Probing New Physics via the Bs0μ+μ Effective Lifetime

Kristof De Bruyn, Robert Fleischer, Robert Knegjens, Patrick Koppenburg, Marcel Merk, Antonio Pellegrino, and Niels Tuning
Phys. Rev. Lett. 109, 041801 – Published 25 July 2012

Abstract

We have recently seen new upper bounds for Bs0μ+μ, a key decay to search for physics beyond the standard model. Furthermore a nonvanishing decay width difference ΔΓs of the Bs system has been measured. We show that ΔΓs affects the extraction of the Bs0μ+μ branching ratio and the resulting constraints on the new physics parameter space and give formulas for including this effect. Moreover, we point out that ΔΓs provides a new observable, the effective Bs0μ+μ lifetime τμ+μ, which offers a theoretically clean probe for new physics searches that is complementary to the branching ratio. Should the Bs0μ+μ branching ratio agree with the standard model, the measurement of τμ+μ, which appears feasible at upgrades of the Large Hadron Collider experiments, may still reveal large new physics effects.

  • Figure
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  • Received 12 April 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.041801

© 2012 American Physical Society

Authors & Affiliations

Kristof De Bruyn1, Robert Fleischer1,2, Robert Knegjens1, Patrick Koppenburg1, Marcel Merk1,2, Antonio Pellegrino1, and Niels Tuning1

  • 1Nikhef, Science Park 105, NL-1098 XG Amsterdam, Netherlands
  • 2Department of Physics and Astronomy, Vrije Universiteit Amsterdam, NL-1081 HV Amsterdam, Netherlands

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Issue

Vol. 109, Iss. 4 — 27 July 2012

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