Description
- charm and bottom hadron decays
- charm and bottom hadron spectroscopy
- CKM and CP violation
- BSM studies with heavy quarks
Dr
Maria Zangoli
(INFN and Università di Bologna (IT))
21/03/2012, 17:03
The LHCb experiment is designed to perform flavour physics measurements at the Large Hadron Collider. Using a data sample corresponding to an integrated luminosity of 0.35 fb$^{-1}$ collected by LHCb in 2011, we report measurements of the direct CP asymmetries in the $B^0\to K^+\pi^-$ and $B_s^0\to \pi^+K^-$ decays. The results obtained represent the first evidence of CP violation in the...
Joel Bressieux
(Ecole Polytechnique Federale de Lausanne (CH))
21/03/2012, 17:03
In this poster, we present the narrow J/ψφ resonances X(4140) and X(4274) search as well as the X(3872) mass and productions cross-section measurements. These analysis have been done using pp collisions data collected at LHCb.
Gregory Max Ciezarek
(Imperial College Sci., Tech. & Med. (GB))
21/03/2012, 17:03
A search for the decay B+ to pi mu mu is presented using 1.0~fb$^{-1}$ of pp collision data integrated luminosity collected with the LHCb experiment at the Large Hadron Collider during 2011.
This decay is observed for the first time with 5.2 $\sigma$ significance, at a branching fraction \BR(\pimumu) = (2.4~$\pm$~0.6~(stat)~$\pm$~0.2~(syst))$\times 10^{-8}$.
Livio Bianchi
(Universita e INFN (IT))
21/03/2012, 17:03
The first measurement of inclusive of J/psi polarization at the LHC was carried out in p-p collisions at √s = 7TeV, with the ALICE experiment. Reconstructing J/psi in the muon channel at forward rapidity (2.5 < y < 4), we have measured its polarization to be rather small, with a clearly finite value only for the lowest measured bin in transverse momentum, 2-3 GeV/c, in the helicity reference frame.
Ricardo Vazquez Gomez
(Depto. d' Estruc. i Cons. de la Mat-Facultad de Fisica-Universid)
21/03/2012, 17:03
We present the measurement of direct CP asymmetry in the decay B^0->K* gamma with the full 2011 dataset in LHCb. A comparison with the SM prediction, as well as previous results is given.
Zhou Xing
(Syracuse University (US))
21/03/2012, 17:03
Heavy quark production in 7 TeV pp collisions at the LHC need not be flavour symmetric. Here the production asymmetry, Ap , between Ds+ and Ds- mesons is measured using the phi pi decay mode. The difference between pi+ and pi- detection efficiencies is measured using the ratio of fully reconstructed to partially reconstructed D* decays. Using 1 fb^-1 of data collected with the LHCb detector,...
Markus Fasel
(GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
21/03/2012, 17:03
We present the differential cross section of electrons from heavy-flavour hadron decays in pp collisions at √s = 7 TeV. Results are compared to FONLL pQCD calculations.
Sean Benson
(University of Edinburgh (GB))
21/03/2012, 17:03
An untagged, time-integrated analysis of the Bs -> phi phi decay has been performed with 1 fb-1 of pp collision data at centre-of-mass (COM) energy \sqrt{s} = 7 TeV taken using the LHCb detector. Optimised selections have yielded 801 Bs -> phi phi events at high signal to background ratio. This has allowed for measurements of polarisation amplitudes ($|A_0|^2$, $|A_\perp|^2$,...
Fiorella Fionda
(Universita e INFN (IT))
21/03/2012, 17:03
The ALICE experiment at the LHC has studied the J/psi production at mid-rapidity in pp collisions at sqrt(s) = 7 TeV through its electron pair decay. The fraction of J/psi from the decay of long-lived beauty hadrons was determined on a data sample corresponding to an integrated luminosity Lint = 5.6 nb−1 for J/psi candidates with transverse momentum pt > 1.3 GeV/c and rapidity |y| < 0.9. The...
Paolo Gandini
(University of Oxford (GB))
21/03/2012, 17:03
Christophe Cauet
(Technische Universitaet Dortmund (DE)), Mr
Tobias Brambach
(Technische Universitaet Dortmund (DE))
21/03/2012, 17:03
The results of the LHCb opposite side flavour tagging optimisation and calibration on the 2011 dataset are presented.
Candan Dozen
(Cukurova University),
Gul Gokbulut
(Cukurova University)
21/03/2012, 17:03
We present an overview of J/psi, psi' and Upsilon production cross-section measurements in pp collisions at sqrt(s) = 7 TeV in the CMS experiment. First results from the 1P charmonium state and the exotic X(3872) are also discussed.
Andrew Stephen Chisholm
(University of Birmingham (GB))
21/03/2012, 17:03
An observation of the chi_c and chi_b quarkonium states in proton-proton collision data at sqrt(s) = 7 TeV recorded by the ATLAS experiment is presented. The chi_c and chi_b states are reconstructed from their radiative decays to J/psi and Upsilon(1S,2S) respectively. In the charmonium sector, the chi_c1,2(1P) charmonium states are observed. This represents the first step towards more advanced...
Christoph Nageli
(Eidgenoessische Tech. Hochschule Zuerich (CH))
21/03/2012, 17:03
A search for the rare decays Bs to mu+mu- and Bd to mu+mu- is presented, performed with the CMS detector with an integrated luminosity of 5 fb^-1.
Hamish Gordon
(University of Oxford (GB))
21/03/2012, 17:03
A model-independent search for direct CP violation in the Cabibbo suppressed decay $D^+ \to K^-K^+\pi^+$ in a sample of approximately 370,000 decays is described. The normalized Dalitz plot distributions for $D^+$ and $D^-$ are compared using four different binning schemes that are sensitive to different manifestations of CP violation. No evidence for CP asymmetry is found.
Bakul Gaur
(Universitaet Siegen (DE)),
Elisa Musto
(Universita e INFN (IT))
21/03/2012, 17:03
The Bs0 -> μμ decay is a Flavour Changing Neutral Current process, highly suppressed in the Standard Model (SM). The small SM prediction of 3 x 10-9 might be substantially enhanced by coupling to new heavy particles. An analysis based on 2.4 fb−1 of integrated luminosity, using a multivariate, multi-bin selection method is presented. A limit of BR (Bs0 -> μμ) ≤ 2.2E-8 at 95% CL is obtained.
Frederic Dupertuis
(EPFL - Lausanne)
21/03/2012, 17:03
The determination of the CP-violating phase φs in B0s → J/ψφ 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 φs and the first observation of a non-zero ∆Γs based upon 1fb−1 of data collected at LHCb during 2011.
Stefano Perazzini
(INFN Bologna (IT))
21/03/2012, 17:03
Using an integrated luminosity of 0.69 fb-1 collected by LHCb in 2011, we report measurements of direct and mixing-induced CP violation in $B^0\to\pi^+\pi^-$ and $B_s^0\to K^+K^-$ decays. The measurements of the B0p+p- asymmetries are compatible with those from the B factories and yield 3.2s evidence of mixing-induced CP violation, whereas the Bs0K+K- asymmetries are measured for the first time ever.
