Mr
Michael Sigamani
(Queen Mary, University of London))
31/03/2008, 15:30
We present partial branching fractions for inclusive charmless semileptonic B decays B -> Xu l ? , and the determination of the CKM matrix element |Vub |. The analysis is based on a sample of 383 million Y(4S) decays into B Bar pairs collected with the BaBar detector at the PEP-II e+e- storage rings.
Psi(4S ) -> B Bar events are tagged by the full reconstruction of a hadronic decay of one...
Mr
Mark Tibbetts
(Imperial College)
31/03/2008, 15:43
We present details of an ongoing analysis of data collected by the BaBar detector at the PEP-II asymmetric-energy $e^+ e^-$ storage rings at SLAC. Making use of a sum of exclusive final states with up to three charged pions and one neutral pion or eta, we demonstrate that it is possible to measure the ratio of the inclusive rates $b\to d \gamma$ and $b \to s \gamma$. This provides information...
Ms
Jennifer Watson
(University of Edinburgh)
31/03/2008, 15:56
Measurements of the FCNC decay B->K*ll allow for sensitive test of the Standard Model due to possible New Physics contributions in the interference between penguin and box diagrams. Results from Babar on the forward-backward asymmetry, K* polarization, rate asymmetries and branching fraction are presented. The study of additional angular variables and the extension of the analysis to inclusive...
Jelena Ilic
(University of Warwick)
31/03/2008, 16:09
We perform a time-dependent Dalitz plot analysis of B0->Kspi+pi- in order to extract the CP violation parameters of f0(980)Ks and rho0(770)Ks and direct CP-asymmetries of K*+(892)pi-. The results are obtained from a data sample of (383 +/- 3) 10e6 BBbar decays, collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The measured values of 2beta_eff in B0 decays to...
Mr
James Walder
(Lancaster University)
31/03/2008, 16:22
The measurement is reported of the branching fraction Br(Bs -> Ds(*) Ds(*)) using a data sample corresponding to 1.3 fb^{-1} of integrated luminosity collected by the D0 experiment in 2002-2006 during Run II of the Fermilab Tevatron Collider. One Ds(*) meson was partially reconstructed in the decay Ds -> phi mu nu, and the other Ds(*) meson was identified using the decay Ds -> phi pi where no...
Mr
Mark Williams
(Lancaster University)
31/03/2008, 16:35
Recently, CDF and D0 simultaneously reported the world's first ever observation of the Bs2* meson, a narrow, orbitally-excited state of the Bs meson. I will describe D0's efforts to reconstruct and study this particle in decays to B+K- (B+ -> J/psi K+), and the fitting procedure used to determine the Bs2* mass (5839.6 +- 1.1 +- 0.7 MeV). In addition, the production rate of the Bs2* relative...
Mr
Kostyantyn Holubyev
(Lancaster University)
31/03/2008, 16:48
Heavy Flavour Physics and CP Violation
We present a search for direct CP violation in $B^{\pm} \to J/\psi K^{\pm}(\pi^{\pm})$ decays.
The event sample is selected from 2.8 fb$^{-1}$ of $p\bar{p}$ collisions
collected by the D0 experiment in Run II of the Fermilab Tevatron Collider.
The charge asymmetry
$A_{CP}(B^+ \to J/\psi K^+) = +0.0075 \pm 0.0061$(stat.)$\pm 0.0027$(syst.)
is obtained using a sample of approximately...
