Two And Three Body Charmless B Decays At Babar

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Two And Three Body Charmless B Decays At Babar

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Author :
language : en
Publisher:
Release Date : 2012

Two And Three Body Charmless B Decays At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.

We report recent measurements of rare charmless B decays performed by BaBar. The results are based on the final BaBar dataset of 424 fb−1 collected at the PEP-II B-factory based at the SLAC National Accelerator Laboratory. The study of rare B decays is a key ingredient to meet two of the main goals of the B-factories: assessing the validity of the Cabibbo-Kobayashi-Maskawa (CKM) picture of CP-violation by precisely measuring the elements of the Unitarity Triangle (UT), and searching for hints of New Physics (NP), or otherwise constraining NP scenarios, in processes which are suppressed in the Standard Model (SM). In loop processes, in particular, NP at some higher energy scale may manifest itself in the low energy effective theory as new couplings, such as those introduced by new very massive virtual particles in the loop. In NP searches hadronic uncertainties can play a major role, expecially for branching fraction measurements. Many theoretical uncertainties cancel in ratios of amplitudes, and most NP probes are therefore of this kind. In the following sections we report recent measurements, performed by the BaBar Collaboration, that are relevant to NP searches in charmless hadronic B decays.

Fach Und Fortbildungstagung Der Fachklasse Konservierung Und Restaurierung Schule F R Gestaltung Bern

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Author :
language : en
Publisher:
Release Date : 1983

Fach Und Fortbildungstagung Der Fachklasse Konservierung Und Restaurierung Schule F R Gestaltung Bern written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.

Measurements Of Charmless Three Body And Quasi Two Body B Decays

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Author :
language : en
Publisher:
Release Date : 2000

Measurements Of Charmless Three Body And Quasi Two Body B Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

The authors present preliminary results of a search for several exclusive charmless hadronic B decays from electron-positron annihilation data collected by the BaBar detector near the Upsilon(4S) resonance. These include three-body decay modes with final states h"h{sup minus-plus}h" and h"h{sup minus-plus}pi°, and quasi-two-body decay modes with final states X°h and X°K{sub S}°, where h = pi or K and X° = eta-prime or omega. They find beta(B° --> rho{sup minus-plus}pi{sup "}) = (49"135{sup +6}) x 10−6 and beta(B --> eta-prime-K+) = (62"18{+-}8) x 10−6 and present upper limits for right other decays.

Charmless 2 And 3 Body B Decays And The Angle Alpha Phi 2

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Author : M. Cristinziani
language : en
Publisher:
Release Date : 2004

Charmless 2 And 3 Body B Decays And The Angle Alpha Phi 2 written by M. Cristinziani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

We present preliminary measurements of branching fractions and CP-asymmetry parameters in two- and three-body charmless hadronic B decays. The available data sample consists of 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. We establish the observation of the decays B{sup 0} {yields} {pi}{sup 0}{pi}{sup 0} and B{sup 0} {yields} K{sup 0}{bar K}{sup 0} and constrain the CKM angle {alpha} with a full SU(2) isospin analysis in the B {yields} {pi}{pi} system and with a B{sup 0} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0} time-dependent Dalitz plot analysis.

Babar

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Author : D. Hutchcroft
language : en
Publisher:
Release Date : 2006

Babar written by D. Hutchcroft and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

Three two body and two resonance decays of the B mesons have been measured using data from the BABAR detector: B{sup 0} {yields} {pi}{sup {+-}}, K{sup {-+}}, K{sup +}K{sup -}, K{sub S}{sup 0}{pi}{sup +}{pi}{sup -} and B{sup 0} {yields} a{sub 1}{sup +}(1260){pi}{sup -}. The branching ratio and that of some intermediate resonances are presented along with the Cp asymmetry of the decay B{sup 0} {yields} K*{sup +}{pi}{sup -}.

Charmless Hadronic B Decays At Babar

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Author :
language : en
Publisher:
Release Date : 2001

Charmless Hadronic B Decays At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

We present several searches for charmless hadronic two-body and three-body decays of B mesons from electron-positron annihilation data collected by the BABAR detector near the?(4S) resonance. We report the preliminary branching fractions?(B° →??−) = (4.1 ± 1.0 ± 0.7) x 10−6,?(B° → K+?−) = (16.7 ± 1.6 ± 1.3) x 10−6,?(B° →?{sup -+}?{sup -+}) = (49 ± 13−5{sup +6}) x 10−6,?(B+ →?' K+) = (62 ± 18 ± 8) x 10−6, and present upper limits for nine other decays.

Studies Of Cp Violation In Charmless Three Body B Hadron Decays

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Author : Daniel O'Hanlon
language : en
Publisher: Springer
Release Date : 2018-11-02

Studies Of Cp Violation In Charmless Three Body B Hadron Decays written by Daniel O'Hanlon and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-02 with Science categories.

This book highlights two essential analyses of data collected during the LHCb experiment, based on the Large Hadron Collider at CERN. The first comprises the first observation and studies of matter-antimatter asymmetries in two three-body b-baryon decays, paving the way for more precise measurements of the relatively unknown decay properties of b-baryon decays. The second is an analysis of a charged B meson decay to three charged pions, where previously large matter-antimatter asymmetries were observed in a model-independent analysis. Here a model of the decay amplitude is constructed using the unitarity-conserving ‘K-matrix’ model for the scalar contributions, so as to gain an understanding of how the previously observed matter-antimatter asymmetries arise; further, the model’s construction yields the most precise and comprehensive study of this decay mode to date.

