Relevant bibliographies by topics / Pions neutres

Academic literature on the topic 'Pions neutres'

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Published: 28 February 2024

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Journal articles on the topic "Pions neutres"

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Manga, Peter J., E. W. Likta, and P. B. Teru. "COMPARATIVE STUDY ON CHARGED AND NEUTRAL PION-NUCLEON COUPLING CONSTANTS USING YUKAWA POTENTIAL MODEL." FUDMA JOURNAL OF SCIENCES 5, no. 4 (January 28, 2022): 167–73. http://dx.doi.org/10.33003/fjs-2021-0504-803.

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The meson field theory based on the Yukawa model for nuclear forces is estimated using a simple relationship between the charged and neutral pion- nucleon coupling constant. This signifies that the charged coupling constant is larger compared to the value obtains for neutral pions. Therefore since np interaction is stronger than the pp interaction, we look at the value obtained for charged pion – nucleon constant which gives good agreement with one of the recent experimental values, and then the splitting between the charged and neutral pion – nucleon coupling constants is practically the same as that between charged and neutral pion mass. In this case, the mass difference between the charged and neutral pion is also calculated to assess the amount of charge dependence of the Neutron – Neutron scattering length
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JOULAEIZADEH, L., J. BACELAR, M. ESLAMI-KALANTARI, I. GAŠPARIĆ, N. KALANTAR-NAYESTANAKI, H. LÖHNER, H. MARDANPOUR, et al. "PIONIC FUSION AT SUBTHRESHOLD ENERGIES." International Journal of Modern Physics A 24, no. 02n03 (January 30, 2009): 539–43. http://dx.doi.org/10.1142/s0217751x09044024.

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In order to study the role of pions and clustering phenomena in nuclei, two experiments have been performed using the AGOR accelerator facility. In collisions of two nuclei a pion and a fused nucleus were produced. The examined reactions were 4He(3He, π0)7Be and 6Li(4He, π0)10B at beam energies about 10 MeV above the coherent pion production threshold (256 MeV and 236.4 MeV, respectively). Since the available energy is well below the pion production threshold in an elementary nucleon-nucleon process, a highly coherent mechanism is needed. We identified the reaction by measuring the fused system in the magnetic spectrometer and the produced neutral pions in the Plastic Ball detection system with large acceptance. Our experimental setup provided the exclusive cross sections by identifying all products in overdetermined kinematics. Here we present the preliminary results of the analysis for the second reaction. Angular distribution of neutral pions will be discussed.
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KO, CHE MING, YONGSEOK OH, and JUN XU. "MEDIUM EFFECTS ON CHARGED PION RATIO IN HEAVY ION COLLISIONS." International Journal of Modern Physics E 19, no. 08n09 (September 2010): 1763–72. http://dx.doi.org/10.1142/s0218301310016193.

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We have recently studied in the delta-resonance–nucleon-hole model the dependence of the pion spectral function in hot dense asymmetric nuclear matter on the charge of the pion due to the pion p-wave interaction in nuclear medium. In a thermal model, this isospin-dependent effect enhances the ratio of negatively charged to positively charged pions in neutron-rich nuclear matter, and the effect is comparable to that due to the uncertainties in the theoretically predicted stiffness of nuclear symmetry energy at high densities. This effect is, however, reversed if we also take into account the s-wave interaction of the pion in nuclear medium as given by chiral perturbation theory, resulting instead in a slightly reduced ratio of negatively charged to positively charged pions. Relevance of our results to the determination of the nuclear symmetry energy from the ratio of negatively to positively charged pions produced in heavy ion collisions is discussed.
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ROBSON, B. A. "PARITY OF CHARGED PIONS." International Journal of Modern Physics E 20, no. 08 (August 2011): 1677–86. http://dx.doi.org/10.1142/s0218301311019659.

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This paper discusses the parity of charged pions. It is shown that the original determination of the parity of the negatively charged pion using the capture of negatively charged pions in deuterium to form two neutrons is not conclusive if the pion has a complex substructure. It is demonstrated that this experiment is compatible with the mixed-parity nature of the π- arising in a recent composite model. A major consequence of this is that CP may be conserved in the [Formula: see text] system.
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Dominguez, C. A., M. Loewe, and M. Lushozi. "Scalar Form Factor of the Pion in the Kroll-Lee-Zumino Field Theory." Advances in High Energy Physics 2015 (2015): 1–4. http://dx.doi.org/10.1155/2015/803232.

