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Measurement of the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays with the LHCb detector

The radiative decay $B^0 \to K^{*0} \gamma$ proceeds through a FCNC, being sensitive to physics beyond the Standard Model that can modify the transition. A particularly interesting observable is the direct $CP$ asymmetry of this decay. Prior to the measurement of physical quantities, the detector ne...

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Autor principal: Vázquez Gómez, R
Lenguaje:eng
Publicado: 2013
Materias:
Acceso en línea:http://cds.cern.ch/record/1532444
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author Vázquez Gómez, R
author_facet Vázquez Gómez, R
author_sort Vázquez Gómez, R
collection CERN
description The radiative decay $B^0 \to K^{*0} \gamma$ proceeds through a FCNC, being sensitive to physics beyond the Standard Model that can modify the transition. A particularly interesting observable is the direct $CP$ asymmetry of this decay. Prior to the measurement of physical quantities, the detector needs to be calibrated to guarantee the maximum quality of the data. The calibration and alignment of the SPD sub-detector has been studied using cosmic rays and the first LHC collisions. The stability of the SPD efficiency due to the ageing of the detector has been monitored with 2011 data. The full 2011 data sample corresponding to 1 fb$^{-1}$ at a centre-of-mass energy of $7 \mathrm{TeV}$ has been used to study the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays, and it is measured to be $0.8 \pm 1.7(\mathrm{stat.})\pm 0.9(\mathrm{syst.})$. This result is compatible with the Standard Model prediction and improves by a 20 % the previous best measurement.
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institution Organización Europea para la Investigación Nuclear
language eng
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spelling cern-15324442019-09-30T06:29:59Zhttp://cds.cern.ch/record/1532444engVázquez Gómez, RMeasurement of the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays with the LHCb detectorParticle Physics - ExperimentThe radiative decay $B^0 \to K^{*0} \gamma$ proceeds through a FCNC, being sensitive to physics beyond the Standard Model that can modify the transition. A particularly interesting observable is the direct $CP$ asymmetry of this decay. Prior to the measurement of physical quantities, the detector needs to be calibrated to guarantee the maximum quality of the data. The calibration and alignment of the SPD sub-detector has been studied using cosmic rays and the first LHC collisions. The stability of the SPD efficiency due to the ageing of the detector has been monitored with 2011 data. The full 2011 data sample corresponding to 1 fb$^{-1}$ at a centre-of-mass energy of $7 \mathrm{TeV}$ has been used to study the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays, and it is measured to be $0.8 \pm 1.7(\mathrm{stat.})\pm 0.9(\mathrm{syst.})$. This result is compatible with the Standard Model prediction and improves by a 20 % the previous best measurement.CERN-THESIS-2012-292oai:cds.cern.ch:15324442013-03-26T13:10:12Z
spellingShingle Particle Physics - Experiment
Vázquez Gómez, R
Measurement of the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays with the LHCb detector
title Measurement of the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays with the LHCb detector
title_full Measurement of the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays with the LHCb detector
title_fullStr Measurement of the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays with the LHCb detector
title_full_unstemmed Measurement of the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays with the LHCb detector
title_short Measurement of the direct $CP$ asymmetry in $B^0 \to K^{*0} \gamma$ decays with the LHCb detector
title_sort measurement of the direct $cp$ asymmetry in $b^0 \to k^{*0} \gamma$ decays with the lhcb detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1532444
work_keys_str_mv AT vazquezgomezr measurementofthedirectcpasymmetryinb0tok0gammadecayswiththelhcbdetector