An improved Standard Model prediction of BR(B → τν) and its implications for New Physics UTfit Collaboration

被引：86

作者：

Bona, M. ^{[2
]}

Ciuchini, M. ^{[3
]}

Franco, E. ^{[1
]}

Lubicz, V. ^{[3
,4
]}

Martinelli, G. ^{[1
,5
]}

Parodi, F. ^{[6
,7
]}

Pierini, M. ^{[2
]}

Schiavi, C. ^{[6
,7
]}

Silvestrini, L. ^{[1
]}

Sordini, V. ^{[8
]}

Stocchi, A. ^{[9
,10
]}

Tarantino, C. ^{[3
,4
]}

Vagnoni, V. ^{[11
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[2] CERN, CH-1211 Geneva 23, Switzerland

[3] Ist Nazl Fis Nucl, Sez Roma Tre, I-00146 Rome, Italy

[4] Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy

[5] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[6] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[7] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[8] ETH, CH-8092 Zurich, Switzerland

[9] CNRS, IN2P3, Lab Accelerateur Lineaire, F-91898 Orsay, France

[10] Univ Paris Sud, F-91898 Orsay, France

[11] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy

来源：

PHYSICS LETTERS B | 2010年 / 687卷 / 01期

关键词：

Leptonic B decays; Unitarity Triangle analysis; Minimal Flavour Violation; Two-Higgs doublet models; Supersymmetry; CHARGED HIGGS BOSONS; UNITARITY TRIANGLE; CP-VIOLATION; SEARCH; QCD; DECAYS;

D O I：

10.1016/j.physletb.2010.02.063

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 f(B) and vertical bar V-ub vertical bar. 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) x 10(-4), to be compared with BR(B ->tau nu)(exp) = (1.73 +/- 0.34) x 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 tan it 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. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：61 / 69

页数：9

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