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The renormalizable Kroll-Lee-Zumino field theory of pions and a neutral rho-meson is used to determine the scalar form factor of the pion in the space-like region at next-to-leading order. Perturbative calculations in this framework are parameter-free, as the masses and the rho-pion-pion coupling are known from experiment. Results compare favorably with lattice QCD calculations.
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WOLFE, C. E., S. NOZAWA, M. N. BUTLER, and B. CASTEL. "POLARIZABILITY EFFECTS IN PION PHOTOPRODUCTION." International Journal of Modern Physics E 05, no. 01 (March 1996): 227–37. http://dx.doi.org/10.1142/s0218301396000116.

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We investigate the pion photoproduction reaction γN→γNπ as a probe of pion electromagnetic polarizability. This reaction had been proposed as having the potential to resolve the long standing discrepancy between measurements of pion polarizabilities and the predictions of Chiral Perturbation Theory. We have carried out a series of calculations of ratios of substructure — related to background contributions for energies below the Δ resonance — but have to report that the largest values are found in the high-energy tail of the photon spectrum and that these are of the order of 0.1% for charged pions and 1% for neutral pions. We conclude that these sensitivities are not yet accessible experimentally, and that this regime of energy should be excluded from current consideration.
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ZHANG, SUN, and FAN WANG. "RELATIVISTIC HYDRODYNAMICS WITH SPONTANEOUS CHIRAL SYMMETRY BREAKING." International Journal of Modern Physics E 12, no. 05 (October 2003): 675–81. http://dx.doi.org/10.1142/s0218301303001491.

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We study the hydrodynamics of the nuclear matter of two flavors of light quarks with spontaneous chiral symmetry breaking based on the Poisson bracket method. The effects of mass are included and the full hydrodynamic equation for pions is given. The in-medium dispersion relation of pions in the neutron rich background state and the possibility of the phase transition to pion condensation are also discussed.
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OBERLE, M., and B. KRUSCHE. "QUASIFREE PHOTOPRODUCTION OF PION-PAIRS OF PROTONS AND NEUTRONS." International Journal of Modern Physics: Conference Series 26 (January 2014): 1460106. http://dx.doi.org/10.1142/s2010194514601069.

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Beam-helicity asymmetries and mass-differential cross sections have been measured at the MAMI accelerator in Mainz for the photoproduction of neutral and mixed-charge pion pairs in the reactions γp → nπ0π+ and γp → pπ0π0 off free protons and γd → (p)pπ0π-, γd → (n)pπ0π0 and γd → (n)nπ0π+, γd → (p)nπ0π0 off quasi-free nucleons bound in the deuteron for incident photon energies up to 1.4 GeV. Circularly polarized photons were produced in bremsstrahlung processes of longitudinally polarized electrons and tagged with the Glasgow-Mainz magnetic spectrometer. The decay products (photons, protons neutrons and charged pions) were detected in the 4π electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. Using a full kinematic reconstruction of the final state, excellent agreement was found between the results for free and quasi-free protons, indicate that the quasi-free neutron results are also a close approximation of the free-neutron results. Comparison of the results to predictions of model calculations portend that especially the reaction mechanisms in the production of the mixed-charge final states are still not well understood, in particular at low incident photon energies in the second nucleon resonance region.
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Prozorov, Alexandr. "Neutral meson production in Ag+Ag at √SNN = 2.55 GeV." EPJ Web of Conferences 291 (2024): 04001. http://dx.doi.org/10.1051/epjconf/202429104001.

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Abstract. Relativistic nucleus-nucleus collisions offer a unique possibility for studying nuclear matter under the influence of high temperature and pressure. During the collision a system of interacting nucleons, resonances, and mesons, called hadronic fireball, is created. HADES is a unique experiment capable of simultaneously measuring all three species of pions for this energy regime. Results on neutral pion production in Ag + Ag collisions at √SNN = 2.55 GeV (beam energy 1.58 A GeV) with 14 billion collected events will be presented. A measurement of a directed and elliptic flow, and yields of neutral pions corrected for detector acceptance and efficiency will be shown with respect to transverse momentum and rapidity for certain centrality classes; and further compared with the data, and charged pion data measured in the same experiment. In addition, the obtained results will be confronted with up-to-date model calculations.
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Bäni, Lukas, Andreas Alexopoulos, Marina Artuso, Felix Bachmair, Marcin Bartosik, Helge Beck, Vincenzo Bellini, et al. "A Study of the Radiation Tolerance of CVD Diamond to 70 MeV Protons, Fast Neutrons and 200 MeV Pions." Sensors 20, no. 22 (November 20, 2020): 6648. http://dx.doi.org/10.3390/s20226648.

