Constraints on new physics in $B\ensuremath{-}\overline{B}$ mixing in the light of recent LHCb data

Constraints on new physics in $B - \bar{B}$ mixing in the light of recent LHCb data

A. Lenz, U. Nierste, J. Charles, S. Descotes-Genon, H. Lacker, S. Monteil, V. Niess, and S. T’Jampens (CKMfitter Group)

Phys. Rev. D 86, 033008 – Published 15 August 2012

Abstract

We perform model-independent statistical analyses of three scenarios accommodating new physics (NP) in $Δ F = 2$ flavor-changing neutral current amplitudes. In a scenario in which NP in $B_{d} - {\bar{B}}_{d}$ mixing and $B_{s} - {\bar{B}}_{s}$ mixing is uncorrelated, we find the parameter point representing the standard model disfavored by 2.4 standard deviations. However, recent LHCb data on $B_{s}$ neutral meson mixing forbid a good accommodation of the DØ data on the semileptonic $C P$ asymmetry $A_{SL}$ . We introduce a fourth scenario with NP in both $M_{12}^{d, s}$ and $Γ_{12}^{d, s}$ , which can accommodate all data. We discuss the viability of this possibility and emphasize the importance of separate measurements of the $C P$ asymmetries in semileptonic $B_{d}$ and $B_{s}$ decays. All results have been obtained with the CKMfitter analysis package, featuring the frequentist statistical approach and using Rfit to handle theoretical uncertainties.

Received 24 April 2012

DOI:https://doi.org/10.1103/PhysRevD.86.033008

Authors & Affiliations

A. Lenz^1,*, U. Nierste^2,†, J. Charles^3,‡, S. Descotes-Genon^4,§, H. Lacker^5,∥, S. Monteil^6,¶, V. Niess^6,**, and S. T’Jampens^7,†† (CKMfitter Group)

¹CERN—Theory Division, PH-TH, Case C01600, CH-1211 Geneva 23, Switzerland
²Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany
³Centre de Physique Théorique, Aix-Marseille Université, CNRS UMR 7332, Université Sud Toulon Var, F-13288 Marseille cedex 9, France
⁴Laboratoire de Physique Théorique, Bâtiment 210, Université Paris-Sud 11, F-91405 Orsay Cedex, France (UMR 8627 du CNRS associée à l’Université Paris-Sud 11)
⁵Humboldt-Universität zu Berlin, Institut für Physik, Newtonstraße 15, D-12489 Berlin, Germany
⁶Laboratoire de Physique Corpusculaire de Clermont-Ferrand, Université Blaise Pascal, 24 Avenue des Landais, F-63177 Aubiere Cedex, France (UMR 6533 du CNRS-IN2P3 associée à l’Université Blaise Pascal)
⁷Laboratoire d’Annecy-Le-Vieux de Physique des Particules, 9 Chemin de Bellevue, BP 110, F-74941 Annecy-le-Vieux Cedex, France (UMR 5814 du CNRS-IN2P3 associée à l’Université de Savoie)

^*alenz@cern.ch
^†nierste@particle.uni-karlsruhe.de
^‡charles@cpt.univ-mrs.fr
^§Sebastien.Descotes-Genon@th.u-psud.fr
^∥lacker@physik.hu-berlin.de
^¶monteil@in2p3.fr
^**niess@in2p3.fr
^††tjamp@lapp.in2p3.fr

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Vol. 86, Iss. 3 — 1 August 2012

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Physical Review D

covering particles, fields, gravitation, and cosmology

Constraints on new physics in $B - \bar{B}$ mixing in the light of recent LHCb data

A. Lenz, U. Nierste, J. Charles, S. Descotes-Genon, H. Lacker, S. Monteil, V. Niess, and S. T’Jampens (CKMfitter Group)

Phys. Rev. D 86, 033008 – Published 15 August 2012

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Physical Review D

covering particles, fields, gravitation, and cosmology

Constraints on new physics in B−B¯ mixing in the light of recent LHCb data

A. Lenz, U. Nierste, J. Charles, S. Descotes-Genon, H. Lacker, S. Monteil, V. Niess, and S. T’Jampens (CKMfitter Group)

Phys. Rev. D 86, 033008 – Published 15 August 2012

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Constraints on new physics in $B - \bar{B}$ mixing in the light of recent LHCb data