The LHCb experiment has been designed to perform precision measurements in the flavour physics sector at the Large Hadron Collider (LHC). The measurement of the CP -violating observable defined as ”ACP = ACP (Lb0 -> pK-) - ACP (Lb0 -> ppi-), where ACP (Lb0 -> pK-) and ACP (Lb0 -> ppi-) are the di CP asymmetries in Lb0 -> pK- and Lb0 -> ppi- decays, is presented for the first time using LHCb data. Using the full 2011 and 2012 data sets of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of about 3 fb-1, the value ›ACP = (0.8 ± 2.1 ± 0.2)% is obtained. The first uncertainty is statistical and the second corresponds to one of the dominant systematic effects. As the result is compatible with zero, no evidence of CP violation is found. This is the most precise measurement of CP violation in the decays of baryons containing the b quark to date. Once the analysis will be completed with an exhaustive study of systematic uncertainties, the results will be published by the LHCb Collaboration.

Measurement of CP asymmetries in Lb0 -> pK- and Lb0 -> ppi€- decays at LHCb

Ferrari, F.
2016

Abstract

The LHCb experiment has been designed to perform precision measurements in the flavour physics sector at the Large Hadron Collider (LHC). The measurement of the CP -violating observable defined as ”ACP = ACP (Lb0 -> pK-) - ACP (Lb0 -> ppi-), where ACP (Lb0 -> pK-) and ACP (Lb0 -> ppi-) are the di CP asymmetries in Lb0 -> pK- and Lb0 -> ppi- decays, is presented for the first time using LHCb data. Using the full 2011 and 2012 data sets of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of about 3 fb-1, the value ›ACP = (0.8 ± 2.1 ± 0.2)% is obtained. The first uncertainty is statistical and the second corresponds to one of the dominant systematic effects. As the result is compatible with zero, no evidence of CP violation is found. This is the most precise measurement of CP violation in the decays of baryons containing the b quark to date. Once the analysis will be completed with an exhaustive study of systematic uncertainties, the results will be published by the LHCb Collaboration.
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Ferrari, F.*
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/621832
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