Abstract

LHCb is a dedicated heavy flavour physics precision experiment at the LHC searching for New Physics (NP) beyond the Standard Model (SM) through the study of very rare decays of beauty and charm-flavoured hadrons and precision measurements of CP-violating observables. In this review I will present a selection of recent precision measurements of CP-violating observables in the decays of beauty and charm-flavoured hadrons. These measurements are based on an integrated luminosity of up to 1.0 fb−1 collected by LHCb in 2011.

Highlights

  • The LHCb detector has been taking data with high efficiency during the last three years of operation at the LHC, producing a wealth of exciting physics results, which have made an impact on the flavour physics landscape and proved the concept of a dedicated heavy flavour spectrometer in the forward region at a hadron collider.The LHC is the world’s most intense source of b hadrons.√The bb cross-section in proton-proton collisions at s = 7 TeV is measured to be ∼300 μb, implying that more than 1011 bb pairs were produced in LHCb in 2011, when an integrated luminosity of 1.0 fb−1 was collected

  • I report on a few recent precision measurements of CP-violating observables in decays of beauty and charm-flavoured hadrons, while the study of rare decays at LHCb is covered by a separate contribution [2]

  • Based on approximately 800 B± → DK± decays with D → KS0h+h− selected from 1.0 fb−1 of data, the following results were obtained for the weak phase γ and the ratio rB between the suppressed and favoured B decay amplitudes, γ = (44+−4338)◦, with a second solution at γ → γ + 180◦, and rB = 0.07 ± 0.04

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Summary

Introduction

The LHCb detector has been taking data with high efficiency during the last three years of operation at the LHC, producing a wealth of exciting physics results, which have made an impact on the flavour physics landscape and proved the concept of a dedicated heavy flavour spectrometer in the forward region at a hadron collider. At the nominal LHC design luminosity of 1034 cm−2 s−1, multiple pp collisions within the same bunch crossing (so-called pile-up) would significantly complicate the b decay-vertex reconstruction and flavour tagging, and increase the combinatorial background. For this reason the detector was designed to operate at a reduced luminosity. The detector is designed as a singlearm forward spectrometer covering the pseudorapidity range 2 < η < 5, which ensures a high geometric efficiency for detecting all the decay particles from one b hadron together with decay products from the accompanying b hadron to be used as a flavour tag. I report on a few recent precision measurements of CP-violating observables in decays of beauty and charm-flavoured hadrons, while the study of rare decays at LHCb is covered by a separate contribution [2]

Measurement of the Bs mixing phase
Measurement of the weak phase γ from tree-level decays
CP violation in charmless B decays
CP violation in charm
Conclusion
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