Precision Measurement of the Mass Difference of Neutral and Charged B Mesons PDF Download
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Author: René Nogowski
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: René Nogowski
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
This work presents a precision determination of the mass difference of neutral and charged B mesons, m(B0) - m(B+). The measurement is based on a data sample of about 232 million B-meson pairs recorded with the BABAR detector at the e+e- storage-ring system PEP-II. In events of e+e- --> Upsilon(4S) --> B Bbar, B0 and B+ mesons are fully reconstructed in decays B+ --> J/psi K+ and B0 --> J/psi K*0 using the subsequent decays J/psi --> l+ l- and K*0 --> K+ pi- for the reconstruction of J/psi mesons and K*0 resonances, respectively. The determination of the mass difference from the measurement of the invariant B-meson masses suffers from detector-resolution effects. To reach the desired sensitivity, the B-meson momenta are measured in the center-of-mass system, the Upsilon(4S) rest frame. Since their energy is also known in the center-of-mass system, this method leads to the mass difference using the relativistic energy-momentum relation. For this purpose, three different fit methods are performed to the spectra of the B momenta. The obtained result is m(B0) - m(B+) = (+0.33 +- 0.05 +- 0.03) MeV/c^2, where the first error is statistical and the second estimates the systematic uncertainty of this measurement, which agrees well with the current world average. However, the combined error of this measurement is substantially smaller than that in the current world average, and the significance of m(B0) - m(B+) being non-zero has exceeded the 5 sigma level.
Author: René Nogowski
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
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Author: Sheldon Stone
Publisher: World Scientific
ISBN: 9789810218362
Category : Science
Languages : en
Pages : 676
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Book Description
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.
Author: Persis S. Drell
Publisher:
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 506
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Author: C.T.H Davies
Publisher: CRC Press
ISBN: 9781420034165
Category : Science
Languages : en
Pages : 414
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Book Description
This book provides a thorough introduction to the phenomenology of heavy flavour physics, those working on the B-factories, LHCb, BTeV, HERA and the Tevatron. It explains how heavy quark theory could be implemented on the lattice, and discusses the status of CP-violation in the neutral kaon system.
Author: Krzysztof Rybicki
Publisher: World Scientific
ISBN: 9814548057
Category :
Languages : en
Pages : 539
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Book Description
This book presents a comprehensive overview of high energy physics. It covers the whole range of results from the colliders and fixed-target experiments as well as the astrophysics topics related to particle physics. Also discussed are the problems of proton structure, electroweak physics, non-perturbative QCD and heavy quarks.
Author: David K. Clark
Publisher:
ISBN:
Category : Lepton-hadron interactions
Languages : en
Pages : 93
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![Measurement of the Hadronic Mass Spectrum in B[right Arrow]X[subscript U]l[nu] Decays and Determination of the B-quark Mass at the BABAR Experiment PDF](https://books.google.com/books/content/images/frontcover/CmZOAQAAMAAJ?fife=w80-h100)
Author: Kerstin Tackmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 300
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Author: J. Thanh Van Tran
Publisher: Atlantica Séguier Frontières
ISBN: 9782863320310
Category : CP violation (Nuclear physics)
Languages : en
Pages : 508
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