Search for CP Violation in Tau Lepton Decays PDF Download

Author: Yurii Maravin
Publisher:
ISBN:
Category : Great Britain
Languages : en
Pages : 272

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Author:
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ISBN:
Category :
Languages : en
Pages :

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Author: Hervé Hiu Fai Choi
Publisher:
ISBN:
Category :
Languages : en
Pages :

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According to the Big Bang Theory, matter and antimatter were produced in equal amounts at the beginning. Over time the antimatter disappeared, leaving galactic struc- tures composed only of matter. Therefore, there is some process in nature that proceeds at different rates for matter and antimatter due to the violation of the CP symmetry. CP violation has been observed in strange and bottom quark meson decays. However, a direct CP violation is predicted in the? lepton sector. Specifically, the charge asymmetry due to CP violation in the decay?????K0S (? 0?0)?? is predicted to be (+0.33 ± 0.01)%. In this work the charge asymmetry of the decay?????K0S (? 0?0) v? is measured using a dataset of 437 million? lepton pairs collected by the BABAR experiment at the SLAC National Accelerator Laboratory. The charge asymmetry induced by CP violation is found to be A = ( -0.45 ± 0.24 ± 0.11) %, consistent with prediction.

Author: Cecilia Jarlskog
Publisher: World Scientific
ISBN: 9814632457
Category :
Languages : en
Pages : 733

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Contents:CP Phenomenology:Introduction to CP Violation (C Jarlskog)CP-Violation in the K0-K0-System (K Kleinknecht)The Quark Mixing Matrix, Charm Decays and B Decays (S Stone)The Question of CP Noninvariance — As Seen through the Eyes of Neutral Beauty (I I Bigi et al.)In Search of CP Noninvariance in Heavy Quark Systems (L-L Chau)CP Violation at High Energy e+e- Colliders (J Bernabéu & M B Gavela)CP Violation in the Standard Model with Four Families (A Datta & E A Paschos)CP Effects When Neutrinos are their Own Antiparticles (B Kayser)On Spontaneous CP Violation Triggered by Scalar Bosons (I I Bigi & A I Sanda)CP Violation and Left-Right Symmetry (R N Mohapatra)CP Violation and Supersymmetry (R N Mohapatra)Electric Dipole Moments (S M Barr & W H Marciano)Special Topics: The Strong CP Problem (R D Peccei)CP Violation and Cosmology (P Langacker)Nonleptonic Interactions:The 1/N Approach to Nonleptonic Weak Interactions (A J Buras)Chiral Perturbation Theory Approach to Weak Amplitudes (E de Rafael)What We Learnt from Weak Decays of Heavy Quarks (B Stech)Weak Hamiltonian on the Lattice (G Martinelli) Readership: High energy physicists. Keywords:CP Violation;Quark Mixing Matrix;Charm Decays;B Decays;Nonleptic Interactions;Heavy QuarksReview: “Similar material is most often available in journals, but the book accomplishes a valuable service in drawing it together … the one that will probably have the greatest utility and longest lifespan is the survey of B meson physics by I Bigi, V Khoze, N Uraltsev and A Sanda … Bigi et al. here provide the most thorough and readable account of the issues that I know of. I have seen no review comparable to the excellent summary of electric dipole moments by S Barr and W Marciano … the volume offers a generally readable entry into this field for a reader who has a basic background in particle physics.” John F Donoghue Science “… this book performs a very useful service for anyone active or interested in CP violation, both as a source of primary information and as a work of reference.” K J Peach J Phys. G: Nucl. Part. Phys.

Author:
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ISBN:
Category :
Languages : en
Pages : 7

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We report a search for CP violation in the decay?− →?−K{sub S}°({>=} 0?°)?{sub?} using a dataset of 437 million {tau} lepton pairs, corresponding to an integrated luminosity of 476 fb−1, collected with the BABAR detector at the PEP-II asymmetric energy ee− storage rings. The CP-violating decay-rate asymmetry is determined to be ( -0.45 ± 0.24 ± 0.11)%, approximately three standard deviations from the Standard Model prediction of (0.33 ± 0.01)%.

Author:
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Category :
Languages : en
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If CP is violated in any decay process involving leptons it will signify the existence of a new scalar boson (called the X boson) responsible for CP violation that may be the key to understanding matter-antimatter asymmetry in the universe. The authors discuss the signatures of CP violation in (1) the decay of tau and mu leptons, and (2) the semileptonic decay of[pi], K, D, B and t particles by measuring the polarization of the charged lepton in the decay. The authors discuss how the coupling constants and their phases of the coupling of the X boson to 9 quark vertices and 3 lepton vertices can be obtained through 12 decay processes.

Author: BELLE
Publisher:
ISBN:
Category :
Languages : en
Pages : 12

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 13

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In the Standard Model no CP violation can occur in decay processes involving leptons either as a parent or a daughter because these processes involve one W exchange and thus, even if the CP violating complex coupling exists in these decays, its effect will not show up when the amplitude is squared. The author needs two diagrams to interfere with each other to see the CP violating effects. Here, he discusses ways to find CP violation in the decay of [tau]{sup {+-}} → [nu]{sub [tau]} + 3[pi] from unpolarized as well as polarized {tau}{sup {+-}}.

Author: Hamish Gordon
Publisher: Springer
ISBN: 3319070673
Category : Science
Languages : en
Pages : 167

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Our current understanding of the fundamental building blocks of the Universe, summarised by the Standard Model of particle physics, is incomplete. For example, it fails to explain why we do not see equal, or almost equal, numbers of particles and their antiparticle partners. To explain this asymmetry requires, among other effects, a mechanism known as charge-parity (CP) violation that causes differences between the rates at which particles and antiparticles decay. CP violation is seen in systems containing bottom and strange quarks, but not in those with up, charm or top quarks. This thesis describes searches for particle-antiparticle asymmetries in the decay rates of charmed mesons. No evidence of CP violation is found. With current sensitivities, an asymmetry large enough to observe probably could not be explained by the Standard Model. Instead an explanation could come from new physics, for example contributions from supersymmetric or other undiscovered heavy particles. In the thesis, the development of new techniques to search for these asymmetries is described. They are applied to data from the LHCb experiment at CERN to make precise measurements of asymmetries in the D^+->K^-K^+pi^+ decay channel. This is the most promising charged D decay for CP violation searches.

Author: T Ohshima
Publisher: World Scientific
ISBN: 9814490776
Category : Science
Languages : en
Pages : 392

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This book offers the first strong evidence of the existence of CP violation in neutral B decays extracted from sophisticated B factories in the US and Japan. It also holds out the expectation of rare B decays and D, K physics in the near future. In addition, new physics beyond the Standard Model is described. Both experimental and theoretical points of view are given.