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$|V_{td}/V_{ts}|$ from $B\to V \gamma$
The dominant theoretical uncertainty in extracting |V_td/V_ts| from the ratio of branching ratios R=B(B->(rho,omega)gamma)/B(B-> K* gamma) is given by the ratio of form factors xi = T_1^{B->K*}(0)/T_1^{B-> \rho}(0). We re-examine xi in the framework of QCD sum rules on the light-cone, ta...
Autores principales: | , |
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Lenguaje: | eng |
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2006
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Acceso en línea: | https://dx.doi.org/10.1088/1126-6708/2006/04/046 http://cds.cern.ch/record/938926 |
_version_ | 1780909723239841792 |
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author | Ball, P Zwicky, R |
author_facet | Ball, P Zwicky, R |
author_sort | Ball, P |
collection | CERN |
description | The dominant theoretical uncertainty in extracting |V_td/V_ts| from the ratio of branching ratios R=B(B->(rho,omega)gamma)/B(B-> K* gamma) is given by the ratio of form factors xi = T_1^{B->K*}(0)/T_1^{B-> \rho}(0). We re-examine xi in the framework of QCD sum rules on the light-cone, taking into account hitherto neglected SU(3)-breaking effects. We find xi = 1.17\pm 0.09, which, using QCD factorisation for the branching ratios, and the experimental result for R obtained by the Belle collaboration, currently translates into |V_td/V_ts|= 0.207\pm 0.027(exp) \pm 0.016 (th). This result agrees with that obtained from the Standard Model unitarity triangle based on tree-level-only processes and with |V_td/V_ts| inferred from the two-sided bound on Delta m_s reported recently by the D0 collaboration. |
id | cern-938926 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2006 |
record_format | invenio |
spelling | cern-9389262019-09-30T06:29:59Zdoi:10.1088/1126-6708/2006/04/046http://cds.cern.ch/record/938926engBall, PZwicky, R$|V_{td}/V_{ts}|$ from $B\to V \gamma$Particle Physics - PhenomenologyThe dominant theoretical uncertainty in extracting |V_td/V_ts| from the ratio of branching ratios R=B(B->(rho,omega)gamma)/B(B-> K* gamma) is given by the ratio of form factors xi = T_1^{B->K*}(0)/T_1^{B-> \rho}(0). We re-examine xi in the framework of QCD sum rules on the light-cone, taking into account hitherto neglected SU(3)-breaking effects. We find xi = 1.17\pm 0.09, which, using QCD factorisation for the branching ratios, and the experimental result for R obtained by the Belle collaboration, currently translates into |V_td/V_ts|= 0.207\pm 0.027(exp) \pm 0.016 (th). This result agrees with that obtained from the Standard Model unitarity triangle based on tree-level-only processes and with |V_td/V_ts| inferred from the two-sided bound on Delta m_s reported recently by the D0 collaboration.hep-ph/0603232CERN-PH-TH-2006-050IPPP-2006-16oai:cds.cern.ch:9389262006-03-28 |
spellingShingle | Particle Physics - Phenomenology Ball, P Zwicky, R $|V_{td}/V_{ts}|$ from $B\to V \gamma$ |
title | $|V_{td}/V_{ts}|$ from $B\to V \gamma$ |
title_full | $|V_{td}/V_{ts}|$ from $B\to V \gamma$ |
title_fullStr | $|V_{td}/V_{ts}|$ from $B\to V \gamma$ |
title_full_unstemmed | $|V_{td}/V_{ts}|$ from $B\to V \gamma$ |
title_short | $|V_{td}/V_{ts}|$ from $B\to V \gamma$ |
title_sort | $|v_{td}/v_{ts}|$ from $b\to v \gamma$ |
topic | Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1088/1126-6708/2006/04/046 http://cds.cern.ch/record/938926 |
work_keys_str_mv | AT ballp vtdvtsfrombtovgamma AT zwickyr vtdvtsfrombtovgamma |