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Academic literature on the topic 'Yukawa couplings'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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Journal articles on the topic "Yukawa couplings"

1

CASAS, J. A., F. GOMEZ, and C. MUÑOZ. "COMPLETE STRUCTURE OF Zn YUKAWA COUPLINGS." International Journal of Modern Physics A 08, no. 03 (January 30, 1993): 455–505. http://dx.doi.org/10.1142/s0217751x93000187.

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We give the complete twisted Yukawa couplings for all the Zn orbifold constructions in the most general case, i.e. when orbifold deformations are considered. This includes a certain number of tasks. Namely, determination of the allowed couplings, calculation of the explicit dependence of the Yukawa couplings values on the moduli expectation values (i.e. the parameters determining the size and shape of the compactified space), etc. The final expressions are completely explicit, which allows a counting of the different Yukawa couplings for each orbifold (with and without deformations). This knowledge is crucial to determine the phenomenological viability of the different schemes, since it is directly related to the fermion mass hierarchy. Other facts concerning the phenomenological profile of Zn orbifolds are also discussed, e.g. the existence of nondiagonal entries in the fermion mass matrices, which is related to a nontrivial structure of the Kobayashi-Maskawa matrix. Some theoretical results are also given, e.g. the non-participation of (1,2) moduli in twisted Yukawa couplings. Likewise, (1,1) moduli associated with fixed tori which are involved in the Yukawa coupling, do not affect the value of the coupling. We discuss the relevance of these facts for the supersymmetry breaking process.

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Cherchiglia, Adriano, Dominik Stöckinger, and Hyejung Stöckinger-Kim. "The muon g – 2 for low-mass pseudoscalar Higgs in the general 2HDM." EPJ Web of Conferences 179 (2018): 01022. http://dx.doi.org/10.1051/epjconf/201817901022.

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The two-Higgs doublet model is a simple and attractive extension of the Standard Model. It provides a possibility to explain the large deviation between theory and experiment in the muon g – 2 in an interesting parameter region: light pseudoscalar Higgs A, large Yukawa coupling to τ-leptons, and general, non-type II Yukawa couplings are preferred. This parameter region is explored, experimental limits on the relevant Yukawa couplings are obtained, and the maximum possible contributions to the muon g – 2 are discussed.

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KOBAYASHI, TATSUO. "MINIMAL STRING UNIFICATION AND YUKAWA COUPLINGS IN ORBIFOLD MODELS." International Journal of Modern Physics A 10, no. 10 (April 20, 1995): 1393–411. http://dx.doi.org/10.1142/s0217751x9500067x.

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We study the minimal supersymmetric standard model derived from ZN×ZM orbifold models. Moduli-dependent threshold corrections of gauge couplings are investigated to explain the measured values of the coupling constants. We also study the Yukawa couplings of the models. We find that the Z2×Z2×Z6′, Z3×Z6 and Z6×Z6 orbifold models have the possibility of deriving Yukawa couplings for the second and third generations as well as the measured gauge coupling constants. Allowed models are shown explicitly by combinations of modular weights for the matter fields.

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Sashikanta Singh, Konsam, and N. Nimai Singh. "Effects of the Variation of SUSY Breaking Scale on Yukawa and Gauge Couplings Unification." Advances in High Energy Physics 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/652029.

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The present analysis addresses an interesting primary question on how do the gauge and Yukawa couplings unification scales vary with varying SUSY breaking scalesms, assuming a single scale for all supersymmetric particles. It is observed that the gauge coupling unification scale increases withmswhereas third-generation Yukawa couplings unification scale decreases withms. The rising of the unification scale and also the mass of the color triplet multiplets is necessary to increase the proton decay lifetime; the analysis is carried out with two-loop RGEs for the gauge and Yukawa couplings within the minimal supersymmetric SU(5) model, while ignoring for simplicity the threshold effects of the heavy particles, which could be as large as a few percentages.

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LUCHA, WOLFGANG, and MICHAEL MOSER. "CLIFFORD ALGEBRAS IN FINITE QUANTUM FIELD THEORIES I." International Journal of Modern Physics A 13, no. 13 (May 20, 1998): 2047–73. http://dx.doi.org/10.1142/s0217751x98000901.

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Finite quantum field theories may be constructed from the most general renormalizable quantum field theory by forbidding, order by order in the perturbative loop expansion, all ultraviolet-divergent renormalizations of the physical parameters of the theory. The relevant finiteness conditions resulting from this requirement relate all dimensionless couplings in the theory. At first sight, Yukawa couplings which are equivalent to the generators of some Clifford algebra with identity element represent a very promising type of solutions of the condition for one-loop finiteness of the Yukawa couplings. However, under a few reasonable and simplifying assumptions about their particular structure, these Clifford-like Yukawa couplings prove to be in conflict with the requirements of one- and two-loop finiteness of the gauge coupling and of the absence of gauge anomalies, at least for all simple gauge groups up to and including rank 8.

