An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics

The recently measured B -> tau nu branching ratio allows to test the Standard Model by probing virtual effects of new heavy particles, such as a charged Higgs boson. The accuracy of the test is currently limited by the experimental error on BR(B -> tau nu) and by the uncertainty on the paramet...

Descripción completa

Detalles Bibliográficos
Autores principales: Bona, M., Ciuchini, M., Franco, E., Lubicz, V., Martinelli, G., Parodi, F., Pierini, M., Schiavi, C., Silvestrini, L., Sordini, V., Stocchi, A., Tarantino, C., Vagnoni, V.
Lenguaje:eng
Publicado: 2009
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2010.02.063
http://cds.cern.ch/record/1202446
_version_ 1780917710423588864
author Bona, M.
Ciuchini, M.
Franco, E.
Lubicz, V.
Martinelli, G.
Parodi, F.
Pierini, M.
Schiavi, C.
Silvestrini, L.
Sordini, V.
Stocchi, A.
Tarantino, C.
Vagnoni, V.
author_facet Bona, M.
Ciuchini, M.
Franco, E.
Lubicz, V.
Martinelli, G.
Parodi, F.
Pierini, M.
Schiavi, C.
Silvestrini, L.
Sordini, V.
Stocchi, A.
Tarantino, C.
Vagnoni, V.
author_sort Bona, M.
collection CERN
description The recently measured B -> tau nu branching ratio allows to test the Standard Model by probing virtual effects of new heavy particles, such as a charged Higgs boson. The accuracy of the test is currently limited by the experimental error on BR(B -> tau nu) and by the uncertainty on the parameters fB and |Vub|. The redundancy of the Unitarity Triangle fit allows to reduce the error on these parameters and thus to perform a more precise test of the Standard Model. Using the current experimental inputs, we obtain BR(B -> tau nu)_SM = (0.84 +- 0.11)x10^{-4}, to be compared with BR(B -> tau nu)_exp = (1.73 +- 0.34)x10^{-4}. The Standard Model prediction can be modified by New Physics effects in the decay amplitude as well as in the Unitarity Triangle fit. We discuss how to disentangle the two possible contributions in the case of minimal flavour violation at large tan beta and generic loop-mediated New Physics. We also consider two specific models with minimal flavour violation: the Type-II Two Higgs Doublet Model and the Minimal Supersymmetric Standard Model.
id cern-1202446
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2009
record_format invenio
spelling cern-12024462022-08-05T02:24:39Zdoi:10.1016/j.physletb.2010.02.063http://cds.cern.ch/record/1202446engBona, M.Ciuchini, M.Franco, E.Lubicz, V.Martinelli, G.Parodi, F.Pierini, M.Schiavi, C.Silvestrini, L.Sordini, V.Stocchi, A.Tarantino, C.Vagnoni, V.An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New PhysicsParticle Physics - PhenomenologyThe recently measured B -> tau nu branching ratio allows to test the Standard Model by probing virtual effects of new heavy particles, such as a charged Higgs boson. The accuracy of the test is currently limited by the experimental error on BR(B -> tau nu) and by the uncertainty on the parameters fB and |Vub|. The redundancy of the Unitarity Triangle fit allows to reduce the error on these parameters and thus to perform a more precise test of the Standard Model. Using the current experimental inputs, we obtain BR(B -> tau nu)_SM = (0.84 +- 0.11)x10^{-4}, to be compared with BR(B -> tau nu)_exp = (1.73 +- 0.34)x10^{-4}. The Standard Model prediction can be modified by New Physics effects in the decay amplitude as well as in the Unitarity Triangle fit. We discuss how to disentangle the two possible contributions in the case of minimal flavour violation at large tan beta and generic loop-mediated New Physics. We also consider two specific models with minimal flavour violation: the Type-II Two Higgs Doublet Model and the Minimal Supersymmetric Standard Model.The recently measured B→τν branching ratio allows to test the Standard Model by probing virtual effects of new heavy particles, such as a charged Higgs boson. The accuracy of the test is currently limited by the experimental error on BR(B→τν) and by the uncertainty on the parameters fB and |Vub| . The redundancy of the Unitarity Triangle fit allows to reduce the error on these parameters and thus to perform a more precise test of the Standard Model. Using the current experimental inputs, we obtain BR(B→τν)SM=(0.84±0.11)×10−4 , to be compared with BR(B→τν)exp=(1.73±0.34)×10−4 . The Standard Model prediction can be modified by New Physics effects in the decay amplitude as well as in the Unitarity Triangle fit. We discuss how to disentangle the two possible contributions in the case of minimal flavour violation at large tanβ and generic loop-mediated New Physics. We also consider two specific models with minimal flavour violation: the Type-II Two Higgs Doublet Model and the Minimal Supersymmetric Standard Model.The recently measured B -> tau nu branching ratio allows to test the Standard Model by probing virtual effects of new heavy particles, such as a charged Higgs boson. The accuracy of the test is currently limited by the experimental error on BR(B -> tau nu) and by the uncertainty on the parameters fB and |Vub|. The redundancy of the Unitarity Triangle fit allows to reduce the error on these parameters and thus to perform a more precise test of the Standard Model. Using the current experimental inputs, we obtain BR(B -> tau nu)_SM = (0.84 +- 0.11)x10^{-4}, to be compared with BR(B -> tau nu)_exp = (1.73 +- 0.34)x10^{-4}. The Standard Model prediction can be modified by New Physics effects in the decay amplitude as well as in the Unitarity Triangle fit. We discuss how to disentangle the two possible contributions in the case of minimal flavour violation at large tan beta and generic loop-mediated New Physics. We also consider two specific models with minimal flavour violation: the Type-II Two Higgs Doublet Model and the Minimal Supersymmetric Standard Model.arXiv:0908.3470oai:cds.cern.ch:12024462009-08-25
spellingShingle Particle Physics - Phenomenology
Bona, M.
Ciuchini, M.
Franco, E.
Lubicz, V.
Martinelli, G.
Parodi, F.
Pierini, M.
Schiavi, C.
Silvestrini, L.
Sordini, V.
Stocchi, A.
Tarantino, C.
Vagnoni, V.
An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
title An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
title_full An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
title_fullStr An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
title_full_unstemmed An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
title_short An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
title_sort improved standard model prediction of br(b -> tau nu) and its implications for new physics
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/j.physletb.2010.02.063
http://cds.cern.ch/record/1202446
work_keys_str_mv AT bonam animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT ciuchinim animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT francoe animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT lubiczv animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT martinellig animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT parodif animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT pierinim animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT schiavic animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT silvestrinil animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT sordiniv animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT stocchia animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT tarantinoc animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT vagnoniv animprovedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT bonam improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT ciuchinim improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT francoe improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT lubiczv improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT martinellig improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT parodif improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT pierinim improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT schiavic improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT silvestrinil improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT sordiniv improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT stocchia improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT tarantinoc improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics
AT vagnoniv improvedstandardmodelpredictionofbrbtaunuanditsimplicationsfornewphysics

Ejemplares similares