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We measured the radiation tolerance of commercially available diamonds grown by the Chemical Vapor Deposition process by measuring the charge created by a 120 GeV hadron beam in a 50 μm pitch strip detector fabricated on each diamond sample before and after irradiation. We irradiated one group of samples with 70 MeV protons, a second group of samples with fast reactor neutrons (defined as energy greater than 0.1 MeV), and a third group of samples with 200 MeV pions, in steps, to (8.8±0.9) × 1015 protons/cm2, (1.43±0.14) × 1016 neutrons/cm2, and (6.5±1.4) × 1014 pions/cm2, respectively. By observing the charge induced due to the separation of electron–hole pairs created by the passage of the hadron beam through each sample, on an event-by-event basis, as a function of irradiation fluence, we conclude all datasets can be described by a first-order damage equation and independently calculate the damage constant for 70 MeV protons, fast reactor neutrons, and 200 MeV pions. We find the damage constant for diamond irradiated with 70 MeV protons to be 1.62±0.07(stat)±0.16(syst)× 10−18 cm2/(p μm), the damage constant for diamond irradiated with fast reactor neutrons to be 2.65±0.13(stat)±0.18(syst)× 10−18 cm2/(n μm), and the damage constant for diamond irradiated with 200 MeV pions to be 2.0±0.2(stat)±0.5(syst)× 10−18 cm2/(π μm). The damage constants from this measurement were analyzed together with our previously published 24 GeV proton irradiation and 800 MeV proton irradiation damage constant data to derive the first comprehensive set of relative damage constants for Chemical Vapor Deposition diamond. We find 70 MeV protons are 2.60 ± 0.29 times more damaging than 24 GeV protons, fast reactor neutrons are 4.3 ± 0.4 times more damaging than 24 GeV protons, and 200 MeV pions are 3.2 ± 0.8 more damaging than 24 GeV protons. We also observe the measured data can be described by a universal damage curve for all proton, neutron, and pion irradiations we performed of Chemical Vapor Deposition diamond. Finally, we confirm the spatial uniformity of the collected charge increases with fluence for polycrystalline Chemical Vapor Deposition diamond, and this effect can also be described by a universal curve.
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Dissertations / Theses on the topic "Pions neutres"

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Mazzucato, Eddy. "Photoproduction de pions neutres sur le proton au voisinage du seuil." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37607801m.

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Fuchey, E. "Electroproduction de pions neutres dans le Hall A au Jefferson Laboratory." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00586093.

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La décennie passée a vu une forte évolution de l'étude de la structure des hadrons par les processus exclusifs, permettant d'accéder à une description plus complète de cette structure. Les processus exclusifs incluent la diffusion Compton profondément virtuelle, ainsi que la production exclusive de mesons à haute énergie. Ce document s'attache particulièrement à ce dernier, et plus particulièrement à la production exclusive de pions neutres. Cette thèse décrit l'analyse des événements en triple coïncidence H(e,e'gamma gamma)X, qui fut un sous produit abondant de l'expérience DVCS qui a eu lieu durant l'automne 2004 dans le Hall A au Jefferson Laboratory, afin d'extraire la section efficace de ep → epπ0 . Cette section efficace a été mesurée à deux valeurs de quadrimoment de tranfert Q2 =1.9 GeV2 et Q2 =2.3 GeV2 . La précision statistique accomplie pour ces mesures est meilleure que 5 %. Le domaine cinématique permet d'étudier l'évolution en Q2 et en W de la section efficace. Ces résultats ont été comparés avec des calculs inspirés de la phénoménologie de Regge, ainsi qu'avec les prédictions du formalisme des distributions de partons généralisées. Une interprétation dans le cadre de la diffusion profondément inélastique semi-inclusive est également discutée.
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Fuchey, Eric. "Electroproduction de pions neutres dans le Hall A au Jefferson Laboratory." Clermont-Ferrand 2, 2010. http://www.theses.fr/2010CLF22037.

