Measurement of the branching fractions of radiative leptonic τ decays τ → lγν(ν)over-bar, (l = e, μ) at BABAR

被引：4
|
作者：
Oberhof, B. [1 ,2 ]
机构：
[1] Univ Pisa, Dipartimento Fis, Pisa, Italy
[2] Ist Nazl Fis Nucl, Lab Nazl, Frascati, Italy
来源：
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS | 2015年 / 260卷
关键词：
Tau lepton; Tau Decays; Tau Properties; MONTE-CARLO;
D O I：
10.1016/j.nuclphysbps.2015.02.003
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We perform a measurement of the branching fractions for tau --> l gamma nu(nu) over bar, (l = e, mu) decays for a minimum photon energy of 10 MeV in the tau rest frame using 430 fb(-1) of e(+)e(-) collisions collected at the center-of-mass energy of the Upsilon(4S) resonance with the BABAR detector at the PEP-II storage rings. We find B(tau --> mu gamma nu nu) = (3.69 +/- 0.03 +/- 0.10) x 10(-3) and B(tau --> e gamma nu nu) = (1.847 +/- 0.015 +/- 0.052) x 10(-2) where the first quoted error is statistical and the second is systematic. These results represent a substantial improvement with respect to existing measurements for both channels.
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页码：12 / 15
页数：4
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