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Theoretical Status of $B \to X_{s} \gamma$ Decays
We review the theoretical understanding of the branching ratio and photon-energy spectrum in B -> Xs gamma decays at next-to-leading order in QCD, including consistently the effects of Fermi motion. For the Standard Model, we obtain B(B -> Xs gamma)=(3.29 +- 0.33)*10^{-4} for the total branchi...
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| Lenguaje: | eng |
| Publicado: |
1998
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| Acceso en línea: | http://cds.cern.ch/record/365030 |
| _version_ | 1780892864473989120 |
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| author | Neubert, Matthias |
| author_facet | Neubert, Matthias |
| author_sort | Neubert, Matthias |
| collection | CERN |
| description | We review the theoretical understanding of the branching ratio and photon-energy spectrum in B -> Xs gamma decays at next-to-leading order in QCD, including consistently the effects of Fermi motion. For the Standard Model, we obtain B(B -> Xs gamma)=(3.29 +- 0.33)*10^{-4} for the total branching ratio, and B(B -> Xs gamma)=(2.85+0.34-0.40)*10^{-4} if a cut E_gamma > 2.1 GeV is applied on the photon energy, as done in the recent CLEO analysis. A precise measurement of the photon spectrum would help reducing the theoretical uncertainty and yield important information on the momentum distribution of b quarks inside B mesons. |
| id | cern-365030 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 1998 |
| record_format | invenio |
| spelling | cern-3650302021-10-08T02:34:13Zhttp://cds.cern.ch/record/365030engNeubert, MatthiasTheoretical Status of $B \to X_{s} \gamma$ DecaysParticle Physics - PhenomenologyWe review the theoretical understanding of the branching ratio and photon-energy spectrum in B -> Xs gamma decays at next-to-leading order in QCD, including consistently the effects of Fermi motion. For the Standard Model, we obtain B(B -> Xs gamma)=(3.29 +- 0.33)*10^{-4} for the total branching ratio, and B(B -> Xs gamma)=(2.85+0.34-0.40)*10^{-4} if a cut E_gamma > 2.1 GeV is applied on the photon energy, as done in the recent CLEO analysis. A precise measurement of the photon spectrum would help reducing the theoretical uncertainty and yield important information on the momentum distribution of b quarks inside B mesons.We review the theoretical understanding of the branching ratio and photon-energy spectrum in B -> Xs gamma decays at next-to-leading order in QCD, including consistently the effects of Fermi motion. For the Standard Model, we obtain B(B -> Xs gamma)=(3.29 +- 0.33)*10^{-4} for the total branching ratio, and B(B -> Xs gamma)=(2.85+0.34-0.40)*10^{-4} if a cut E_gamma > 2.1 GeV is applied on the photon energy, as done in the recent CLEO analysis. A precise measurement of the photon spectrum would help reducing the theoretical uncertainty and yield important information on the momentum distribution of b quarks inside B mesons.hep-ph/9809377CERN-TH-98-301CERN-TH-98-301oai:cds.cern.ch:3650301998-09-15 |
| spellingShingle | Particle Physics - Phenomenology Neubert, Matthias Theoretical Status of $B \to X_{s} \gamma$ Decays |
| title | Theoretical Status of $B \to X_{s} \gamma$ Decays |
| title_full | Theoretical Status of $B \to X_{s} \gamma$ Decays |
| title_fullStr | Theoretical Status of $B \to X_{s} \gamma$ Decays |
| title_full_unstemmed | Theoretical Status of $B \to X_{s} \gamma$ Decays |
| title_short | Theoretical Status of $B \to X_{s} \gamma$ Decays |
| title_sort | theoretical status of $b \to x_{s} \gamma$ decays |
| topic | Particle Physics - Phenomenology |
| url | http://cds.cern.ch/record/365030 |
| work_keys_str_mv | AT neubertmatthias theoreticalstatusofbtoxsgammadecays |