Dr
Axel Maas
(Friedrich Schiller University Jena (DE))
07/07/2012, 09:00
Track 10. Lattice QCD
Parallel Sessions
It is a remarkable fact that an interaction as weak as QED can sustain bound states. A similar feature naturally can also be expected for the weak interactions. In fact, it has been conjectured in the late seventies that to leading order in an expansion in the Higgs condensate such bound states will have the same mass as the corresponding elementary particle at tree level. Using...
Prof.
Keisuke Juge
(University of the Pacific (US))
07/07/2012, 09:15
Track 10. Lattice QCD
Parallel Sessions
We present some preliminary results for single-particle and multi-particle states obtained on anisotropic, dynamical 2+1 lattices (24^3) generated by the Hadron Spectrum Collaboration. We use the Stochastic LapH algorithm to generate the all-to-all quark propagators.
Dr
Thorsten Kurth
(Bergische Universitรคt Wuppertal (DE))
07/07/2012, 09:30
Track 10. Lattice QCD
Parallel Sessions
Indirect CP violation in K -> pipi decays plays a central role in constraining the flavor structure of the Standard Model
and in the search for new physics. For many years the leading uncertainty in the SM prediction of this phenomenon was the one associated with the nonperturbative strong interaction dynamics in this process. I will present a fully nonperturbative lattice QCD calculation of...
Dr
Fabio Bernardoni
(DESY (DE))
07/07/2012, 09:45
Track 10. Lattice QCD
Parallel Sessions
At present there is a tension at the level of 3 \sigma between two exclusive determinations of |Vub|. They are obtained combining the experimental branching ratios of B -> \tau \nu and B -> \pi l \nu (respectively) with a theoretical computation of the hadronic matrix elements f_B and the B to \pi form factor f_+(q^2). To understand the tension, improved precision and a careful analysis of the...
Dr
Andrea Shindler
(Humboldt University (DE))
07/07/2012, 10:00
Track 10. Lattice QCD
Parallel Sessions
Present and future experiments will reach unprecedented precision in the measurements of physical quantities related to B-physics. Therefore an accurate theoretical determination of intrinsically non-perturbative parameters, relevant for studies of B-physics, is required in many phenomenological analyses to further constrain the Standard Model and to explore New Physics scenarios. The goal of...
Prof.
Soeren Andre Prell
(Iowa State University (US))
07/07/2012, 10:15
Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches
Parallel Sessions
We present a set of new results in tau-lepton physics using the full BABAR data set. This includes a new limit on the branching fraction of the isospin-forbidden, second-class-current decay tau --> pi eta'(958) nu_tau; a first study of high-multiplicity tau decays with charged kaons; and measurements of the branching fractions of 3- and 5-prong tau decays.
Using the full BABAR dataset, we...
Prof.
Min-Zu Wang
(National Taiwan University (TW))
07/07/2012, 10:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present new branching fraction measurements of rare radiative $D$ decays and compare these measurements with the theoretical predictions. The results are obtained from a large data sample collected near the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.
Prof.
Kwei-Chou Yang
(Chung Yuan Christian University (TW))
07/07/2012, 11:00
Track 5 - B-Physics
Parallel Sessions
We study two-body charmless hadronic $B$ decays involving a tensor meson in the final state within the framework of QCD factorization (QCDF). Unlike the light vector meson, because of the G-parity of the tensor meson, both the chiral-even and chiral-odd two-parton light-cone distribution amplitudes of the tensor meson are antisymmetric under the interchange of momentum fractions of the quark...
Dr
Fernando Luiz Ferreira Rodrigues
(CBPF - Brazilian Center for Physics Research (BR))
07/07/2012, 11:15
Track 5 - B-Physics
Parallel Sessions
Charmless multibody B decays proceeding through the quark transitions b -> q qbar s(d) are relevant laboratories to study both direct and mixing-induced CP violation effects and to search for deviations from Standard Model expectations. The 1.0 fbโ1 of data recorded by the LHCb experiment in 2011 have been analyzed to reconstruct B+, B0 and B0s decays in various multibody final states. We...
Dr
Torsten Leddig
(Universitรคt Rostock (DE))
07/07/2012, 11:30
Track 5 - B-Physics
Parallel Sessions
Baryonic decays account for about 7% of the B-meson width, but are far less studied than decays into meson-only final states. We present new studies of the processes B- --> Sigma_c++ pbar pi- pi- and B0bar --> Lambda_c+ pbar p pbar. The former decay is a resonant subchannel of the 5-body decay B- --> Lambda_c+ pi+ pbar pi- pi-, which is the known baryonic decay mode with the largest branching...
