decay of the additional b-hadron produced in pp -> bbX collisions at the LHC. The charge of the lepton is used to infer the flavour of the neutral b-meson. Three simulated samples of B_s^0 -> J/psi phi, B^+ -> J/psi K^+ and B^0 -> J/psi K* decays are exploited to develop and test the algorithm. Two independent neural networks are defined for muons and electrons, trained on 24 000 and 20 400 simulated B_s^0 -> J/psi phi events respectively, to parametrize the probability of wrong flavour tag omega of the algorithm. The tagging performances are further measured and calibrated on a sample of self-tagging B^+ -> J/psi K^+ decays collected by the CMS experiment during 2012, corresponding to 20 fb^-1 . The charge of the kaon univocally determines the flavour of the B^+ at production time and allows the direct measure of the mis-identification probability. A tagging power P_tag = epsilon_tag (1 - 2 omega )^2 of 0.833 +/- 0.024 (stat.) +/- 0.012 (syst.) % is measured using muons and 0.483 +/- 0.020 (stat.) +/- 0.003 (syst.) % using electrons. Combining the two algorithms results in the overall tagging power of 1.307 ± 0.031 (stat.) ± 0.007 (syst.) %. The combined lepton flavour tagging algorithm is used in the measurement of the charge-parity (CP) violation parameters phi_s and DeltaGamma_s , sensitive to potential new physics processes not included in the standard model description. A time-dependent and flavour-tagged full angular analysis of the mu^+ mu^- K^+ K^- final state of the B_s^0 -> J/psi phi decay is performed based on the 2012 CMS dataset. A total of 49 000 reconstructed B_s^0 decays are used to extract the weak phase phi_s and decay with difference DeltaGamma_s values: phi_s = -0.075 +/- 0.097 (stat.) +/- 0.031 (syst.) rad DeltaGamma_s = 0.095 +/- 0.013 (stat.) +/- 0.007 (syst.) ps^-1
In questa tesi e' presentato lo sviluppo e l'ottimizzazione di un algoritmo per la determinazione del sapore di produzione di mesoni neutri B^0 e B_s^0 , che sfrutta muoni ed elettroni prodotti nel decadimento semileptonico dell'altro adrone-b prodotto nel processo pp -> bbX a LHC. La carica dei leptoni e' utilizzata per identificare il sapore del mesone-b neutro. Tre campioni di eventi simulati contenenti i decadimenti B_s^0 -> J/psi phi, B^+ -> J/psi K^+ e B^0 -> J/psi K^+ sono sfruttati per lo sviluppo e il controllo delle prestazioni dell'algoritmo. Due reti neurali sono definite separatamente per muoni ed elettroni ed utilizzate per parametrizzare la probabilita' di errata attribuzione del sapore omega dell'algoritmo, utilizzando rispettivamente 24 000 e 20 400 eventi simulati contenenti decadimenti B_s^0 -> J/psi phi. Le prestazioni dell'algoritmo sono inoltre misurate e calibrate su un campione di eventi B^+ -> J/psi K^+ raccolti dall'esperimento CMS nel corso del 2012, pari a 20 fb^-1 . La carica del kaone determina univocamente il sapore del B+ al momento della produzione e consente la misura diretta della probabilita' di errata attribuzione del sapore. Il potere di identificazione dell'algoritmo P_tag = epsilon_tag (1 - 2 omega )^2 , e' misurato essere pari a 0.833 +/- 0.024 (stat.) +/- 0.012 (syst.) % per i muoni e 0.483 +/- 0.020 (stat.) +/- 0.003 (syst.) % per gli elettroni. Il potere di identificazione risultante dalla combinazione dei due algoritmi e' 1.307 +/- 0.031 (stat.) +/- 0.007 (syst.) %. L'algoritmo combinato di identificazione del sapore e' utilizzato nella misura dei parametri phi_s e DeltaGamma_s di violazione della simmetria CP, sensibili a potenziali processi di nuova fisica non inclusi nella descrizione del modello standard. Utilizzando il campione di dati raccolti dall'esperimento CMS nel corso del 2012, e' eseguita una analisi angolare dipendente dal tempo dello stato finale mu^+ mu^- K^+ K^- del decadimento B_s^0 -> J/psi phi, includendo nell'analisi l'algoritmo di identificazione del sapore. Un totale di 49 000 decadimenti ricostruiti del mesone B_s^0 sono utilizzati per estrarre il valore sperimentale della fase debole phi_s e la differenza di vita media DeltaGamma_s : phi_s = -0.075 +/- 0.097 (stat.) +/- 0.031 (syst.) rad DeltaGamma_s = 0.095 +/- 0.013 (stat.) +/- 0.007 (syst.) ps^-1
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10

