LHC students poster session

Session

Physics of heavy flavours

3

4 Mar 2015, 17:03

Restaurant 1 (CERN)

Description

• charm and bottom hadron decays
• charm and bottom hadron spectroscopy
• CKM and CP violation
• BSM studies with heavy quarks

0. Measurement of the semileptonic CP asymmetry in B0–\bar{B0} mixing with LHCb

04/03/2015, 17:03

The semileptonic CP asymmetry in B0−B⎯⎯⎯0 mixing, adsl, is measured in proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, recorded by the LHCb experiment. Semileptonic B0 decays are reconstructed in the inclusive final states D−μ+ and D∗−μ+, where the D− meson decays into the K+π−π− final state, and the D∗− meson into the D⎯⎯⎯0(→K+π−)π− final state. The...

1. $\mathcal{CP}$ violating phase $\phi_s$ and penguin pollution in $B_s^0\to J/\psi K^+K^-$ with LHCb

Carlos Vazquez Sierra (Universidade de Santiago de Compostela (ES))

04/03/2015, 17:04

CP violating phase φs appears in b → anti(c)cs transitions due to the interference between the direct decay and the decay after the Bs⁰-anti(Bs⁰) mixing. In SM, φs = -2βs + δP, where -2βs is related to CKM matrix elements and δP is the penguin phase where contributions due to penguin diagrams are taken into account, being this δP phase also the main source of theoretical uncertainty in φs....

2. Production asymmetries of neutral B mesons in pp collisions at LHCb

Fabio Ferrari (University of Bologna and INFN (IT))

04/03/2015, 17:08

The B0bar-B0 and Bsbar-Bs production asymmetries, AP(B0) and AP(Bs), are measured by means of a time-dependent analysis of B0 -> J/\psi K*0, B0 -> D- pi+ and Bs -> Ds- pi+ decays, using a data sample corresponding to an integrated luminosity of 1.0 fb^{-1}, collected by LHCb in pp collisions at a centre-of-mass energy of 7 TeV. The measurements are performed as a function of transverse...

8. Angular analysis of the $B^0 \to K^{*0} e^+ e^-$ decay in the low-$q^2$ region at LHCb

Martino Borsato (Laboratoire de l'Accelerateur Lineaire (FR))

04/03/2015, 17:09

An angular analysis of the $B^0 \rightarrow K^{*0} e^+ e^-$ decay is performed using a data sample, corresponding to an integrated luminosity of 3.0${\mbox{\,fb}^{-1}}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared ($q^2$) interval...

9. CKM angle $\gamma$ from LHCb

Jackson William Smith (University of Cambridge (GB))

04/03/2015, 17:10

Results of the latest $\gamma$ combination from LHCb are presented, along with the six LHCb measurements used as inputs. In addition, the anticipated precision attainable for measuring $\gamma$ after the LHCb Upgrade is outlined.

37. Search for CP violation in $D^0\rightarrow \pi^-\pi^+\pi^0$ decays with LHCb

Shanzhen Chen (University of Manchester (GB))

04/03/2015, 17:11

The LHCb experiment has recorded the world's largest sample of charmed meson decays. This contribution presents a study of a $D^0$ meson decaying into a final state containing a neutral pion in LHCb. The search for $CP$ violation exploits a novel model-independent unbinned technique to assign a $p$-value for the no $CP$ violation hypothesis. With a data sample size exceeding that of previous...

41. First observation and measurement of the branching fraction for the decay $B^0_s \to D_s^{*} K$ with LHCb.

Lorenzo Sestini (Universita e INFN (IT))

04/03/2015, 17:12

The Bs* -> Ds* K and Bs* -> Ds* \pi decays are of paramount interest as they can be used, combined with Bs -> Ds K and Bd -> D* \pi, to measure the weak phase \gamma. We present the first observation of the Bs* -> Ds* K decay, where Ds* are reconstructed through the decay chain Ds* -> Ds (-> K K \pi) \gamma, using an integrated luminosity of 3.0 fb^{-1} recorded by the LHCb experiment.

42. Differential branching fraction and angular anaysis of $\Lambda_b\to\Lambda\mu^+\mu^-$ decays with the LHCb experiment

Luca Pescatore (University of Birmingham (GB))

04/03/2015, 17:13

The differential branching fraction of the rare decay Λ0b → Λμ+μ− is measured as a function of q2, the square of the dimuon invariant mass. The analysis is performed using data collected by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb−1. These include evidence for signal at dimuon masses below the square of the J/ψ mass with significance above 3σ. In the q2...

55. Study of the rare $B^{0}_{s}$ and $B^{0}$ decays into the $\pi^{+}\pi^{-}\mu^{+}\mu^{-}$ final state at LHCb

Ilya Komarov (Ecole Polytechnique Federale de Lausanne (CH))

04/03/2015, 17:14

A search for the rare decays B0s->pi pi mu mu and B0->pi pi mu mu is performed in a data set corresponding to an integrated luminosity of 3.0 fb-1 collected by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7 and 8TeV. Decay candidates with pion pairs that have invariant mass in the range 0.5--1.3 GeV/c2 and with muon pairs that do not originate from a...

59. $\sin(2\beta)$ with $B^0 \rightarrow J/\!\psi K_\text{S}$ at the LHCb experiment

Ramon Niet (Technische Universitaet Dortmund (DE)), Vanessa Mueller (Technische Universitaet Dortmund (DE))

04/03/2015, 17:15

62. Associated production of $Z$ boson and prompt and non-prompt $J/\psi$ mesons with the ATLAS experiment

Stefanos Leontsinis (National Technical Univ. of Athens (GR))

04/03/2015, 17:16