Search results for "HCB"
showing 2 items of 42 documents
Study of Bs->PhiGamma decays at LHCb
2021
This thesis describes two different analyses performed at LHCb using the B0s→φγ and B0→K∗0γ decay channels. First, the measurement of the ratio of branching fractions B(B0→K∗0γ)/B(B0s→φγ) is presented, giving the most precise value for B(B0s→φγ) to date. Secondly, the CP-violating observables S and C, as well as the mixing-induced A∆ parameter are measured through a time-dependent analysis of the B0s→φγ decay channel, this being the first time the S and C observables are probed in the Bs system. These studies are performed using data collected in 2011 and 2012 by the LHCb experiment at CERN, corresponding to an integrated luminosity of 3.0 fb−1 of pp collisions at a center-of-mass energy of…
Study of Long-Lived particles beyond the Standard Model at LHCb
2022
Long-lived particles are predicted in many extensions of the Standard Model but the experimental detection is very challenging because they decay out of the first trackers and usually scape to the trigger decisions. In this work we review several new physics models and summarize the experimental status concerning the related searches. We revise the capabilities of the high level trigger system of the LHCb experiment and evaluate the effect of the trigger to detect long-lived particles for two models: a previous work where Dark Higgs Model is assumed, and another one studied for first time in this work, the Composite Higgs involving light scalars signatures. A Montecarlo study about the deca…