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La décennie passée a vu une forte évolution de l'étude de la structure des hadrons par les processus exclusifs, permettant d'accéder à une description plus complète de cette structure. Les processus exclusifs incluent la diffusion Compton profondément virtuelle, ainsi que la production exclusive de mesons à haute énergie. Ce document s'attache particulièrement à ce dernier, et plus particulièrement à la production exclusive de pions neutres. Cette thèse décrit l'analyse des événements en triple H(e,égammagamma)X, qui fut un sous produit abondant de l'expérience DVCS qui a eu lieu durant l'automne 2004 dans le Hall A au Jefferson Laboratory, afin d'extraire la section efficace de ép ->eppi°. Cette section efficace a été mesurée à deux valeurs de quadrimoment de transfert Q2=1. 9GeV2 et Q2=2. 3GeV2. La précision statistique accomplie pour ces mesures est meilleur que 5%. Le domaine cinématique permet d'étudier l'évolution en Q2 et en W de la section. Ces résultats ont été comparés avec des calculs inspirés de la phénoménologie de Regge, ainsi qu'avec les prédictions du formalisme des distributions de partons généralisées. Une interprétation dans le cadre de la diffusion profondément inélastique semi-inclusive est également discutée
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Jammes, Laurent. "Photoproduction de pions neutres au voisinage du seuil sur les noyaux d'hélium 4, de carbone 12 et de calcium 40." Paris 11, 1988. http://www.theses.fr/1988PA112241.

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Nous présentons les résultats d'une mesure de section efficace totale de photo production de pions neutres sur les noyaux d'hélium 4, de carbone et de calcium, dans le domaine d'énergie de photons allant du seuil de réaction à 180 MeV, ainsi que des données prises à 148 MeV sur les noyaux de lithium 6 et de magnésium. Cette expérience a utilisé le faisceau de photons étiquetés obtenu par annihilation en vol des positrons délivrés par l'accélérateur Linéaire de Saclay (A. L. S. ) sur les électrons atomiques d'une cible d'hydrure de lithium. Le pion neutre est identifié par la détection en coïncidence de ses deux photons de désintégration, dans un ensemble de détecteurs en verre au plomb couvrant un grand angle solide. L'expérience sur l'hélium 4 a nécessité l'étude et la réalisation d'une cible cryogénique d'hélium liquide adaptée à la géométrie de l'installation. Un système de filtre a photons, fonctionnant sur le principe d'un spectromètre à paires, permet une mesure précise du flux incident. La détermination de la section efficace repose sur les analyses conjointes et similaires des événements caractéristiques de la création d'un pion ou d'une paire électron-positron, en coïncidence avec la détection d'un photon d'étiquetage. La simulation du fonctionnement du détecteur de pions neutres par une méthode de type Monte-Carlo, permet le calcul de l'efficacité de détection. Les deux calculs dont nous disposons, qui incluent la distorsion de l'onde du pion dans l'état final, sont tous deux en accord avec les données expérimentales, bien que leurs estimations en onde plane diffèrent notablement. Nous essayons de dégager l'origine de cette coïncidence provenant de l'utilisation, par les auteurs, de diverses simplifications cinématiques et de déterminations différentes du potentiel optique. Enfin, par la comparaison des prédictions d'un modèle simple d'approximation d'impulsion avec les sections efficaces expérimentales, nous déduisons pour chaque noyau, une évaluation de l'effet de l'interaction pion-noyau dans l'état final, relativement au carbone.
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Benhabib, Lamia. "Détection de pions neutres dans les collisions proton-proton à l'aide du spectromètre de photons PHOS de l'expérience ALICE auprès du LHC." Nantes, 2009. http://www.theses.fr/2009NANT2116.