Ms
T'Mir Julius
(University of Melbourne (AU))
07/07/2012, 11:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The measurement of $B^0 \to \pi^0 \pi^0$ plays a vital role in the extraction of the UT angle $\phi_2 = arg[-V_{td} V_{tb}^*/V_{ud} V_{ub}^* ]$ from time-dependent CP analyses of the $B\to \pi\pi$ decays. This process is also expected to exhibit direct CP violation, a measurement of which would place additional constraints on $\phi_2$. Furthermore, an improved analysis of $B^0 \to \pi^0 \pi^0$...
Prof.
Alexander Bondar
(Novosibirsk State University (RU))
07/07/2012, 12:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We report the results of the $R_b$ scan in the region from 10750 MeV to 11020 MeV in steps of 5 MeV. The scan data were collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. This result can be used to map the shape of the $\Upsilon(10860)$ and $\Upsilon(11020)$ resonances. The search for the tetraquark candidate $Y(10900)$ is also reported.
We report on the...
Ms
Alexandra Martin Sanchez
(Universite de Paris-Sud 11 (FR))
07/07/2012, 12:15
Track 5 - B-Physics
Parallel Sessions
The LHCb experiment is a general purpose forward spectrometer operating at the Large Hadron Collider, optimized for the study of B and D hadrons. LHCb collected 1.0 fb-1 of integrated luminosity during 2011 data taking, collecting unprecedented large samples of B hadron decays to final states involving charmed hadrons. These decays offer many complementary measurements of CP violation and CKM...
Ms
Felicitas Thorne
(Institute of High Energy Physics (AT))
07/07/2012, 12:30
Track 5 - B-Physics
Parallel Sessions
We study the decays $B^0_s\rightarrow J/\psi\phi$ and $B^0_s\rightarrow J/\psi K^+K^-$ using a 121.4 fb$^{-1}$ data sample collected at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The decay $B^0_s\rightarrow J/\psi\phi$ is an important mode for measuring the CP violating phase $\beta_s$ in the $B_s\bar{B}_s$ mixing, which is of...
Mr
Christian Peter Linn
(Ruprecht-Karls-Universitaet Heidelberg (DE))
07/07/2012, 12:45
Track 5 - B-Physics
Parallel Sessions
The LHCb experiment is a forward arm spectrometer designed to make high precision measurements of b hadron decays at the LHC. During 2011 a total luminosity of 1.0 fb-1 of data was collected at sqrt(s)=7 TeV. LHCb's efficient dimuon trigger allows to perform studies of B mesons decaying to charmonia with high precision. We will present new measurements of the relative branching ratios of...
Prof.
Peter Ratoff
(Lancaster University (UK))
07/07/2012, 13:45
Track 5 - B-Physics
Parallel Sessions
Updated measurements of the lifetimes of the Lambda_b and of the B0s are obtained using the full data sample collected with the D0 detector in Run II of the Tevatron collider. For the B0s the lifetime measurement is obtained from a study of a sample of semileptonic decays, B0s--->Ds+mu+X, while in the case of the Lambda_b the fully reconstructed decay Lambda_b-->J/psi+Lambda0 is used.
Dr
Anna Phan
(Syracuse University (US))
07/07/2012, 14:00
Track 5 - B-Physics
Parallel Sessions
Precision measurements of b-hadron lifetimes are a key goal of the LHCb experiment. In the B0s sector, the measurement of the effective lifetimes for B0s mesons decaying to CP-odd, CP-even and flavour specific final states are essential for constraining the B0s mixing parameters, ฮฮs, the average width ฮs and the CP-violating phase, ฯs. We present measurements of the effective lifetimes of B0s...
Dr
Stefania Vecchi
(INFN Ferrara)
07/07/2012, 14:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The identification of the flavour of reconstructed B0 and B0s mesons at production is necessary for the measurements of oscillations and time-dependent CP asymmetries. We report on the techniques developed by the LHCb experiment for flavor tagging and on the procedures used to optimize and calibrate its performance using data samples of different flavour-specific B decays. We also describe the...
Dr
Riccardo de Sangro
(INFN Frascati (IT))
07/07/2012, 14:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
While CP violation in the B-meson system has been well established by the B factories, there has been no direct observation of time-reversal violation in this system. Using 468 million B-Bbar pairs collected by the BABAR detector at SLAC, we measure T-violating parameters in the time evolution of neutral-B mesons by comparing the probabilities of B0 or anti-B0 transforming into definite CP...
Mr
Bastian Kronenbitter
(KIT)
07/07/2012, 14:45
Track 5 - B-Physics
Parallel Sessions
We present a precise measurement of time-dependent CP violation in the neutral $B$ decays into charmonium and $K^0$ with a large data sample containing 772 million $B\overline{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.
Prof.
Marina Artuso
(Syracuse University (US))
07/07/2012, 15:00
Track 5 - B-Physics
Parallel Sessions
During 2011 data taking, LHCb has recorded large samples of semileptonic B decays. These provide potential to study CP violation effects in all of the D0, B0 and B0s systems. For the former, the charge of the muon in B -> D0 ฮผ ฮฝ X decays provides a novel procedure to tag the flavour of the neutral D meson at production, allowing competitive sensitivity for the measurement of the difference of...