Cohen-Tanugi, Johann. "Mesure de sin2 beta. Violation de CP dans les canaux charmonium, contribution du canal J/$\psi$ K$^(*0)$(K$^0_s\pi^0$)." Phd thesis, Université Paris-Diderot - Paris VII, 2001. http://tel.archives-ouvertes.fr/tel-00006390.

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Книги з теми "Leptonic CP Violation"

1

Van, Tran J. Thanh, ed. Progress in electroweak interactions: Proceedings of the Leptonic Session of the Twenty-First Rencontre de Moriond, Les Arcs, Savoie, France, March 9-16, 1986. Gif sur Yvette, France: Editions Frontières, 1986.

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2

International Symposium on Lepton and Baryon Number Violation (1st 1998 Trento, Italy). Lepton and baryon number violation in particle physics, astrophysics, and cosmology: Proceedings of the First International Symposium on Lepton and Baryon Number Violation (Lepton-Baryon 98), European Centre for Theoretical Physics, Trento, Italy, 20-25 April 1998. Bristol: Institute of Physics Pub., 1999.

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3

International School of Physics "Enrico Fermi" (2005 Varenna, Italy). CP violation: From quarks to leptons : proceedings of the International School of Physics "Enrico Fermi", Varenna on Lake Como, Villa Monastero, 19-29 July 2005. Amsterdam: IOS Press, 2006.

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4

Peterburgskiĭ institut i͡a︡dernoĭ fiziki im. B.P. Konstantinova., ed. Problems of high energy physics: International winter school on theoretical high energy physics, PNPI : January 25 - February 6, 1993. St. Petersburg: PNPI, 1993.

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5

Progress in electroweak interactions: Proceedings of the Leptonic Session of the Twenty-First Rencontre de Moriond, Les Arcs, Savoie, France, March 9-16, 1986. Editions Frontieres, 1986.

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6

Sanda, A. I., M. Giorgi, and I. Mannelli. CP Violation: From Quarks to Leptons. IOS Press, Incorporated, 2006.

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7

Vigdor, Steven E. Trinity. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814825.003.0003.

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Анотація:
Chapter 3 explains evidence for three generations of quarks and leptons, as needed to provide natural means for standard model CP violation. It describes the cross-generational mixing of quarks and of neutrinos of different flavor, and the matrices that characterize the mixing. CP violation from quark mixing is well measured but insufficient to explain the universe’s matter–antimatter imbalance, while CP violation in neutrino mixing is the subject of ongoing searches. Discoveries revealing and quantifying flavor oscillations among neutrinos from the sun and the atmosphere are reviewed. In describing attempts to understand the lightness and nature of neutrinos—whether they are Majorana neutrinos that are their own antiparticles—the chapter introduces the concept of chirality and searches for neutrinoless double beta decay. It also notes the strong CP problem, wherein nature maintains CP symmetry in interactions among the three quark colors even though quantum chromodynamics allows for sizable violations.
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8

CP Violation: From Quarks to Leptons (International School of Physics Enrico Fermi) (Proceedings of the International School of Physics "Enrico Fermi"). Ios Pr Inc, 2006.

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9

(Editor), H. V. Klapdor-Kleingrothaus, and I. V. Krivosheina (Editor), eds. Lepton and Baryon Number Violation in Particle Physics, Astrophysics and Cosmology: Proceedings of the First International Symposium on Lepton and Baryon ... Theoretical Studies (ECT), Trento, Italy, 2. Taylor & Francis, 1999.

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10

(Editor), Yoshitaka Kuno, William R. Molzon (Editor), and Sandip Pakvasa (Editor), eds. New Initiatives on Lepton Flavor Violation and Neutrino Oscillation With High Intensity Muon and Neutrino Sources. World Scientific Publishing Company, 2003.

