arXiv subjects

Stefano Perazzini

Publications and source records attributed to Stefano Perazzini.

3 recordsLinked to original sources

arXiv2019

Progress and challenges in the study of direct CP violation and $γ$ determinations: summary of CKM 2018 working group V

In the study of CP violation within and beyond the Standard Model of particle physics, pure hadronic B decays are the key players. Improving the determination of the CKM angle $γ$ is one of the important tasks in this endeavour. Besides, the full description of pure hadronic decays due to their strong interaction dynamics remains one of the challenges. In this summary, we discuss the recent results and progress on $γ$ determinations and direct CP violation in pure hadronic B decays as presented at CKM 2018.

hep-ph↗

arXiv2013

Measurement of time-dependent $\mathcal{CP}$ violation in charmless B decays at LHCb

In the following we present the measurements of time-dependent $\mathcal{CP}$ violation in charmless B meson decays performed by LHCb analyzing the $p-p$ collision data collected at a center-of-mass energy of 7 TeV during the 2010 and 2011 LHC runs. In particular we will focus on the analysis of charmless two-body B decays where the direct and mixing-induced CP asymmetry terms of the $B^{0}\toπ^{+}π^{-}$ and $B_{s}^{0}\to K^{+}K^{-}$ decays have been measured using 0.69 fb$^{-1}$ of data collected during 2011. The measurement of the branching ratio of the $B_{s}^{0}\to K^{*0}\bar{K}^{*0}$ decay, using 35 pb$^{-1}$ collected during 2010, is also reported. In the end we show the relative branching ratios of all the decay modes of $B_{(s)}^{0}\to K_S h^{+}h^{\prime -}$ decays (where $h^{(\prime)}=π,K$), measured analyzing 1 fb$^{-1}$ of data collected during 20 11.

hep-ex↗

arXiv2011

Measurements of $A_{CP}(B^0\rightarrow K^+ π^-)$ and $A_{CP}(B_s\rightarrow π^+ K^-)$ at LHCb

The LHCb experiment is designed to perform flavour physics measurements at the Large Hadron Collider. Using data collected during the 2010 run, we reconstruct a sample of $H_b\rightarrow h^+h'^-$ decays, where $H_b$ can be either a $B^0$ meson, a $B_s^0$ meson or a $Λ_b$ baryon, while $h$ and $h^\prime$ stand for $π$, $K$ or $p$. We provide preliminary values of the direct $\mathcal{CP}$ asymmetries of the neutral $B^0$ and $B_s^0$ mesons $A_{CP} (B^0\rightarrow K^+π^-) = -0.074 \pm 0.033\mathrm{(stat.)} \pm 0.008\mathrm{(syst.)}$ and $A_{CP}(B_s^0\rightarrowπ^+K^-)=0.15 \pm 0.19\mathrm{(stat.)} \pm 0.02\mathrm{(syst.)}$.

hep-ex↗