Mr
Mirco Dorigo
(INFN Trieste & University of Trieste (IT))
07/07/2012, 15:15
Track 5 - B-Physics
Parallel Sessions
Using the complete 10/fb dataset, the CDF experiment has studied CP violation in several hadronic decay modes of bottom hadrons.
In the decays of Bd, Bs, and Lambda_b hadrons into charmless two-body final states, we present results including improved measurements of the branching ratios and time-integrated CP-violating asymmetries of known decays and tightened constraints on these quantities...
Dr
Iain Bertram
(Lancaster University)
07/07/2012, 15:30
Track 5 - B-Physics
Parallel Sessions
We present measurements of the flavor-specific semileptonic asymmetry for B0d and B0s mesons using the full Run II data sample collected with the D0 detector at the Fermilab Tevatron collider. Three different decay channels are analysed: B0-->mu+D+X, with D-->Kpipi, B0-->mu+D*+X with D*-->D0pi, D0-->Kpi, and B0s-->Ds+mu+X, with Ds-->phipi, phi-->KK.
We extract the charge asymmetries as a...
Dr
Sandro Palestini
(CERN (CH))
07/07/2012, 16:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
A large sample (20 k) of Bs -> J/psi Phi decays were collected by ATLAS in year 2011. The transition to states with defined CP eigenvalues have been studied through angular correlations in decays of J/psi and Phi. ย Measurement of the lifetimes of the different eigenstates and the CP-violating mixing phase phi_s have been recently obtained and are presented.
Dr
Greig Cowan
(EPFL (CH))
07/07/2012, 16:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The determination of the CP-violating phase ฯs in B0s -> J/ฯ ฯ decays is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model but can be significantly enhanced in many models of new physics. We present the world's best measurement of ฯs and the first observation of a non-zero ฮฮs based upon 1.0 fbโ1 of data collected at LHCb during 2011. ฯs...
Dr
Dmitri Tsybychev
(Stony Brook University (US))
07/07/2012, 16:30
Track 5 - B-Physics
Parallel Sessions
We report updated measurement of the CP-violating phase phi_s and of the decay width differences for the two mass eigenstates DeltaGamma_s from the flavor-tagged decay B0s-->J/psi+phi. We also present measurements of the branching ratios for the decays B0s-->J/psi+f0 and B0s-->J/psi+f2, a study of the angular distribution for the latter decay and improve the determination of the CP violation...
Dr
Jeremy Dalseno
(Max-Planck-Institut fรผr Physik)
07/07/2012, 16:45
Track 5 - B-Physics
Parallel Sessions
We present a time-dependent measurement of CP violation parameters in $B^0 \to \pi^+\pi^-$ decays.
These results are obtained from the full data sample that contains 772 million $B\overline{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy
$e^+e^-$ collider.
Dr
Andrew Stephen Powell
(University of Oxford (GB))
07/07/2012, 17:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The LHCb experiment is a general purpose forward spectrometer operating at the Large Hadron Collider, optimized for the study of B and D hadrons. LHCb collected 1.0 fb-1 of integrated luminosity during 2011 data taking, collecting unprecedented large samples of B hadron decays to final states involving charmed hadrons. These decays offer many complementary measurements of CP violation, in...
Dr
Eli Ben Haim
(LPNHE, IN2P3-CNRS, Universities of Paris VI (FR))
07/07/2012, 17:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We report a measurement of CP violation in the decay B0 --> pi+ pi- pi0 using the full Upsilon(4S) sample of the BABAR experiment. We perform a full time-dependent Dalitz-plot analysis sensitivity to the interference between B0 and B0bar decays, as well as between the intermediate rho --> pi pi resonances. This allows us to extract the CKM unitarity-triangle angle alpha with reduced ambiguity...
Dr
Paul Soler Jermyn
(University of Glasgow (GB))
07/07/2012, 17:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Direct and mixing-induced CP violation observables in charmless charged two-body B decays may provide valuable information in the quest for physics beyond the Standard Model. Owing to the large beauty production cross-section at the LHC and to the unique characteristics of the LHCb detector and trigger, unprecedented samples of such decays are becoming available. We present updated...
Dr
Sascha Turczyk
(Lawrence Berkeley National Laboratory (US))
07/07/2012, 17:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
There has been a lot of recent interest in experimental hints of CP violation in B_{d,s}^0 mixing. The D0 measurement of the semileptonic CP asymmetry would - with higher significance - be a clear signal of beyond the standard model physics. In this talk I present a relation [arXiv:1203.3545] for the mixing parameters, which allows clearer interpretation of the data in models in which new...
