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Current status of the standard model CKM fit and constraints on ΔF=2 new physics

J. Charles, O. Deschamps, S. Descotes-Genon, H. Lacker, A. Menzel, S. Monteil, V. Niess, J. Ocariz, J. Orloff, A. Perez, W. Qian, V. Tisserand, K. Trabelsi, P. Urquijo, and L. Vale Silva (CKMfitter Group)
Phys. Rev. D 91, 073007 – Published 9 April 2015
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  • INTRODUCTION
  • INPUTS FOR THE SM GLOBAL FIT
  • RESULTS OF THE SM GLOBAL FIT
  • NEW PHYSICS IN ΔF=2
  • CONCLUSION
  • ACKNOWLEDGMENTS
    • References

    Abstract

    This article summarizes the status of the global fit of the Cabibbo-Kobayashi-Maskawa (CKM) parameters within the Standard Model performed by the CKMfitter group. Special attention is paid to the inputs for the CKM angles α and γ and the status of Bs→μμ and Bd→μμ decays. We illustrate the current situation for other unitarity triangles. We also discuss the constraints on generic ΔF=2 new physics. All results have been obtained with the CKMfitter analysis package, featuring the frequentist statistical approach and using Rfit to handle theoretical uncertainties.

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    • Received 29 January 2015

    DOI:https://doi.org/10.1103/PhysRevD.91.073007

    © 2015 American Physical Society

    Authors & Affiliations

    J. Charles1, O. Deschamps2, S. Descotes-Genon3, H. Lacker4, A. Menzel4, S. Monteil2, V. Niess2, J. Ocariz5, J. Orloff2, A. Perez6, W. Qian7, V. Tisserand7, K. Trabelsi8,9, P. Urquijo10, and L. Vale Silva3 (CKMfitter Group)

    • 1Aix Marseille Université, Université de Toulon, CNRS, CPT UMR 7332, 13288 Marseille, France
    • 2Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, 63170 Aubière, Clermont-Ferrand, France
    • 3Laboratoire de Physique Théorique Bâtiment 210, Université Paris-Sud, F-91405 Orsay Cedex, France (UMR 8627 du CNRS associée à l’Université Paris-Sud)
    • 4Humboldt-Universität zu Berlin, Institut für Physik, Newtonstrasse 15, D-12489 Berlin, Germany
    • 5Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie Paris 6 et Université Denis Diderot Paris 7, F-75252 Paris, France
    • 6Institut Pluridisciplinaire Hubert Curien, 23 rue du loess - BP28, 67037 Strasbourg cedex 2, France
    • 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)
    • 8High Energy Accelerator Research Organization, KEK 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
    • 9Ecole Polytechnique Fédérale de Lausanne (EPFL), Bâtiment des Sciences Physiques, CH-1015 Lausanne, Switzerland
    • 10School of Physics, University of Melbourne, Victoria 3010, Australia

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    Issue

    Vol. 91, Iss. 7 — 1 April 2015

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    Images

    • Figure 1
      Figure 1

      Inputs for α used in the SM global fit. We show the world averages for ππ, ρπ and ρρ separately.

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    • Figure 2
      Figure 2

      Inputs for γ used in the SM global fit (top). We show the world averages for the different methods, in the (γ,δB) (middle) and (γ,rB) (bottom) planes. Shaded areas (dashed lines) enclose points with 1−p<68.3% (95.45%).

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    • Figure 3
      Figure 3

      Constraint obtained for the rB parameter of the B→DK*0 mode. “LHCb (DK*0)” (dot-dashed line) includes only data from DK*0, whereas “LHCb” (dashed line) involves all channels (including DK*0).

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    • Figure 4
      Figure 4

      Constraints on the CKM (ρ¯M,η¯M) coordinates with M=db,sb,ds,ct,ut,uc, from the global SM CKM fit. Regions outside the colored areas have 1−p>95.45%. For the combined fit the yellow area inscribed by the contour line represents points with 1−p<95.45%. The shaded area inside this region represents points with 1−p<68.3%.

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    • Figure 5
      Figure 5

      Pulls for the SM global fit obtained by comparing the value of χmin2 with and without including the measurement of the quantity. Notice that the different pulls are not necessarily independent.

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    • Figure 6
      Figure 6

      Constraints on the CKM (ρ¯,η¯) coordinates from the global SM CKM fit using only exclusive (top) and inclusive (bottom) determinations of |Vub| and |Vcb| from semileptonic decays as inputs.

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    • Figure 7
      Figure 7

      Prediction on B(B→τν) and sin2β coming from the global fit (without the corresponding inputs) compared to current experimental information (cross). Regions outside the colored areas are excluded at 1−p>95.45%.

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    • Figure 8
      Figure 8

      Prediction of the two dileptonic branching ratios B(Bs→μμ) and B(Bd→μμ) coming from the global fit (without input on dileptonic branching ratios) compared to current experimental information [18]. B(Bs→μμ) is shown removing the (1+ys)=1.07 increase due to time integration. The NNLO computation in Ref. [28] is indicated in colors, whereas the NLO computation used in Ref. [38] is the region delimited by the dashed line. Regions outside the colored areas are excluded at 1−p>95.45%. The oval contours are the experimental 1,2,3,…,σ confidence regions [18].

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    • Figure 9
      Figure 9

      Combined constraint on 2β+γ using relevant observables measured in the B→Dπ,D*π (top) and Dρ (bottom) decays.

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    • Figure 10
      Figure 10

      Complex parameters Δd (up) and Δs (down) in Scenario I, not including ASL. The colored areas represent regions with 1−p<68.3% for the individual constraints (αexp≡α−ϕdΔ/2). The red area shows the region with 1−p<68.3% for the combined fit, with the two additional contours delimiting the regions with 1−p<95.45% and 1−p<99.73%.

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    • Figure 11
      Figure 11

      Complex parameters Δd (up) and Δs (down) in Scenario I, including ASL. The conventions are the same as in Fig. 10.

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