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Les collisions d'ions lourds à des énergies ultra-relativistes permettent de créer de la matière nucléaire sous forme de Plasma de Quarks et de Gluons (PQG) puis de l’étudier grâce à de nombreuses observables proposées pour signer sa formation. Ce travail de thèse, en particulier, s’intéresse à la mesure de pions neutres (0) qui représente une sonde importante aussi bien pour la physique des collisions proton-proton que pour celle des collisions noyau-noyau. Dans le premier cas, elle permet de tester la chromodynamique quantique perturbative pQCD, théorie de l'interaction forte, et de contraindre les modèles théoriques. Elle servira ensuite de référence pour déceler des comportements anormaux dans les collisions noyau-noyau. Dédiée aux ions lourds, l'expérience ALICE auprès du collisionneur LHC, permet à l'aide, entre autres, de son spectromètre de photons PHOS, la mesure des 0 grâce à leur canal de désintégration en deux photons (0   ). PHOS couvrira un domaine en impulsion transverse variant de quelques centaines de MeV/c à quelques dizaines de GeV/c. Nous présentons, dans un premier temps, les prédictions théoriques sur la section efficace de production de pions neutres à l’ordre dominant et à l’ordre dominant suivant ainsi que le taux de comptage pour différents scénarios au LHC. Les coefficients correctifs à appliquer pour l’obtention d’un spectre de pions neutres sont ensuite calculés en termes d’acceptance géométrique, d’efficacité de reconstruction et d’efficacité du déclenchement. En outre, cette thèse consacre un chapitre plus technique au calibrage du premier module PHOS. Ceci a permis d’établir la carte des mauvais canaux
Ultra-relativistic Heavy-Ion Collisions (HIC) allow to create nuclear matter as Quark Gluon Plasma (QGP) and to study it through various observables proposed to highlight its formation, in particular, via measurements of neutral pions (0). The 0 measurement is an important probe for both proton and heavy ion physics. In the former case, it provides an important mean of testing pQCD as well as useful data to constrain current and future theoretical models. It will then serves as a baseline to detect abnormal behaviour in heavy ion collisions. Dedicated to heavy ion physics, the ALICE experiment at Large Hadron Collider, allows the identification of 0 mesons via their decay into two photons (0   ) using the high resolution photon spectrometer (PHOS). PHOS will measure over a wide range of transverse momentum, spanning from hundreds of MeV/c up to several tenths of GeV/c. In order to perform the first 0 spectrum measurement at LHC and compare it to theoretical predictions, an estimation of 0 production cross-section in proton-proton collisions is calculated in a leading order LO and a next-to-leading order (NLO) approximation and presented at a first place. We also discuss the Monte Carlo correction factors to apply for obtaining a realistic 0 spectrum as the geometrical acceptance, the identification efficiency and the trigger efficiency along with the analysis on the invariant mass. The quality of the measurement depends on the performance of PHOS detector. In particular calibration studies on the first PHOS module have also been performed yielding a map of bad channels
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Jammes, Laurent. "Photoproduction de pions neutres au voisinage du seuil sur les noyaux d'hélium-4, de carbone-12 et de calcium-40." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376144715.

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Charbonnier, Yves. "Processus collectifs et individuels de production de particules sous le seuil. Production de pions neutres et mesons dans la reaction ar+ca a 180a mev." Caen, 1997. http://www.theses.fr/1997CAEN2068.

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Ce travail a pour objet l'etude des processus collectifs et de collision nucleon-nucleon individuelle dans la production de particules sous le seuil. Dans ce but, et pour la premiere fois, nous avons simultanement etudie les taux de production des mesons et produits sous le seuil dans la reaction ar+ca a 180a mev. Notre revue des donnees experimentales preexistantes souligne l'interet specifique de ces particules comme sonde de la matiere nucleaire dense et chaude formee au cours des collisions entre ions lourds. Cette experience a ete realisee avec le multidetecteur taps au gsi. Le dispositif experimental et les techniques d'analyse utilisees nous ont permis d'obtenir les multiplicites et les sections efficaces de production de ces mesons. Il s'est avere que la production des mesons est 20 fois plus faibles que celle prevue par la systematique. De facon surprenante, il semble que la loi d'echelle en masse transverse soit encore valide a si faible energie. Nous avons demontre que la plupart des pions observes interagissent avec la matiere nucleaire via l'excitation des resonances. Enfin, nous avons observe que la multiplicite des pions augmente avec le nombre de nucleons participants mais de facon plus marquee pour les pions de grande masse transverse que pour l'ensemble des pions. Ceci est une indication claire que le mecanisme de production des particules tres energetiques, au dela de l'image d'un superposition de collisions de premiere chance, implique des processus collectifs et cooperatifs. Ces resultats ont ete confrontes avec les predictions de deux modeles dynamiques, et d'un modele statistique. Ces modeles sous-estiment fortement les sections efficaces et aucun n'est en mesure de fournir une vision coherente des processus mis en jeu.
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Aphecetche, Laurent. "Mecanismes de production de particules sous le seuil dans la matiere nucleaire froide : production de pions neutres et de photons dans les reactions proton-noyau a 190 mev." Caen, 1998. http://www.theses.fr/1998CAEN2066.

