Direct CP Violation in $B \rightarrow X_{s}\gamma$ Decays as a Signature of New Physics

We argue that the observation of a sizable direct CP asymmetry A_{CP} in the inclusive decays B -> X_s gamma would be a clean signal of New Physics. In the Standard Model, A_{CP} can be calculated reliably and is found to be below 1% in magnitude. In extensions of the Standard Model with new CP-v...

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Detalles Bibliográficos
Autores principales: Kagan, Alexander L., Neubert, Matthias
Lenguaje:eng
Publicado: 1998
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.58.094012
http://cds.cern.ch/record/349303
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author Kagan, Alexander L.
Neubert, Matthias
author_facet Kagan, Alexander L.
Neubert, Matthias
author_sort Kagan, Alexander L.
collection CERN
description We argue that the observation of a sizable direct CP asymmetry A_{CP} in the inclusive decays B -> X_s gamma would be a clean signal of New Physics. In the Standard Model, A_{CP} can be calculated reliably and is found to be below 1% in magnitude. In extensions of the Standard Model with new CP-violating couplings, large CP asymmetries are possible without conflicting with the experimental value of the branching ratio for the decays B -> X_s gamma. In particular, large asymmetries arise naturally in models with enhanced chromo-magnetic dipole operators. Some generic examples of such models are explored and their implications for the semileptonic branching ratio and charm yield in B decays discussed.
id cern-349303
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1998
record_format invenio
spelling cern-3493032023-03-14T18:00:29Zdoi:10.1103/PhysRevD.58.094012http://cds.cern.ch/record/349303engKagan, Alexander L.Neubert, MatthiasDirect CP Violation in $B \rightarrow X_{s}\gamma$ Decays as a Signature of New PhysicsParticle Physics - PhenomenologyWe argue that the observation of a sizable direct CP asymmetry A_{CP} in the inclusive decays B -> X_s gamma would be a clean signal of New Physics. In the Standard Model, A_{CP} can be calculated reliably and is found to be below 1% in magnitude. In extensions of the Standard Model with new CP-violating couplings, large CP asymmetries are possible without conflicting with the experimental value of the branching ratio for the decays B -> X_s gamma. In particular, large asymmetries arise naturally in models with enhanced chromo-magnetic dipole operators. Some generic examples of such models are explored and their implications for the semileptonic branching ratio and charm yield in B decays discussed.We argue that the observation of a sizable direct CP asymmetry A_{CP} in the inclusive decays B -> X_s gamma would be a clean signal of New Physics. In the Standard Model, A_{CP} can be calculated reliably and is found to be below 1% in magnitude. In extensions of the Standard Model with new CP-violating couplings, large CP asymmetries are possible without conflicting with the experimental value of the branching ratio for the decays B -> X_s gamma. In particular, large asymmetries arise naturally in models with enhanced chromo-magnetic dipole operators. Some generic examples of such models are explored and their implications for the semileptonic branching ratio and charm yield in B decays discussed.hep-ph/9803368CERN-TH-98-1UCHEP-98-7CERN-TH-98-001UCD-HEP-98-7oai:cds.cern.ch:3493031998-03-18
spellingShingle Particle Physics - Phenomenology
Kagan, Alexander L.
Neubert, Matthias
Direct CP Violation in $B \rightarrow X_{s}\gamma$ Decays as a Signature of New Physics
title Direct CP Violation in $B \rightarrow X_{s}\gamma$ Decays as a Signature of New Physics
title_full Direct CP Violation in $B \rightarrow X_{s}\gamma$ Decays as a Signature of New Physics
title_fullStr Direct CP Violation in $B \rightarrow X_{s}\gamma$ Decays as a Signature of New Physics
title_full_unstemmed Direct CP Violation in $B \rightarrow X_{s}\gamma$ Decays as a Signature of New Physics
title_short Direct CP Violation in $B \rightarrow X_{s}\gamma$ Decays as a Signature of New Physics
title_sort direct cp violation in $b \rightarrow x_{s}\gamma$ decays as a signature of new physics
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.58.094012
http://cds.cern.ch/record/349303
work_keys_str_mv AT kaganalexanderl directcpviolationinbrightarrowxsgammadecaysasasignatureofnewphysics
AT neubertmatthias directcpviolationinbrightarrowxsgammadecaysasasignatureofnewphysics

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