Author: Woochun ParkPublisher:
ISBN:
Category :
Languages : en
Pages : 314
Book Description
Probing for New Physics in B Meson Decays with Dilepton Events
Author: Woochun ParkNon-leptonic B Meson Decays as a Probe of New Physics
Author: Martin JungThe Experimental Foundations of Particle Physics
Author: Robert N. CahnPublisher: Cambridge University Press
ISBN: 113947992X
Category : Science
Languages : en
Pages : 567
Book Description
Our current understanding of elementary particles and their interactions emerged from break-through experiments. This book presents these experiments, beginning with the discoveries of the neutron and positron, and following them through mesons, strange particles, antiparticles, and quarks and gluons. This second edition contains new chapters on the W and Z bosons, the top quark, B-meson mixing and CP violation, and neutrino oscillations. This book provides an insight into particle physics for researchers, advanced undergraduate and graduate students. Throughout the book, the fundamental equations required to understand the experiments are derived clearly and simply. Each chapter is accompanied by reprinted articles and a collection of problems with a broad range of difficulty.
Searching for New Physics in B Meson Decays
Author: DeNiverville PatrickPublisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 92
Book Description
Physics Letters
Author: Probing New Physics in Rare B and Z0 Decays
Author: Jick Hyun KimRadiative B Meson Decay as a Probe of Physics Beyond the Standard Model
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 158
Book Description
The author presents measurements of radiative B meson decays to the final states Ks0?0? and K?? based on data collected at the ?(4S) resonance with the BABAR detector at the PEP-II e+e- collider at SLAC. In a data sample of 467 million B$ar{B}$ pairs, the time-dependent CP asymmetry in B0 → Ks0?0? decays is measured in two regions of Ks0-?0 invariant mass. In the K* region, 0.8 m(Ksubs/subsup0/sup?sup0/sup) 1.0 GeV/csup2/sup, we find SsubK*?/sub = -0.03 ± 0.29 ± 0.03 and CsubK*?/sub = -0.14 ± 0.16 ± 0.03; in the range 1.1 m(Ksubs/subsup0/sup?sup0/sup) 1.8 GeV/csup2/sup, they find SsubKsubs/subsup0/sup/sub?sup0/sup? = -0.78 ± 0.59 ± 0.09 and C subKsubs/subsup0/sup/sub?sup0/sup? = -0.36 ± 0.33 ± 0.04. With a sample of 228 million B$ar{B}$ pairs they measure the branching fraction ?(Bsup+/sup → Ksup+/sup??) = (3.5 ± 0.6 ± 0.4) x 10sup-6/sup and set the limit ?(Bsup0/sup→ Ksup0/sup??) 2.7 x 10sup-6/sup at 90% confidence level. The direct CP asymmetry in Bsup+
Radiative Decays of the B Meson
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The radiative decays of the B meson to the final states K*(892)[gamma] and[rho](770)[gamma] proceed through virtual effective flavor-changing neutral current processes which are sensitive to contributions from high mass scales from within the Standard Model of particle interactions and from possible new physics. In the context of the Standard Model, these transitions are of interest in probing the weak interaction behavior of the top quark. In particular, the ratio of branching fractions for the two processes can be used to extract the ratio of Cabibbo-Kobayashi-Maskawa matrix elementsV[sub td]/V[sub ts]. Potential new physics contributions in these virtual transitions may induce new sources of direct CP violation and enhancement or suppression of the rate of these processes. The B[yields] K*[gamma] is a manifestation of the b[yields] s[gamma] radiative transition. This process has been previously observed by the CLEO collaboration and its branching fraction measured. While the theoretical prediction for the inclusive rate of b[yields] s[gamma] transitions is more robust than that of the exclusive B[yields] K*[gamma], the prospects for precise measurements of[Beta][B[yields] K*[gamma]] and direct CP violation in this channel has attracted considerable attention. The analysis described here represents an improved measurement of the B[yields] K*[gamma] branching factions and a more sensitive search for direct CP violation. In 22.7 x 10[sup 6] B[bar B] events collected by the BABAR detector in 1999-2000, we measure:[Beta][B[sup 0][yields] K*[sup 0][gamma]]= 4.23[+-] 0.40(stat.)[+-] 0.22(syst.) x 10[sup -5] and[Beta][B[sup+][yields] K*[sup+][gamma]]= 3.83[+-] 0.62(stat.)[+-] 0.22(syst.) x 10[sup -5]. We find no evidence for direct CP violation in the decays and constrain -0.170
Radiative and Leptonic B-meson Decays from the B-factories
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
Radiative and leptonic decays of B-mesons represent an excellent laboratory for the search for New Physics. I present here recent results on radiative and leptonic decays from the Belle and BABAR collaborations. Radiative penguin and leptonic B-meson decays are excellent probes for investigating the effects of New Physics. Although current measurements are in agreement with the Standard Model expectations, they are still quite useful for setting bounds on possible NP models. The B → X{sub s}[gamma] and B → [tau][nu] measurements, for example, put strong constraints on the mass of charged Higgs bosons in Type II two-Higgs double models. The B → X{sub s}[gamma] branching fraction measurements also constrain models with universal extra dimensions.
Author: