Testing lepton flavour universality in semileptonic Λb → Λ* c decays-Reference-Cited by-同舟云学术

Testing lepton flavour universality in semileptonic Λb → Λ* c decays

Published:2018-06 Issue:6 Volume:2018 Page:
ISSN:1029-8479
Container-title:Journal of High Energy Physics
language:en
Short-container-title:J. High Energ. Phys.

Author:

Böer Philipp,Bordone Marzia,Graverini Elena,Owen Patrick,Rotondo Marcello,van Dyk Danny

Abstract

Abstract Lepton Flavour Universality tests with semileptonic Λ b → Λ c * decays are important to corroborate the present anomalies in the similar ratios

$$ {R_D}_{{}^{\left(\ast \right)}} $$

R D ∗ , and can provide complementary constraints on possible origins of these anomalies beyond the Standard Model. In this paper we provide — for the first time — all the necessary theoretical ingredients to perform and interpret measurements of

$$ {R}_{\Lambda_c^{*}} $$

R Λ c * at the LHCb experiment. For this, we revisit the heavy-quark expansion of the relevant hadronic matrix elements, and provide their expressions to order α s and 1/m accuracy. Moreover, we study the sensitivity to the form factor parameters given the projected size and purity of upcoming and future LHCb datasets of

$$ {\Lambda}_b\to {\Lambda}_c^{*}\mu \overline{\nu} $$

Λ b → Λ c * μ ν ¯ decays. We demonstrate explicitly the need to perform a simultaneous fit to both Λ c * final states. Finally, we provide projections for the uncertainty of

$$ {R}_{\Lambda_c^{*}} $$

R Λ c * based on the form factors analysis from semimuonic decays and theoretical relations based on the heavy-quark expansion.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

Link

https://link.springer.com/content/pdf/10.1007/JHEP06(2018)155.pdf

Reference38 articles.

1. BaBar collaboration, J.P. Lees et al., Evidence for an excess of $$ \overline{B}\to {D}^{\left(\ast \right)}{\tau}^{-}{\overline{\nu}}_{\tau } $$ decays, Phys. Rev. Lett. 109 (2012) 101802 [arXiv:1205.5442] [INSPIRE].

2. BaBar collaboration, J.P. Lees et al., Measurement of an Excess of $$ \overline{B}\to {D}^{\left(\ast \right)}{\tau}^{-}{\overline{\nu}}_{\tau } $$ Decays and Implications for Charged Higgs Bosons, Phys. Rev. D 88 (2013) 072012 [arXiv:1303.0571] [INSPIRE].

3. Belle collaboration, M. Huschle et al., Measurement of the branching ratio of $$ \overline{B}\to {D}^{\left(\ast \right)}{\tau}^{-}{\overline{\nu}}_{\tau } $$ relative to $$ \overline{B}\to {D}^{\left(\ast \right)}{\ell}^{-}{\overline{\nu}}_{\ell } $$ decays with hadronic tagging at Belle, Phys. Rev. D 92 (2015) 072014 [arXiv:1507.03233] [INSPIRE].

4. LHCb collaboration, Measurement of the ratio of branching fractions $$ \mathrm{\mathcal{B}}\left({\overline{B}}^0\to {D}^{\ast +}{\tau}^{-}{\overline{\nu}}_{\tau}\right)/\mathrm{\mathcal{B}}\left({\overline{B}}^0\to {D}^{\ast +}{\mu}^{-}{\overline{\nu}}_{\mu}\right) $$, Phys. Rev. Lett. 115 (2015) 111803 [Erratum ibid. 115 (2015) 159901] [arXiv:1506.08614] [INSPIRE].

5. Belle collaboration, Y. Sato et al., Measurement of the branching ratio of $$ {\overline{B}}^0\to {D}^{\ast +}{\tau}^{-}{\overline{\nu}}_{\tau } $$ relative to $$ {\overline{B}}^0\to {D}^{\ast +}{\ell}^{-}{\overline{\nu}}_{\ell } $$ decays with a semileptonic tagging method, Phys. Rev. D 94 (2016) 072007 [arXiv:1607.07923] [INSPIRE].

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