• Open Access

Footprints of new physics in bcτν transitions

Zhuo-Ran Huang, Ying Li, Cai-Dian Lu, M. Ali Paracha, and Chao Wang
Phys. Rev. D 98, 095018 – Published 26 November 2018

Abstract

In this work, we perform a combined analysis of the R(D), R(D*), and R(J/ψ) anomalies in a model-independent manner based on the general framework of the four-fermion effective field theory, paying special attention to the use of the hadronic form factors. For the BD(D*) transition form factors, we use the heavy quark field theory parametrization which includes the higher-order corrections of O(αs,ΛQCD/mb,c) and was determined recently from a fit to lattice QCD and light-cone sum rule results in complementary kinematical regions of the momentum transfer. For the BcJ/ψ(ηc) transitions, we use the form factors calculated in the covariant light-front quark model, which are found to be well consistent with the preliminary lattice results. With this particular treatment of hadronic matrix elements, in our analysis the two classes of vector operators are shown to be the most favored single new physics (NP) operators by the current experimental constraints within 2σ and the LEP1 data on Br(Bcτν) as well as the minimum χ2 fit, while the tensor operator is also allowed but severely constrained, and the scalar ones are excluded. Using the favored ranges and fitted values of the Wilson coefficients of the single NP operators, we also give a prognosis for the physical observables, such as the ratios of decay rates (R(D(D*)), R(J/ψ(ηc))) and other polarized observables as well as the q2 distributions.

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  • Received 16 August 2018

DOI:https://doi.org/10.1103/PhysRevD.98.095018

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Zhuo-Ran Huang1,*, Ying Li2,†, Cai-Dian Lu1,‡, M. Ali Paracha3,1,§, and Chao Wang1,∥

  • 1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2Department of Physics, Yantai University, Yantai 264005, China
  • 3Department of Physics, School of Natural Sciences (SNS), National University of Sciences and Technology (NUST), Sector H-12 Islamabad, Pakistan

  • *huangzr@ihep.ac.cn
  • liying@ytu.edu.cn
  • lucd@ihep.ac.cn
  • §aliphoton9@gmail.com
  • wangchao88@ihep.ac.cn

Article Text

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Issue

Vol. 98, Iss. 9 — 1 November 2018

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