Exploring Lepton Non-universality in \(b \rightarrow c l \bar{\nu }_l\) Decay Modes in the Light of Recent Experimental Data

  • Suchismita SahooEmail author
  • Rukmani Mohanta
  • Anjan K. Giri
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 234)


The observation of lepton non-universality in B sector has become a challenge for universality lovers. Recently, the LHCb Collaboration has added a new \(R_{J/\psi }\) ratio into this challenging area, which has a \(2\sigma \) deviation from its standard model prediction. In this regard, we present a model independent analysis of \(b \rightarrow c l \bar{\nu }_l\) decays in order to scrutinize the presence of lepton universality violation in B sector. We first perform a global fit to \(R_{D^{(*)}}\) data. We then estimate the lepton non-universality parameters of \(B_c \rightarrow (\eta _c, J/\psi ) l \nu _l\) and \(B_s \rightarrow D_s^{(*)} l \bar{\nu }_l\) decay processes.


Lepton non-universality Global fit 



SS and RM acknowledge the financial support from SERB, Govt. of India.


  1. 1.
    Y. Amhis et al., Heavy flavor averaging group. Eur. Phys. J. C 77, 895 (2017).
  2. 2.
    H. Na et al., Phys. Rev. D 92, 054410 (2015). Scholar
  3. 3.
    S. Fajfer, J.F. Kamenik, I. Nisandzic, J. Zupan, Phys. Rev. Lett. 109, 161801 (2012).
  4. 4.
    R. Aaij et al., LHCb. Phys. Rev. Lett. 120, 121801 (2018).
  5. 5.
    W.-F. Wang, Y.-Y. Fan, Z.-J. Xiao, Chin. Phys. C 37, 093102 (2013). Scholar
  6. 6.
    V. Cirigliano, J. Jenkins, M. Gonzalez-Alonso, Nucl. Phys. B 830, 95 (2010). Scholar
  7. 7.
    C. Patrignani et al., Particle data group. Chin. Phys. C 40, 100001 (2016). Scholar
  8. 8.
    M. Tanaka, R. Watanabe, Phys. Rev. D 87, 034028 (2013).; F. Wang, Y.Y. Fan, Z.J. Xiao, Chin. Phys. C 37, 093102 (2013).; C.J. Monahan, H. Na, C.M. Bouchard, G.P. Lepage, J. Shigemitsu, Phys. Rev. D 95(11), 114506 (2017).

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Suchismita Sahoo
    • 1
    Email author
  • Rukmani Mohanta
    • 2
  • Anjan K. Giri
    • 3
  1. 1.Physical Research LaboratoryTHEPH DivisionAhmedabadIndia
  2. 2.School of PhysicsUniversity of HyderabadHyderabadIndia
  3. 3.Department of PhysicsIIT HyderabadKandiIndia

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