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Nous avons etudie la production des photons et des pions neutres dans la matiere nucleaire froide, et en particulier la production sous le seuil. Les particules produites sous le seuil dans les collisions d'ions lourds sont en effet des sources uniques d'information sur les caracteristiques de la matiere nucleaire chaude et dense qui est formee lors de ces collisions. Neanmoins, pour pouvoir pleinement utiliser ces sondes, leurs modes de creation et de propagation dans la matiere nucleaire doivent etre connus. Pour parvenir a cette fin les reactions proton-noyau ont ete etudiees a 190 mev. Ce choix elimine de nombreuses caracteristiques inconnues des collisions noyau-noyau qui conduisent a la production dans la matiere nucleaire chaude. Cette experience a ete realisee par la collaboration taps aupres de l'accelerateur franco-hollandais agor au kvi. La mesure concomitante des photons et des pions neutres a rendu possible la determination des sections efficaces de production des photons directs, en permettant d'estimer la contribution des photons issus de la decroissance des pions neutres au spectre total des photons mesures. Le grand nombre de particules detectees nous a permis d'etudier l'evolution des sections efficaces doublement differentielles en fonction de la masse du noyau cible. Cette evolution est notablement differente pour les particules (photons ou pions neutres) les plus energetiques. Il est clair que cette difference indique que le mecanisme de production des particules tres energetiques, au-dela de l'image d'une superposition incoherente de collisions nucleon-nucleon de premiere chance, implique des processus collectifs. Il apparait que le processus de diffusions multiples joue un role important pour la production des photons, production incoherente a basse energie, et coherente (cooperative) a plus haute energie de photon. La confrontation de ces resultats avec les predictions du modele de transport dcm montre les limites de la theorie. En particulier, la precision de la mesure effectuee de la production de particules pres de la limite cinematique (capture pionique du proton) depasse de loin les capacites actuelles du calcul theorique.
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Sazak, Halime. "Measuring the CP Violation Phase γ in open charm B decays at LHCb." Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2022. http://www.theses.fr/2022UCFAC115.

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Cette thèse présente l’étude de la mesure de l’angle CKM γ à travers deux analyses possibles à LHCb : première analyse, à partir de la mesure B_s^0→D ~^(┤)0 ϕ désintégration, où la notation D ~^0 désigne soit un D^0 ou un ¯D^0 méson reconstruit en mode de désintégration : Kππ^0, tandis que les ϕ désintégrations vers K^(+K^- ) ; la deuxième analyse, à partir du mode de désintégration plus conventionnel B^(-→D^0 K^- ), où D^0 se désintègre en K^(-π^+ ) (RS), K^(-K^+ ) , π^(-π^+ ) , π^(-K^+ ) (WS) et K^-est reconstruit en K^(-π^0 ). Les deux mesures pour les modes de désintégration utilisant la collision proton-proton sont basées sur une luminosité intégrée de 9.0 〖fb〗^(-1) collectée par le détecteur LHCb pendant les périodes d'exploitation Run 1 & Run 2, accumulées au cours des années 2011 à 2018
This thesis presents the study of the measurement of the CKM angle γ through two possible analysis at LHCb: first analysis, from the measurement of B_s^0→D ~^(┤)0 ϕ decay, where the notation D ~^0 stands for either a D^0 or a ¯D^0 meson reconstructed in sub-decay mode: Kππ^0, while the ϕ decays to K^(+K^- ); the second analysis, from the more conventional decay mode B^(-→D^0 K^- ), where D^0 decays to K^(-π^+ ) (RS), K^(-K^+ ), π^(-π^+ ), π^(-K^+ ) (WS) and K^- is reconstructed in K^(-π^0 ). Both measurements for the decay modes using proton-proton collision based on an integrated luminosity of 9.0〖fb〗^(-1) collected by the LHCb detector during Run 1 & Run 2, accumulated over years 2011 to 2018
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Fauth, Anderson Campos 1957. "Observações sobre os momentos transversais dos pions neutros e dos raios gamas do estado intermediário de massa ~3 GeV/c2 (mirim) na produção múltipla de mésons." [s.n.], 1986. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278131.

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Orientador: Kotaro Sawayanagi
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo:É obtida a distribuição de momento transversal dos pions neutros de 32 C-jatos Mirins com SEg > 20 TeV através de dois métodos de acoplamento 2g ® pº. Estes resultados independem de qualquer modelo de produção de partículas. Realiza-se uma simulação, pelo método de Monte Carlo, da produção de pions e avalia-se que os dois métodos conseguem obter em média aproximadamente 50% de acoplamentos corretos. Constata-se que a forma da distribuição dos pions neutros depende fracamente da porcentagem de acoplamentos corretos. A distribuição de momento transversal dos pions neutros dos eventos Mirins é obtida por uma terceira maneira, a qual é completamente independente das duas primeiras, que consiste da composição entre uma solução analítica e o método de Monte Carlo. Os resultados dos três métodos são consistentes entre si
Abstract: Not informed.
Mestrado
Física
Mestre em Física
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Books on the topic "Pions neutres"

1

Ormazabal, Gaston S. Single pion production in charged and neutral current neutrino interactions. Irvington-on-Hudson, N.Y: Nevis Laboratories, Columbia University, Physics Department, 1985.

