@article{080dba298810487c8963ea37e69b678d,
title = "gamma and psi leptonic decays as probes of solutions to the R (D (()*())) puzzle",
abstract = "Experimental measurements of the ratios R(D-(*())) equivalent to Gamma(B -> D-(*())tau upsilon)/Gamma(B -> D-(*())l upsilon) (l=rho, mu) show a 3.9 sigma deviation from the Standard Model prediction. In the absence of light right-handed neutrinos, a new physics contribution to b -> c tau nu decays necessarily modifies also b (b) over tilde ->tau(+)tau(-) and/or c (c) over tilde tau(+)tau(-) transitions. These contributions lead to violation of lepton flavor universality in, respectively, gamma and psi leptonic decays. We analyze the constraints resulting from measurements of the leptonic vector-meson decays on solutions to the R(D-(*())) puzzle. Available data from BaBar and Belle can already disfavor some of the new physics explanations of this anomaly. Further discrimination can be made by measuring gamma (1S, 2S, 3S)->tau tau in the upcoming Belle II experiment.",
keywords = "Beyond Standard Model, Heavy Quark Physics, Precision QED",
author = "Daniel Aloni and Aielet Efrati and Yuval Grossman and Yosef Nir",
note = "United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel [2014230]; I-CORE program of the Planning and Budgeting Committee; Israel Science Foundation [1937/12, 394/16]; NSF [PHY-1316222]; Minerva FoundationWe thank Avital Dery, Admir Greljo, Avner Soffer, Alexander Penin and Nadav Priel for useful discussions. We are thankful to Diptimoy Ghosh for his great help with the numerical evaluation of R(D<SUP>(</SUP>*<SUP>)</SUP>). This research is supported by the United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel (grant number 2014230), and by the I-CORE program of the Planning and Budgeting Committee and the Israel Science Foundation (grant number 1937/12). YG is supported in part by the NSF grant PHY-1316222. YN is the Amos de-Shalit chair of theoretical physics. YN is supported by grants from the Israel Science Foundation (grant number 394/16) and from the Minerva Foundation. We thank Avital Dery, Admir Greljo, Avner Soffer, Alexander Penin and Nadav Priel for useful discussions. We are thankful to Diptimoy Ghosh for his great help with the numerical evaluation of R(D<SUP>(</SUP>*<SUP>)</SUP>). This research is supported by the United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel (grant number 2014230), and by the I-CORE program of the Planning and Budgeting Committee and the Israel Science Foundation (grant number 1937/12). YG is supported in part by the NSF grant PHY-1316222. YN is the Amos de-Shalit chair of theoretical physics. YN is supported by grants from the Israel Science Foundation (grant number 394/16) and from the Minerva Foundation.",
year = "2017",
month = jun,
day = "5",
doi = "https://doi.org/10.1007/JHEP06(2017)019",
language = "الإنجليزيّة",
volume = "2017",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer Verlag",
number = "6",
}