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Title	Search for new physics in CP violation with beauty and charm decays at LHCb
Author(s)	Bartolini, Matteo (Genoa U. ; INFN, Genoa)
Collaboration	LHCb
Publication	SISSA, 2019
Number of pages	6
In:	PoS DIS2019 (2019) 250
In:	The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019, pp.250
DOI	10.22323/1.352.0250
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; LHCB
Abstract	LHCb is one of the four big experiments operating at LHC and it's mainly dedicatedto measurements of $C\!P$ violation and to the search for new physics in the decays ofrare hadrons containing heavy quarks. The LHCb collaboration has recently published a result which shows for the first time a compelling 5.3 $\sigma$ evidence of $C\!P$ violation in the two-body meson $D^{0}\rightarrow K^{+}K^{-}$ and $D^{0}\rightarrow \pi^{+}\pi^{-}$ decays.$C\!P$ violation in the Cabibbo-suppressed decays $D^{+}_{s} \rightarrow K^{0}_{S}\pi^{+}$, $D^{+} \rightarrow K^{0}_{S}K^{+}$, $D^{+} \rightarrow \phi \pi^{+}$ is expected to be small ($\sim10^{-3}$) due to interference between tree and penguin diagrams and thus sensible to contributions Beyond Standard Model (BSM). The last measurement by LHCb of direct $C\!P$ asymmetries in theaforementioned decay channels shows consistency with the hypothesis of $C\!P$ conservation.In the $B_{s}$ sector the $C\!P$ violating phase $\phi_{s}$ receives contributions from direct decay and mixing and may also be sensitive to BSM contributions. The last two publishedmeasurements of $\phi_{s}$ using the $B_{s}\rightarrow J/\psi K^{+}K^{-}$ and $B_{s}\rightarrow J/\psi \pi^{+} \pi^{-}$ decay channels show a combined 2 $\sigma$ hint of $C\!P$ violation.
Copyright/License	publication: © 2019-2024 Author(s) (License: CC-BY-NC-ND-4.0)

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