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Giudice, Gian F., and Oleg Lebedev. "Higgs-dependent Yukawa couplings." Physics Letters B 665, no. 2-3 (July 2008): 79–85. http://dx.doi.org/10.1016/j.physletb.2008.05.062.

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Fraser, Sean, and Ernest Ma. "Anomalous Higgs Yukawa couplings." EPL (Europhysics Letters) 108, no. 1 (October 1, 2014): 11002. http://dx.doi.org/10.1209/0295-5075/108/11002.

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Branco, Gustavo C., and J. I. Silva-Marcos. "Non-hermitian Yukawa couplings?" Physics Letters B 331, no. 3-4 (July 1994): 390–94. http://dx.doi.org/10.1016/0370-2693(94)91069-3.

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Stephenson, D., and A. Thornton. "Non-perturbative Yukawa couplings." Physics Letters B 212, no. 4 (October 1988): 479–82. http://dx.doi.org/10.1016/0370-2693(88)91800-x.

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CVETIČ, MIRJAM, and PAUL LANGACKER. "NEW GAUGE BOSONS FROM STRING MODELS." Modern Physics Letters A 11, no. 15 (May 20, 1996): 1247–62. http://dx.doi.org/10.1142/s0217732396001260.

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We address the mass ranges of new neutral gauge bosons and constraints on the accompanying exotic particles as predicted by a class of superstring models. Under certain assumptions about the supersymmetry breaking parameters we show that breaking of an additional U(1)′ symmetry is radiative when the appropriate Yukawa couplings of exotic particles are of order one, analogous to the radiative breaking of the electroweak symmetry in the supersymmetric standard model due to the large top-quark Yukawa coupling. Such large Yukawa couplings occur for a large class of string models. The Z′ and exotic masses are either of [Formula: see text], or of a scale intermediate between the string and electroweak scales. In the former case, [Formula: see text] may be achieved without excessive fine-tuning, and is within future experimental reach.

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Dissertations / Theses on the topic "Yukawa couplings"

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Ghilencea, Dumitru. "Unification predictions for supersymmetric extensions of the standard model." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284614.

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Liyanage, Christoph [Verfasser]. "Yukawa Couplings from D-branes on non-factorisable Tori / Christoph Liyanage." Bonn : Universitäts- und Landesbibliothek Bonn, 2018. http://d-nb.info/1167856961/34.

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Lanzagorta, Marco. "Infra-red fixed points in supersymmetric Grand Unified theories." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318836.

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Eyton-Williams, Oliver John. "Small Yukawa couplings in particle physics and cosmology from Type 1 string theory." Thesis, University of Southampton, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433940.

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Ciezarek, Gregory. "Searches for lepton number violation, and flavour violation beyond the Yukawa couplings at LHCb." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25052.

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The Standard Model does not describe several phenomena, such as gravity and dark matter, and therefore is an incomplete description of nature. This demands the existence of new physics beyond the Standard Model. Two searches for new physics are presented in this thesis, along with a sensitivity study for a third analysis sensitive to new physics. The vMSM model motivates a search for lepton number violation using B+ -> h- μ+ μ+ decays, where h = (pi, K). No B+ → h- μ+ μ+ candidates are seen in ~ 36 pb -1 of LHCb data and limits are set of BR (B+ → K- μ+ μ+) < 4.1 x 10 -8 and BR (B+ → pi- μ+ μ+) < 4.4 x 10 -8 at 90\% C.L. These improve the previous best limits by a factor 40 and 30, respectively. Using ~ 1fb -1 of LHCb data, the B+ → pi+ μ+ μ- decay is observed for the first time with 5.2 sigma significance. This is the first b → dμ+μ- transition to be observed. The B+→ pi+ μ+ μ- branching fraction is measured to be (2.3 ± 0.6 (stat) ± 0.1 (syst)) x 10 -8. The ratio of branching fractions between B+ → pi+ μ+ μ- and B+ → K- μ+ μ- is measured to be 0.053 ± 0.014 (stat) ± 0.001 (syst), and this is used to determine a value of the ratio of quark mixing matrix elements Vtd| /Vtd| = 0.266 ± 0.035 (stat) ± 0.003 (syst). All of these results are compatible with the Standard Model expectations. Previous measurements of the ratio of B → D(*)τ+v and B → D(*)μ+v branching fractions exceed the Standard Model expectations by more than 3 sigma, combining D and D*. These decays are challenging to measure at a hadron collider, due to the presence of neutrinos in the final state. A sensitivity study is presented for a measurement of the ratio of B0 → D*τ+v and B0 → D*-μ+v branching fractions at LHCb. This study includes a novel fit method, and two new algorithms which enable the backgrounds to be controlled, and control samples to be isolated. The estimated uncertainty on Rd*, including the largest systematic uncertainties, is ~ 8\%, competitive with the 9\% uncertainty on the present best measurement of Rd*.

