Measuring the breaking of lepton flavor universality in B →k∗

Nicola Serra; Rafael Silva Coutinho; Danny Van Dyk

doi:10.1103/PhysRevD.95.035029

Measuring the breaking of lepton flavor universality in B →k∗

Nicola Serra, Rafael Silva Coutinho, Danny Van Dyk

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40 Scopus citations

Abstract

We propose measurements of weighted differences of the angular observables in the rare decays B→K∗+-. The proposed observables are very sensitive to the difference between the Wilson coefficients C9(e) and C9(μ) for decays into electrons and muons, respectively. At the same time, the charm-induced hadronic contributions are kinematically suppressed to 7%(4%) in the region 1 GeV2≤q2≤6 GeV2, as long as lepton-flavor universality breaking occurs only in C9(). This suppression becomes stronger for the region of low hadronic recoil, q2≥15 GeV2.

Original language	English (US)
Article number	035029
Journal	Physical Review D
Volume	95
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.95.035029
State	Published - Feb 23 2017
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Measuring the breaking of lepton flavor universality in B →k∗",

abstract = "We propose measurements of weighted differences of the angular observables in the rare decays B→K∗+-. The proposed observables are very sensitive to the difference between the Wilson coefficients C9(e) and C9(μ) for decays into electrons and muons, respectively. At the same time, the charm-induced hadronic contributions are kinematically suppressed to 7%(4%) in the region 1 GeV2≤q2≤6 GeV2, as long as lepton-flavor universality breaking occurs only in C9(). This suppression becomes stronger for the region of low hadronic recoil, q2≥15 GeV2.",

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AU - Coutinho, Rafael Silva

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N2 - We propose measurements of weighted differences of the angular observables in the rare decays B→K∗+-. The proposed observables are very sensitive to the difference between the Wilson coefficients C9(e) and C9(μ) for decays into electrons and muons, respectively. At the same time, the charm-induced hadronic contributions are kinematically suppressed to 7%(4%) in the region 1 GeV2≤q2≤6 GeV2, as long as lepton-flavor universality breaking occurs only in C9(). This suppression becomes stronger for the region of low hadronic recoil, q2≥15 GeV2.

AB - We propose measurements of weighted differences of the angular observables in the rare decays B→K∗+-. The proposed observables are very sensitive to the difference between the Wilson coefficients C9(e) and C9(μ) for decays into electrons and muons, respectively. At the same time, the charm-induced hadronic contributions are kinematically suppressed to 7%(4%) in the region 1 GeV2≤q2≤6 GeV2, as long as lepton-flavor universality breaking occurs only in C9(). This suppression becomes stronger for the region of low hadronic recoil, q2≥15 GeV2.

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Measuring the breaking of lepton flavor universality in B →k∗

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