نتایج جستجو برای: b meson
تعداد نتایج: 908529 فیلتر نتایج به سال:
Measurements of the CKM angle β in charmless loop-dominated B meson decays at BABAR Abstract We report on preliminary measurements of time-dependent CP-violation asymmetries in charmless neutral B meson decays to K +
The contribution of B meson decays to nonphotonic electrons, which are mainly produced by the semileptonic decays of heavy-flavor mesons, in p + p collisions at √s=200 GeV has been measured using azimuthal correlations between nonphotonic electrons and hadrons. The extracted B decay contribution is approximately 50% at a transverse momentum of pT≥5 GeV/c. These measurements constrain the nucl...
We present a measurement of the Standard Model CP violation parameter sin 2φ1 based on a 29.1 fb −1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. One neutral B meson is fully reconstructed as a J/ψKS , ψ(2S)KS , χc1KS , ηcKS , J/ψKL or J/ψK ∗0 decay and the flavor of the accompanying B meson is identified from its decay product...
We present a measurement of the standard model CP violation parameter sin2 phi(1) based on a 29.1 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. One neutral B meson is fully reconstructed as a J/psi K(S), psi(2S)K(S), chi(c1)K(S), eta(c)K(S), J/psi K(L), or J/psi K(*0) decay and the flavor of the accompanying B ...
Hadronic decays of B mesons are reviewed. First, masses of B mesons and observed patterns together with physics behind them are discussed. Then the effective Hamiltonian responsible for major decays is presented and its practical applications are discussed in the context of factorization. Various tests of factorization are then studied. For rare decays, the focus is placed on Kπ, ππ final state...
We present results on time-dependentCP asymmetries in neutralB decays. The measurements use a data sample of about 88 million Υ (4S) → BB decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state and the other B meson is determined to be either a B or B fr...
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