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United States. Office of the Program Manager for Chemical Demilitarization, ed. Portable Isotopic Neutron Spectroscopy system: PINS. [Aberdeen Proving Ground, Md.?: PMCD, Program Manager for Chemical Demilitarization, 2001.

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United States. Office of the Program Manager for Chemical Demilitarization, ed. Portable Isotopic Neutron Spectroscopy system: PINS. [Aberdeen Proving Ground, Md.?: PMCD, Program Manager for Chemical Demilitarization, 2001.

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United States. Dept. of the Army, ed. Portable Isotopic Neutron Spectroscopy System (PINS). [S.l: s.n., 2001.

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1911-, Migdal A. B., ed. Pionnye stepeni svobody v i͡a︡dernom veshchestve. Moskva: "Nauka," Glav. red. fiziko-matematicheskoĭ lit-ry, 1991.

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Mörtsell, Anders. Neutral pion production in proton-proton collisions close to the kinematical threshold. Uppsala: Academia Upsaliensis, 1995.

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Gumplinger, Peter. A measurement of the neutral pion form factor by means of the reaction [pi]⁰ --> e⁺e⁻Þ. 1986.

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A direct measurement of the lifetime of the neutral pion. 1985.

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Close, Frank. 3. Powerful forces. Oxford University Press, 2015. http://dx.doi.org/10.1093/actrade/9780198718635.003.0003.

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Abstract:
Why do atomic nuclei exist at all? A large nucleus contains many protons in close proximity. Why do these protons, all with the same electrical charge, not mutually repel? ‘Powerful forces’ shows the answer: a strong attractive force that acts between neutrons and protons when they are in contact with one another. Further studies of atomic structure have revealed that protons and neutrons are not fundamental particles. They consist of smaller particles: pions, which are made up of quarks that possess a ‘colour’ charge. The relativistic quantum theory of colour, known as quantum chromo-dynamics (QCD), is described along with ‘quark–gluon plasma’.
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Axions, SN 1987A, and one pion exchange. Batavia, IL: Fermi National Accelerator Laboratory, 1988.

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Book chapters on the topic "Pions neutres"

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Nagl, Anton, Varadarajan Devanathan, and Herbert Überall. "Neutral pion photoproduction." In Springer Tracts in Modern Physics, 108–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/bfb0048462.

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Blattmann, Hans. "Treatment Planning and Optimization for Pion Therapy." In Boron Neutron Capture Therapy, 129–41. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3408-2_15.

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Rizo, P. "Tomography Using Neutron Radiography Photographs for a Beam of Several Fuel Pins." In Neutron Radiography, 703–10. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3871-7_87.

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Moss, R. L., and M. Beers. "Use of Epithermal Neutron Radiography to determine the extent of melting in mixed oxide LMFBR fuel pins irradiated in the High Flux Reactor, Petten." In Neutron Radiography, 349–57. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3871-7_45.

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Saraswat, Kapil, Prashant Shukla, Vineet Kumar, and Venktesh Singh. "Charged and Neutral Current Pion Production in Neutrino-Nucleus Scattering." In XXII DAE High Energy Physics Symposium, 697–700. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_166.

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Takatsuka, Tatsuyuki. "Characteristics of Pion-Condensed Neutron Stars Pulsar Glitch and Supernova 1987A." In Condensed Matter Theories, 281–93. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0971-0_25.

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Robson, Brian. "Generation Model of Particle Physics and the Parity of the Neutral Pion." In Exciting Interdisciplinary Physics, 345–55. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00047-3_29.

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Plasil, F. "Neutral Pion Production in Nucleus-Nucleus Collisions at 158 and 200 GeV/Nucleon." In Advances in Nuclear Dynamics 4, 247–53. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-9089-4_28.

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Larin, I. "A Precision Measurement of the Neutral Pion Life Time: Updated Results from the PrimEx Experiment." In NATO Science for Peace and Security Series B: Physics and Biophysics, 157–62. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2287-5_16.

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Panakkal, J. P., J. K. Ghosh, and P. R. Roy. "Nondestructive Characterization of Mixed Oxide Pellets in Welded Nuclear Fuel Pins by Neutron Radiography and Gamma-autoradiography." In Nondestructive Characterization of Materials, 832–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-84003-6_96.

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Conference papers on the topic "Pions neutres"

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Fuhrer, Andreas. "Photoproduction of neutral pions." In 6th International Workshop on Chiral Dynamics. Trieste, Italy: Sissa Medialab, 2010. http://dx.doi.org/10.22323/1.086.0054.

