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Testing lepton flavour universality in semileptonic $\Lambda_b \to \Lambda{_c}{^*}$ decays


Böer, Philipp; Bordone, Marzia; Graverini, Elena; Owen, Patrick; Rotondo, Marcello; van Dyk, Danny (2018). Testing lepton flavour universality in semileptonic $\Lambda_b \to \Lambda{_c}{^*}$ decays. Journal of High Energy Physics, 2018(6):155.

Abstract

Lepton Flavour Universality tests with semileptonic Λb → Λ c * decays are important to corroborate the present anomalies in the similar ratios RD(∗), 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 RΛ∗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 αs 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 Λb→Λ∗cμν¯¯¯ 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 RΛ∗c based on the form factors analysis from semimuonic decays and theoretical relations based on the heavy-quark expansion.

Abstract

Lepton Flavour Universality tests with semileptonic Λb → Λ c * decays are important to corroborate the present anomalies in the similar ratios RD(∗), 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 RΛ∗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 αs 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 Λb→Λ∗cμν¯¯¯ 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 RΛ∗c based on the form factors analysis from semimuonic decays and theoretical relations based on the heavy-quark expansion.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Nuclear and High Energy Physics
Language:English
Date:1 June 2018
Deposited On:30 Nov 2018 15:39
Last Modified:24 Sep 2019 23:54
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/jhep06(2018)155

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