Download or read book Test of Lepton Universality in Upsilon 1S Decays at BaBar written by and published by . This book was released on 2010 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ratio R{sub??}(?(1S))=?{sub?(1S)→??−}/?{sub?(1S)→?+?−} is measured using a sample of (121.8 ± 1.2) x 106?(3S) events recorded by the BABAR detector. This measurement is intended as a test of lepton universality and as a search for a possible light pseudoscalar Higgs boson. In the standard model (SM) this ratio is expected to be close to 1. Any significant deviations would violate lepton universality and could be introduced by the coupling to a light pseudoscalar Higgs boson. The analysis studies the decays?(3S) →?(1S){sub?+{pi}−}, {Upsilon}(1S) → l+l−, where l =?, {tau}. The result, R{sub {tau}?}({Upsilon}(1S))=1.005 ± 0.013(stat) ± 0.022(syst), shows no deviation from the expected SM value, while improving the precision with respect to previous measurements.
Download or read book Lepton Universality Test in Upsilon 1S Decays at BaBar written by and published by . This book was released on 2012 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a sample of 122 million?(3S) decays collected with the BABAR detector at the PEP-II asymmetric energy collider at the SLAC National Accelerator Laboratory, we measure the ratio R{sub??} = BR(?(1S) →??−)/BR(?(1S) →?+?−); the measurement is intended as a test of lepton universality and as a possible search for a light pseudoscalar Higgs boson in Next to Minimal Supersymmetric Standard Model (NMSSM) scenarios. Such a boson could appear in a deviation of the ratio R{sub {tau}?} from the Standard Model expectation, that is 1, except for small lepton mass corrections. The analysis exploits the decays?(3S) →?(1S)?+?−,?(1S) → l+l−, where l =?, {tau}.
Download or read book Search for Invisible Decays of the Upsilon 1S Meson at BABAR written by Lucas O. Winstrom and published by . This book was released on 2009 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Test of Lepton Universality with 0b pK l l Decays written by Roel Aaij and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Test of Lepton Universality and Searches for Lepton Flavor Violation at BaBar written by and published by . This book was released on 2013 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Testing Lepton Universality Using One prong Hadronic Tau Decays written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Measurement of sigma pp W Br W tau Upsilon and a Test of Lepton Universality at square Root s 1 8 Te V written by Hailin Li and published by . This book was released on 1996 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Charged Lepton Violation in Narrow Upsilon Decays written by and published by . This book was released on 2011 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Charged lepton flavor violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99 x 106 [Upsilon](2S) decays and 117 x 106 [Upsilon](3S) decays collected with the BABAR detector. We place upper limits on the branching fractions [Beta]([Upsilon](nS) → e{sup {+-}}[tau]{sup {-+}}) and [Beta]([Upsilon](nS) → [mu]{sup {+-}}[tau]{sup {-+}}) (n = 2, 3) at the 10−6 level and use these results to place lower limits of order 1 TeV on the mass scale of charged lepton flavor violating effective operators.
Download or read book B Decays written by Sheldon Stone and published by World Scientific. This book was released on 1994 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2nd edition is an extensive update of "B Decays?. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of ?Penguin? mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the ?Standard Model? and how further tests can be done using measurements of CP violation in the B system.
Download or read book Decays of the Upsilon 1S Into a Photon and Two Charged Hadrons written by Luis Breva-Newell and published by . This book was released on 2004 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 16th Conference on Flavor Physics and CP Violation written by Anjan Giri and published by Springer Nature. This book was released on 2019-11-13 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting the proceedings of FPCP 2018, this book reviews the status quo of flavor physics and discusses the latest findings in this exciting area. Flavor physics has been instrumental in the formulation and understanding of the standard model, and it is possible that the direction of new physics will be significantly influenced by flavor sector, also known as the intensity frontier, making it possible to indirectly test the existence of new physics up to a very high scale, beyond that of the energy frontier scale accessible at the LHC. The book is intended for academics around the globe involved in particle physics research, professionals associated with the related technologies and those who are interested in learning about the future of physics and its prospects and directions.
Download or read book Particles and Nuclei written by Bogdan Povh and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fourth edition includes new developments, in particular a new section on the double beta decay including a discussion of the possibility of a neutrinoless decay and its implications for the standard model.
Download or read book The Standard Model written by Cliff Burgess and published by Cambridge University Press. This book was released on 2007 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2006 book uses the standard model as a vehicle for introducing quantum field theory.
Download or read book The Anomalous Magnetic Moment of the Muon written by Fred Jegerlehner and published by Springer Science & Business Media. This book was released on 2008 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the present state of knowledge of the anomalous magnetic moment a=(g-2)/2 of the muon. The muon anomalous magnetic moment is one of the most precisely measured quantities in elementary particle physics and provides one of the most stringent tests of relativistic quantum field theory as a fundamental theoretical framework. It allows for an extremely precise check of the standard model of elementary particles and of its limitations.
Download or read book Modern Particle Physics written by Mark Thomson and published by . This book was released on 2013 with total page 825 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Unique in its coverage of all aspects of modern particle physics, this textbook provides a clear connection between the theory and recent experimental results, including the discovery of the Higgs boson at CERN. It provides a comprehensive and self-contained description of the Standard Model of particle physics suitable for upper-level undergraduate students and graduate students studying experimental particle physics. Physical theory is introduced in a straightforward manner with full mathematical derivations throughout. Fully-worked examples enable students to link the mathematical theory to results from modern particle physics experiments. End-of-chapter exercises, graded by difficulty, provide students with a deeper understanding of the subject. Online resources available at www.cambridge.org/MPP feature password-protected fully-worked solutions to problems for instructors, numerical solutions and hints to the problems for students and PowerPoint slides and JPEGs of figures from the book"--
Download or read book Particle Physics written by Brian R. Martin and published by John Wiley & Sons. This book was released on 2013-03-22 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential introduction to particle physics, with coverage ranging from the basics through to the very latest developments, in an accessible and carefully structured text. Particle Physics: Third Edition is a revision of a highly regarded introduction to particle physics. In its two previous editions this book has proved to be an accessible and balanced introduction to modern particle physics, suitable for those students needed a more comprehensive introduction to the subject than provided by the ‘compendium’ style physics books. In the Third Edition the standard model of particle physics is carefully developed whilst unnecessary mathematical formalism is avoided where possible. Emphasis is placed on the interpretation of experimental data in terms of the basic properties of quarks and leptons. One of the major developments of the past decade has been the establishing of the existence of neutrino oscillations. This will have a profound effect on the plans of experimentalists. This latest edition brings the text fully up-to-date, and includes new sections on neutrino physics, as well as expanded coverage of detectors, such as the LHC detector. End of chapter problems with a full set of hints for their solutions provided at the end of the book. An accessible and carefully structured introduction to this demanding subject. Includes more advanced material in optional ‘starred’ sections. Coverage of the foundations of the subject, as well as the very latest developments.
Download or read book Understanding the Universe written by Don Lincoln and published by World Scientific. This book was released on 2012 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explains the fascinating world of quarks and leptons and the forces that govern their behavior. Told from an experimental physicist's perspective, it forgoes mathematical complexity, using instead particularly accessible figures and apt analogies. In addition to the story of quarks and leptons, which are regarded as well-accepted fact, the author (who is a leading researcher at one of the world's highest energy particle physics laboratories) also discusses mysteries at both the experimental and theoretical frontiers, before tying it all together with the exciting field of cosmology and indeed the birth of the universe itself.