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Nguyen, Khoa. "The Yukawa coupling in three dimensions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0009/NQ42547.pdf.

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Jeske, C. "Evidence for the Higgs boson Yukawa coupling to tau leptons with the ATLAS detector." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77753/.

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Bruscino, Nello [Verfasser]. "A gateway to new physics: direct measurement of the top Yukawa coupling to the Higgs boson / Nello Bruscino." Bonn : Universitäts- und Landesbibliothek Bonn, 2017. http://d-nb.info/1149154373/34.

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Tabassam, Hajrah. "Physics studies at a future linear collider." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/5858.

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With the start of the Large Hadron Collider(LHC) at CERN, we will obtain a new understanding of the physics beyond our current limits. New discoveries will be made; but we will require a deeper understanding, which the LHC machine, being a hadron collider, will not be able to elucidate. Instead, we will need an e+e- collider to make precision measurements of the newly discovered phenomena. Electroweak symmetry breaking and the origin of fermion and boson masses are fundamental issues in our understanding of particle physics. The essential piece of electroweak symmetry breaking - the Higgs boson - will probably be discovered at the LHC. If there are one, or more, Higgs boson(s) precise measurements of all properties of the Higgs will be very important. In this thesis I present two measurements of Standard Model Higgs boson properties in the context of the International Linear Collider (ILC) at √s = 500 GeV, using the proposed International Linear Detector (ILD). First a performance study of ILD to measure the branching ratios of the Higgs boson with mH = 120 GeV, where the Higgs boson is produced with a Z-boson via the Higgsstralung process, and the Z decays into e+e- or μ+μ-. It will also be essential to study the Higgs Yukawa coupling. Therefore, in the second part of this thesis, I present a study of e+e- → tt¯H with the aim of making a direct measurement of the the top-Higgs coupling, using the semi-leptonic nal state and mH of 120 GeV. I show that the top-Higgs coupling can be measured with an accuracy of better than 28%.

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Zhang, Huaqiao. "Analyse ttH,H->WW avec ATLAS au LHC et étude des électron à Très Basses énergie dans le Test Faisceau Combiné 2004." Phd thesis, Université de la Méditerranée - Aix-Marseille II, 2008. http://tel.archives-ouvertes.fr/tel-00443806.

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Utilisant des données Monte-Carlo ATLAS en simulation complète du canal ttH;H->WW(*), cette thèse prsésente une étude de la mesure du couplage de Yukawa du quark top pour une lumisosité intégrée de 30fb(-1) dans la gamme de masses du Higgs allant de 120 à 200GeV. Les effets du système de déclenchement, de l'empilement des événements, ainsi que de toutes les erreures systématiques possibles ont été étudiés. Pour une masses du Higgs de 160GeV, en incluant les erreures systématiques, la significance obtenue du signal est à 2 sigma en combinant les états finaux à deux et trois leptons. Le rapport d'embranchement combiné sigma_ttH*Br(H->WW(*)) peut atteindre une précision de 47 %.Cette thèse comprend également une étude de la linéarité de la réponse à des électrons VLE avec des données de tests en faisceau combiné d'un secteur du détecteur ATLAS. Les résultats MC utilisant une graine multiple 5X5 permettent d'envisager une amélioration future de la linéarité de réponse à des électron VLE.

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Books on the topic "Yukawa couplings"

1

Pierre, Ramond, ed. Yukawa couplings and the origins of mass. Cambridge, MA: International Press, 1996.

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Book chapters on the topic "Yukawa couplings"

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Cox, David, and Sheldon Katz. "Hodge theory and Yukawa couplings." In Mathematical Surveys and Monographs, 73–112. Providence, Rhode Island: American Mathematical Society, 1999. http://dx.doi.org/10.1090/surv/068/05.

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Barger, V., M. S. Berger, R. J. N. Phillips, and T. Wöhrmann. "R-parity-violating Yukawa couplings." In Neutrino Mass, Dark Matter, Gravitational Waves, Monopole Condensation, and Light Cone Quantization, 19–29. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4899-1564-1_3.

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Candelas, P. "Yukawa Couplings Between (2, 1)-Forms." In Super Field Theories, 321–65. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-0913-0_14.

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González, H., S. R. Juárez W., P. Kielanowski, and G. López Castro. "A New Symmetry of Quark-Yukawa Couplings." In International Europhysics Conference on High Energy Physics, 755–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-59982-8_126.

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Yue, Jason Tsz Shing. "Probing $$\mathcal {CP}$$ -violating Top-Yukawa Couplings at the LHC." In Higgs Properties at the LHC, 41–73. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63402-9_3.

