3,919 research outputs found
CP violation in Bs mixing at LHCb
The CP violating phase can be measured in the interference between
mixing and decay of mesons decaying to CP eigenstates. The phase
the decay width difference and the average decay
width have been measured at LHCb, using the full 1 fb of
collisions data at a centre-of-mass energy = 7 TeV collected during
the 2011 LHC run.Comment: 8 pages, 4 figures, proceedings for HQL 2012 conference. On behalf of
the LHCb Collaboratio
A -baryon sonata
LHCb is one of the four experiments at the Large Hadron Collider (CERN),
dedicated to the study of b-hadrons. Throughout my research, I studied in
particular b-baryons which are abundantly produced at the LHCb. My habilitation
summarises the studies of fundamental properties of these particles within the
Standard Model. In particular, I discuss both lifetime and mass measurements.
This work is followed by a search of New Physics using a Lepton universality
test. Finally, I discuss my contribution to the upgrade detectors of the LHCb
experiment in particular those related to the calorimeter and the scintillator
fibre tracker
Isospin extrapolation as a method to study inclusive decays
A novel approach to reconstruct inclusive decays is presented. The method relies on isopsin symmetry to
extrapolate the semi-inclusive signature to
the fully inclusive rate in and decays. We investigate the
possibility to measure branching fractions and other observables such as lepton
universality ratios and asymmetries. As a proof of concept, fast
simulation is used to compare the signature
with a fully inclusive approach. Several experimental advantages are seen which
have the potential to make measurements of inclusive decays tractable at a hadron collider.Comment: 4 pages, 2 figures, contribution to the Offshell-2021 conferenc
Changing molecular epidemiology of methicillin-resistant Staphylococcus aureus in an Algerian hospital.
INTRODUCTION: Methicillin-resistant Staphylococcus aureus (MRSA) is a major cause of both hospital- and community-acquired infections worldwide. However, data about the molecular epidemiology of MRSA in North Africa are still scarce.
METHODOLOGY: All MRSA isolates recovered between January 2006 and July 2011 from one Algerian hospital were genetically and phenotypically characterized.
RESULTS: The predominance of a European community-associated-MRSA (CA-MRSA) clone (ST80-SCCmec IV-PVL positive) was revealed by this analysis.
CONCLUSION: Our data suggest that a CA-MRSA clone recently invaded the hospital setting in Algiers and replaced a typical hospital-associated pandemic clone such as the Brazilian clone (ST239-SCCmec IIImercury-PVL negative)
Dispersive analysis of local form factors
We perform an analysis of local form factors. We
use dispersive techniques to provide a model-independent parametrisation of the
form factors that can be used in the whole kinematic region. We use lattice QCD
data to constrain the free parameters in the form factors expansion, which is
further constrained by endpoint relations, dispersive bounds, and SCET
relations. We analyse different scenarios, where we expand the form factors up
to different orders, and their viability. Finally, we use our results to obtain
predictions for some observables in
decays, as the differential branching ratio, the forward-backwards lepton
asymmetry and the branching ratio of .
Finally, we provide a python notebook based on the software EOS to reproduce
our result.Comment: 21 pages, 4 figures, 1 ancillary file, v2: correction of typos, v3:
version accepted in JHE
Prospects for searches of decays at FCC-ee
We investigate the physics reach and potential for the study of various
decays involving a transition at the Future Circular
Collider running electron-positron collisions at the -pole (FCC-ee). Signal
and background candidates, which involve inclusive contributions from
, and final states, are simulated for a proposed
multi-purpose detector. Signal candidates are selected using two Boosted
Decision Tree algorithms. We determine expected relative sensitivities of
, , and for the branching fractions of the
, , and decays, respectively. In addition, we investigate the impact of
detector design choices related to particle-identification and vertex
resolution. The phenomenological impact of such measurements on the extraction
of Standard Model and new physics parameters is also studied
Prospects for searches of b → sν ν ¯ decays at FCC-ee
We investigate the physics reach and potential for the study of various decays involving a b→sνν¯ transition at the Future Circular Collider running electron-positron collisions at the Z-pole (FCC-ee). Signal and background candidates, which involve inclusive Z contributions from bb¯, cc¯ and uds final states, are simulated for a proposed multi-purpose detector. Signal candidates are selected using two Boosted Decision Tree algorithms. We determine expected relative sensitivities of 0.53%, 1.20%, 3.37% and 9.86% for the branching fractions of the B0→K∗0νν¯, Bs0→ϕνν¯, B0→KS0νν¯ and Λb0→Λνν¯ decays, respectively. In addition, we investigate the impact of detector design choices related to particle-identification and vertex resolution. The phenomenological impact of such measurements on the extraction of Standard Model and new physics parameters is also studied
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