Time Dependent Cp Asymmetries And Branching Ratiomeasurements In Charmless Three Body B Decays At Babar

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Author :
language : en
Publisher:
Release Date : 2007

Time Dependent Cp Asymmetries And Branching Ratiomeasurements In Charmless Three Body B Decays At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

In this work we presented measurements of CP violation and decay rates of B decays in final states not involving a charm quark in the final state. In particular, the time-dependent CP asymmetries of decays which proceed through b 2!s elementary transition is a particularly sensitive probe of physics beyond the Standard Model. In fact, even if the precise measurements of CP conserving and CP violating processes show the success of the CKM picture of the flavour physics, the sector of b 2!s transitions is still not strongly constrained and leaves room for new physics contributions. In particular, we considered the decays which have the cleanest theoretical prediction within the Standard Model: B° 2![phi]K° and B° 2!K{sub s}°K{sub s}°K{sub s}° [beta]{sub eff}{sup SM} = 0.379. We examined the former with a completely new approach with respect to the past: the study of CP violation in the whole KK−K° phase space through a time-dependent Dalitz plot analysis. With this approach, we simultaneously measured the CP-violating asymmetries of the [phi]KJ°, f0(980)K° resonant and KK−K° non-resonant contributions, avoiding one of the largest uncertainties which affected the previous measurements of B° 2![phi]K°. We find [beta]{sub eff}(B° 2![phi]K°) = 0.06 ± 0.16 ± 0.05, which is lower than the Standard Model expectation, but it is consistent with it within two standard deviations. Moreover, only a recently developed experimental technique, which allows the determination of the position of B decay vertex when no charged tracks are originating from it, has made possible the measurement of the time-dependent CP asymmetry in B° 2!K{sub s}°K{sub s}°K{sub s}° decays. The mixing-induced CP parameter S in the Standard Model should be equal to sin 2[beta] parameter, which is measured with high precision in B 2![c{bar c}]K° decays by the B-factories. This statement is true, in the Standard Model, with excellent approximation for the decays studied in this work. The summary of the measurements in the b 2!s sector is shown in Fig. 9.8 A naive average of the b 2!s penguins, which does not account for the correlations existing among [phi]K°, f0(980)K° and K+K−K°, and that includes also modes with larger theoretical uncertainties, shows that -[eta]{sub CP} x S is lower than sin 2[beta]. This is not an evidence of physics beyond the Standard Model, but the systematic deviation from the expected value is an hint that there is room for it. More compelling evidence for new physics could be obtained measuring significant deviation in each decay channel from Standard Model prediction. Currently all the measurement are statistically limited and therefore an increase in accumulated statistics will shed more light into this quest for New Physics.

High Energy Physics

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Author : Hesheng Chen
language : en
Publisher: World Scientific
Release Date : 2005-05-03

High Energy Physics written by Hesheng Chen and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-05-03 with Science categories.

The 32nd International Conference on High Energy Physics belongs to the Rochester Conference Series, and is the most important international conference in 2004 on high energy physics. The proceedings provide a comprehensive review on the recent developments in experimental and theoretical particle physics. The latest results on Top, Higgs search, CP violation, neutrino mixing, pentaquarks, heavy quark mesons and baryons, search for new particles and new phenomena, String theory, Extra dimension, Black hole and Lattice calculation are discussed extensively. The topics covered include not only those of main interest to the high energy physics community, but also recent research and future plans. Contents: Neutrino Masses and MixingsQuark Matter and Heavy Ion CollisionsParticle Astrophysics and CosmologyElectroweak PhysicsQCD Hard InteractionsQCD Soft InteractionsComputational Quantum Field TheoryCP Violation, Rare Kaon Decay and CKMR&D for Future Accelerator and DetectorHadron Spectroscopy and ExoticsHeavy Quark Mesons and BaryonsBeyond the Standard ModelString Theory Readership: Experimental and theoretical physicists and graduate students in the fields of particle physics, nuclear physics, astrophysics and cosmology.Keywords:High Energy Physics;Particle Physics;Electroweak;QCD;Heavy Quark;Neutrino;Particle Astrophysics;Hadron Spectroscopy;CP Violation;Quark Matter;Future Accelerator

Few Body Problems In Physics Proceedings Of The 3rd Asia Pacific Conference

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Author : Yupeng Yan
language : en
Publisher: World Scientific
Release Date : 2007-01-29

Few Body Problems In Physics Proceedings Of The 3rd Asia Pacific Conference written by Yupeng Yan and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-01-29 with Science categories.

The Asia-Pacific Conferences on Few-Body Problems in Physics tackle cover the various aspects of few-body systems in physics, with high caliber contributions from internationally renowned researchers. Readers will gain a clear picture of the latest developments in the field in both the theoretical and experimental sectors.The scope of these proceedings covers research in the following areas: three-body forces and few-nucleon dynamics, hadron structure and QCD; exotic hadrons and atoms; effective field theory in few-body physics; electromagnetic and weak processes in few-body systems; few-body dynamics in atoms, molecules, Bose-Einstein condensates and quantum dots; few-body approaches to unstable nuclei, nuclear astrophysics and nuclear clustering aspects; and hypernuclear physics.