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Saito, Masa-Hiko. "Prepotentials of Yukawa Couplings of Certain Calabi-Yau 3-Folds and Mirror Symmetry." In The Arithmetic and Geometry of Algebraic Cycles, 385–425. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4098-0_14.

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Ioannidou, Theodora, and John Morris. "Yukawa Coupling." In Concise Encyclopedia of Supersymmetry, 514. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/1-4020-4522-0_698.

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Kawarabayashi, Ken. "YUKAWA COUPLINGS AND THE NATURE OF ZERO MODES IN THE SKYRME MODEL." In Perspectives on Particle Physics, 167–76. WORLD SCIENTIFIC, 1989. http://dx.doi.org/10.1142/9789814434133_0014.

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Zinn-Justin, Jean. "Gross–Neveu–Yukawa and Gross–Neveu models." In Quantum Field Theory and Critical Phenomena, 489–506. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198834625.003.0020.

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In this chapter, a model is considered that can be defined in continuous dimensions, the Gross– Neveu–Yukawa (GNY) model, which involves N Dirac fermions and one scalar field. The model has a continuous U(N) symmetry, and a discrete symmetry, which prevents the addition of a fermion mass term to the action. For a specific value of a coefficient of the action, the model undergoes a continuous phase transition. The broken phase illustrates a mechanism of spontaneous symmetry breaking, leading to spontaneous fermion mass generation like in the Standard Model (SM) of particle physics. In four dimensions, the GNY can be considered as a toy model to represent the interactions between the top quark and the Higgs boson, the heaviest particles of the SM of fundamental interactions, when the gauge fields are omitted. The model is renormalizable in four dimensions and its renormalization group (RG) properties can be studied in d = 4 and d = 4 − ϵ dimensions. A model of self-interacting fermions with the same symmetries and fermion content, the Gross–Neveu (GN) model, has been widely studied. In perturbation theory, for d > 2, it describes only a phase with massless fermions but, in d = 2 + ϵ dimensions, the RG indicates that, at a critical value of the coupling constant, the model experiences a phase transition. In two dimensions, it is renormalizable and exhibits the phenomenon of asymptotic freedom. The massless phase becomes infrared unstable and there is strong evidence that the spectrum corresponds to spontaneous symmetry breaking and fermion mass generation.

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Conference papers on the topic "Yukawa couplings"

1

Candelas, P. "Yukawa Couplings Between (2,1)–Forms." In Proceedings of the Conference on Mathematical Aspects of String Theory. WORLD SCIENTIFIC, 1987. http://dx.doi.org/10.1142/9789812798411_0025.

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Anastasopoulos, Pascal, Massimo Bianchi, and Dario Consoli. "Yukawa couplings for light stringy states." In The European Physical Society Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.314.0538.

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LEBEDEV, OLEG. "HETEROTIC YUKAWA COUPLINGS AND WILSON LINES." In Proceedings of the 2nd International Conference. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702463_0033.

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Dawson, S. "Top quark Yukawa couplings and new physics." In Physics and experiments with future linear e+ e- colliders. AIP, 2001. http://dx.doi.org/10.1063/1.1394318.

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Gomez, M. "Yukawa couplings and proton decay in SUSY models." In European Network on Physics beyond the Standard Model. Trieste, Italy: Sissa Medialab, 1999. http://dx.doi.org/10.22323/1.002.0006.

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Alasfar, Lina, and Ramona Gröber. "Probing light Yukawa couplings in Higgs pair production." In European Physical Society Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.364.0343.

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Di Croce, Davide. "Measurements of the Higgs Boson Yukawa Couplings in CMS." In Workshop on Heavy Particles and Flavours. WORLD SCIENTIFIC, 2019. http://dx.doi.org/10.1142/9789811200380_0004.

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Higuchi, Katsuichi, and Katsuji Yamamoto. "Aspect of Fermion Mass Hierarchy within Flavor Democracy for Yukawa Couplings." In Proceedings of the 12th Asia Pacific Physics Conference (APPC12). Journal of the Physical Society of Japan, 2014. http://dx.doi.org/10.7566/jpscp.1.013011.

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KOBAYASHI, TATSUO. "VIABLE SUSY MODELS FOR DEGENERATE SFERMION MASSES AND HIERARCHICAL YUKAWA COUPLINGS." In Proceedings of the IX International Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812778192_0037.

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González, H., S. R. Juárez W., P. Kielanowski, and G. López Castro. "Renormalization group equations for a certain class of quark-Yukawa couplings." In First Latin American symposium on high energy physics and The VII Mexican School of Particles and Fields. AIP, 1997. http://dx.doi.org/10.1063/1.53221.

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Reports on the topic "Yukawa couplings"

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Farzan, Y. The Contribution from Neutrino Yukawa Couplings to Lepton Electric Dipole Moments. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/826926.

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