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Labnine, Aya, and Meghna Bhattacharya. "Neutral Pion Interactions in MicroBooNE." In Neutral Pion Interactions in MicroBooNE. US DOE, 2023. http://dx.doi.org/10.2172/1996524.

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Garcilazo, Humberto. "Bound states of negative pions and neutrons." In CAM-94 Physics meeting. AIP, 1995. http://dx.doi.org/10.1063/1.48795.

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Robson, Brian. "Parity of Pions and CP Violation in Neutral Kaon System." In 36th International Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.174.0321.

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Calen, H., A. Johansson, S. Kullander, H. Rubinstein, B. Trostell, L. Bergström, Z. Pawlowski, et al. "Rare decays of the neutral pion." In Particle production near threshold. AIP, 1991. http://dx.doi.org/10.1063/1.40377.

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Sakaguchi, Takao. "Neutral pion measurement at RHIC-PHENIX." In NUCLEAR PHYSICS IN THE 21st CENTURY:International Nuclear Physics Conference INPC 2001. AIP, 2002. http://dx.doi.org/10.1063/1.1469995.

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Melnitchouk, Wolodymyr. "Pion Structure from Leading Neutron Electroproduction." In Next Generation Nuclear Physics with JLab12 and EIC, Miami, FL, February 10, 2016. US DOE, 2016. http://dx.doi.org/10.2172/1987618.

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Egorov, Mikhail Viktorovich. "DOUBLE PHOTOPRODUCTION OF NEUTRAL PIONS ON LIGHT NUCLEI IN COHERENT REACTIONS." In XXII International Baldin Seminar on High Energy Physics Problems. Trieste, Italy: Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.225.0050.

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WIJESOORIYA, K. "PROTON POLARIZATION IN NEUTRAL PION PHOTO-PRODUCTION." In Proceedings of the Second International Symposium on the Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812705167_0052.

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Catala-Perez, J., Federico Sanchez, M. Sorel, and Luis Alvarez-Ruso. "Charged-Current Neutral Pion production at SciBooNE." In SIXTH INTERNATIONAL WORKSHOP ON NEUTRINO-NUCEUS INTERACTIONS IN THE FEW-GEV REGION (NUINT-09). AIP, 2009. http://dx.doi.org/10.1063/1.3274184.

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Reports on the topic "Pions neutres"

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Fuchey, Eric. Electroproduction of neutral pions in the Hall A at the Jefferson Laboratory; Electroproduction de pions neutres dans le Hall A au Jefferson Laboratory. Office of Scientific and Technical Information (OSTI), June 2010. http://dx.doi.org/10.2172/1054277.

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Torayev, Bayram. Electroproduction of the neutral pion off 4He. Office of Scientific and Technical Information (OSTI), December 2016. http://dx.doi.org/10.2172/1431178.

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Villano, Anthony. Neutral Pion Electroproduction in the Δ Resonance Region. Office of Scientific and Technical Information (OSTI), November 2007. http://dx.doi.org/10.2172/989189.

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Philips, Sasha A. Resonance Production through the Two Neutral-Pion Channel. Office of Scientific and Technical Information (OSTI), January 2002. http://dx.doi.org/10.2172/824914.

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Cavoto, Gianluca. Measurements of Charmless Two-Body Charged B Decays with Neutral Pions and Kaons. Office of Scientific and Technical Information (OSTI), June 2002. http://dx.doi.org/10.2172/799108.

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Nelson, Robert H. A Measurement of Neutrino-Induced Charged-Current Neutral Pion Production. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/978883.

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Kurimoto, Yoshinori. Measurement of Neutral Current Neutral Pion Production on Carbon in a Few-GeV Neutrino Beam. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/1249474.

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ISOBE, T., H. HAMAGAKI, T. SAKAGUCHI, G. DAVID, and S. MIODUSZEWSKI. MEASUREMENT OF NEUTRAL PION IN AU+AU COLLISIONS AT RHIC-PHENIX. Office of Scientific and Technical Information (OSTI), October 2005. http://dx.doi.org/10.2172/859892.

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Easo, Sajan. Structure of Events Containing Direct Photon or Neutral Pion in Hadronic Interactions. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/1375739.

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Vidnovic, Theodore, III. Di-Neutral Pion Production in the Triplet P Wave States of Charmonium. Office of Scientific and Technical Information (OSTI), December 2002. http://dx.doi.org/10.2172/1420946.

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