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Частини книг з теми "Leptonic CP Violation"

1

Verma, Surender, Shankita Bhardwaj, B. C. Chauhan, and Gazal Sharma. "Probing CP Violation in Neutrino Oscillation Experiments and Leptonic Unitarity Quadrangle." In XXII DAE High Energy Physics Symposium, 257–61. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_58.

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2

Stech, Berthold. "Charged Current Mixing and CP-Violation." In Quarks, Leptons, and Beyond, 81–93. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-2254-0_2.

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3

Iliopoulos, J., and T. N. Tomaras. "The Weak Interactions." In Elementary Particle Physics, 348–87. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192844200.003.0018.

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Анотація:
We present the phenomenology of the weak interactions in a historical perspective, from Fermi’s four-fermion theory to the V−A current×current interaction. The experiments of C.S. Wu, which established parity violation, and M. Goldhaber, which measured the neutrino helicity, are described. We study in turn the leptonic, semi-leptonic and non-leptonic weak interactions. We introduce the concept of the conserved vector current and the partially conserved axial current and show that the latter is the result of spontaneously broken chiral symmetry with the pion the corresponding pseudo-Goldstone boson. We study Gell–Mann’s current algebra and derive the Adler–Weisberger relation. Strangeness changing weak interactions and the Cabibbo theory are described. We present a phenomenological analysis of CP-violation in the neutral kaon system and we end with the intermediate vector boson hypothesis.
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4

Iliopoulos, J., and T. N. Tomaras. "The Standard Model and Experiment." In Elementary Particle Physics, 442–78. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192844200.003.0022.

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Анотація:
We review some basic experiments which established the validity of the Standard Model. They include the discovery of charm as well as the other two heavy quark flavours, that of the intermediate vector bosons W± and Z and of the BEH scalar. We show the successes of the model in the domain of hadron spectroscopy, but also its shortcomings. The rich subject of CP-violation in the hadronic and the leptonic sectors is reviewed, as well as the questions of flavour violating transitions. We end with an overall comparison between theory and experiment and point out the few cases in which some tension persists.
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5

"Violation of CP invariance." In Leptons and Quarks, 94–102. WORLD SCIENTIFIC, 2014. http://dx.doi.org/10.1142/9789814603133_0012.

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6

Pospelov, Maxim, and Adam Ritz. "Probing CP Violation with Electric Dipole Moments." In Lepton Dipole Moments, 439–518. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814271844_0013.

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7

"CP violation in the transitions of leptons." In New Era for CP Asymmetries, 161–83. WORLD SCIENTIFIC, 2021. http://dx.doi.org/10.1142/9789813233089_0009.

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8

Terranova, Francesco. "At the forefront of the Standard Model." In A Modern Primer in Particle and Nuclear Physics, 368–419. Oxford University PressOxford, 2021. http://dx.doi.org/10.1093/oso/9780192845245.003.0013.

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Анотація:
Abstract The final chapter covers the least-known territories of the Standard Model (SM). It describes the Higgs mechanism using classical relativistic fields. We present the greatest achievement of the Large Hadron Collider (LHC): the discovery of the Higgs boson in 2012. The Higgs mechanism originates fermion masses, too. Lepton masses are covered first: the discovery of neutrino oscillations and the Pontecorvo–Maki–Nakagawa–Sakata (PMNS) mixing matrix. It then turns to the quark sector, stressing similarities and differences with leptons, especially in meson oscillations. The complex phase of the quark mixing matrix (CKM) and the evidence for CP violation are covered. Finally, the chapter looks at the failures of the Standard Model, introducing the idea of naturalness and the dark matter–dark energy problem. The book concludes with two masterpieces of experimental ingenuity that address these issues. The direct search of dark matter by XENON1T (2017) and the observation of gravitational waves by LIGO (2016).
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9

Iliopoulos, J., and T. N. Tomaras. "A Gauge Theory for the Weak and Electromagnetic Interactions." In Elementary Particle Physics, 388–404. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192844200.003.0019.

