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Contraint on the branching ration of B‾c→τ‾ν from LEP1 data and consequences for R(D(*)) anomaly

Contraint on the branching ration of B‾c→τ‾ν from LEP1 data and consequences for R(D(*)) anomaly
Contraint on the branching ration of B‾c→τ‾ν from LEP1 data and consequences for R(D(*)) anomaly
Recently there has been interest in the correlation between R(D∗) and the branching ratio (BR) of B−c→τ¯ν in models with a charged scalar H±. Any enhancement of R(D∗) by H± alone (in order to agree with current data) also enhances BR(B−c→τ¯ν), for which there has been no direct search at hadron colliders. We show that LEP data taken at the Z peak requires BR(B−c→τ¯ν)≲10%, and this constraint is significantly stronger than the recent constraint BR(B−c→τ¯ν)≲30% from considering the lifetime of Bc. In order to respect this new constraint, any explanation of the R(D) and R(D∗) anomaly in terms of H± alone would require the future measurements of R(D∗) to be even closer to the Standard Model prediction. A stronger limit on BR(B−c→τ¯ν) (or its first measurement) would be obtained if the L3 Collaboration used all its data taken at the Z peak.
1550-7998
Akeroyd, A.G.
e5de827d-7119-41c2-9f1e-5ef123afdf98
Chen, Chuan-Hung
a3e8c131-9f5f-49d8-98f6-8da4722b4a30
Akeroyd, A.G. and Chen, Chuan-Hung (2017) Contraint on the branching ration of B‾c→τ‾ν from LEP1 data and consequences for R(D(*)) anomaly Physical Review D (doi:10.1103/PhysRevD.96.075011).

Akeroyd, A.G. and Chen, Chuan-Hung (2017) Contraint on the branching ration of B‾c→τ‾ν from LEP1 data and consequences for R(D(*)) anomaly Physical Review D (doi:10.1103/PhysRevD.96.075011).

Record type: Article

Abstract

Recently there has been interest in the correlation between R(D∗) and the branching ratio (BR) of B−c→τ¯ν in models with a charged scalar H±. Any enhancement of R(D∗) by H± alone (in order to agree with current data) also enhances BR(B−c→τ¯ν), for which there has been no direct search at hadron colliders. We show that LEP data taken at the Z peak requires BR(B−c→τ¯ν)≲10%, and this constraint is significantly stronger than the recent constraint BR(B−c→τ¯ν)≲30% from considering the lifetime of Bc. In order to respect this new constraint, any explanation of the R(D) and R(D∗) anomaly in terms of H± alone would require the future measurements of R(D∗) to be even closer to the Standard Model prediction. A stronger limit on BR(B−c→τ¯ν) (or its first measurement) would be obtained if the L3 Collaboration used all its data taken at the Z peak.

Text Constraint on the branching ratio of B?? - Accepted Manuscript
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Accepted/In Press date: 25 September 2017
e-pub ahead of print date: 9 October 2017

Identifiers

Local EPrints ID: 414814
URI: http://eprints.soton.ac.uk/id/eprint/414814
ISSN: 1550-7998
PURE UUID: 39c4bea9-9f34-4a22-a040-3c85bad35e41

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Date deposited: 11 Oct 2017 16:31
Last modified: 01 Nov 2017 17:30

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Contributors

Author: A.G. Akeroyd
Author: Chuan-Hung Chen

University divisions

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