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Анотація:
In this chapter we develop the Glashow–Weinberg–Salam theory of electromagnetic and weak interactions based on the gauge group SU(2) × U(1). We show that the apparent difference in strength between the two interactions is due to the Brout–Englert–Higgs phenomenon which results in heavy intermediate vector bosons. The model is presented first for the leptons, and then we argue that the extension to hadrons requires the introduction of a fourth quark. We show that the GIM mechanism guarantees the natural suppression of strangeness changing neutral currents. In the same spirit, the need to introduce a natural source of CP-violation leads to a six quark model with the Cabibbo–Kobayashi–Maskawa mass matrix.
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10

Zinn-Justin, Jean. "The Standard Model (SM) of fundamental interactions." In Quantum Field Theory and Critical Phenomena, 567–92. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198834625.003.0023.

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Анотація:
The Standard Model (SM) 2020 of weak, electromagnetic and strong interactions, based on gauge symmetry and spontaneous symmetry breaking, describes all known fundamental interactions at the microscopic scale except gravity and, perhaps, interactions with dark matter. The SM model has been tested systematically in collider experiments, and in the case of strong interactions (quantum chromodynamics) also with numerical simulations. With the discovery in 2012 of the Higgs particle at the Large Hadron Collider (LHC) at the European Council for Nuclear Research (CERN), all particles of the SM have been identified, and most parameters have been measured. Still, the Higgs particle remains the most mysterious particle of the SM, since it is responsible for all the parameters of the SM except gauge couplings and since it leads to the fine-tuning problem. The discovery of its origin, and the precise study of its properties should be, in the future, one of the most important field of research in particle physics. Since we know now that the neutrinos have masses, the simplest extension of the SM implies Dirac neutrinos. With such a minimal modification, consistent so far (2020) with experimental data, the lepton and quark sectors have analogous structures: the lepton sector involves a mixing matrix, like the quark sector (three angles have been determined, the fourth charge conjugation parity (CP) violating angle is still unknown).
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Тези доповідей конференцій з теми "Leptonic CP Violation"

1

LIU, Zhiqing. "Exotics in leptonic machines." In Flavor Physics & CP Violation 2015. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.248.0042.

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2

Malbrunot, Chloe. "Leptonic pion decays." In Flavor Physics and CP Violation 2009. Trieste, Italy: Sissa Medialab, 2010. http://dx.doi.org/10.22323/1.085.0057.

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3

Simonetto, Cristoforo. "Rare Leptonic Decays." In Flavor Physics and CP Violation 2009. Trieste, Italy: Sissa Medialab, 2010. http://dx.doi.org/10.22323/1.085.0046.

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4

PARK, Chan Seok. "Purely leptonic and radiative leptonic B decays from the e+e- B-factories." In Flavor Physics & CP Violation 2015. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.248.0013.

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5

Virto, Javier. "Charmless non-leptonic B decays." In Flavor Physics and CP Violation. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.280.0007.

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6

Misiak, Mikolaj. "Radiative and Rare Leptonic Decays." In Flavor Physics and CP Violation 2010. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.116.0025.

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7

Achelashvili, Avtandil, and Zurab Tavartkiladze. "Leptonic CP violation and leptogenesis." In CETUP* 2016: Workshop on Neutrino Physics and Unification, Near Detector Physics and Dark Matter. Author(s), 2017. http://dx.doi.org/10.1063/1.5010116.

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8

REBELO, M. N. "LEPTONIC CP VIOLATION AND LEPTOGENESIS." In Proceedings of the 6th International Heidelberg Conference. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812814357_0018.

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9

PETCOV, S. T. "LEPTONIC CP VIOLATION AND LEPTOGENESIS." In Conference in Honour of the 90th Birthday of Freeman Dyson. WORLD SCIENTIFIC, 2014. http://dx.doi.org/10.1142/9789814590112_0009.

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10

Rong, Gang. "Recent Experimental Results on Semi-leptonic D Decays and Extraction of |Vcd(s)|." In Flavor Physics & CP Violation 2015. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.248.0031.

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Звіти організацій з теми "Leptonic CP Violation"

1

Farzan, Yasaman. Leptonic Unitarity Triangle and CP-Violation. Office of Scientific and Technical Information (OSTI), February 2002. http://dx.doi.org/10.2172/798993.

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2

William R. Molzon and Bruce D. Winstein. The physics of kaon decays: CP violation and lepton flavor nonconservation. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/766396.

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