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Title: $$B^0_{(s)}$$-mixing matrix elements from lattice QCD for the Standard Model and beyond

Abstract

We calculate—for the first time in three-flavor lattice QCD—the hadronic matrix elements of all five local operators that contribute to neutral B0- and Bs-meson mixing in and beyond the Standard Model. In this paper, we present a complete error budget for each matrix element and also provide the full set of correlations among the matrix elements. We also present the corresponding bag parameters and their correlations, as well as specific combinations of the mixing matrix elements that enter the expression for the neutral B-meson width difference. We obtain the most precise determination to date of the SU(3)-breaking ratio ξ=1.206(18)(6), where the second error stems from the omission of charm-sea quarks, while the first encompasses all other uncertainties. The threefold reduction in total uncertainty, relative to the 2013 Flavor Lattice Averaging Group results, tightens the constraint from B mixing on the Cabibbo-Kobayashi-Maskawa (CKM) unitarity triangle. Our calculation employs gauge-field ensembles generated by the MILC Collaboration with four lattice spacings and pion masses close to the physical value. We use the asqtad-improved staggered action for the light-valence quarks and the Fermilab method for the bottom quark. We use heavy-light meson chiral perturbation theory modified to include lattice-spacing effects to extrapolate the fivemore » matrix elements to the physical point. We combine our results with experimental measurements of the neutral B-meson oscillation frequencies to determine the CKM matrix elements |Vtd|=8.00(34)(8)×10-3, |Vts|=39.0(1.2)(0.4)×10-3, and |Vtd/Vts|=0.2052(31)(10), which differ from CKM-unitarity expectations by about 2σ. Lastly, these results and others from flavor-changing-neutral currents point towards an emerging tension between weak processes that are mediated at the loop and tree levels.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [4];  [7];  [8];  [9];  [10];  [11];  [6];  [12];  [13];  [12];  [14];  [15];  [12];  [12]
  1. Univ. of Iowa, Iowa City, IA (United States)
  2. Washington Univ., St. Louis, MO (United States)
  3. The College of William and Mary, Williamsburg, VA (United States)
  4. Univ. of Illinois, Urbana, IL (United States)
  5. Univ. of Utah, Salt Lake City, UT (United States)
  6. Syracuse Univ., Syracuse, NY (United States)
  7. School of the Art Institute of Chicago, Chicago, IL (United States)
  8. Univ. de Granada, Granada (Spain)
  9. Indiana Univ., Bloomington, IN (United States)
  10. American Physical Society, Ridge, NY (United States)
  11. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Technische Univ. Munchen, Garching (Germany)
  12. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  13. Univ. of Colorado, Boulder, CO (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  14. Univ. of California, Santa Barbara, CA (United States)
  15. Univ. of Arizona, Tucson, AZ (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). RIKEN Research Center
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
Fermilab Lattice; MILC; Fermilab Lattice and MILC Collaborations
OSTI Identifier:
1260383
Alternate Identifier(s):
OSTI ID: 1259736; OSTI ID: 1336071
Report Number(s):
FERMILAB-PUB-16-030-T; arXiv:1602.03560; BNL-112445-2016-JA
Journal ID: ISSN 2470-0010; PRVDAQ; 1421164
Grant/Contract Number:  
AC02-07CH11359; FG02-91ER40628; FC02-06ER41446; SC0010120; SC0010005; FG02-91ER40661; FG02-13ER42001; FG02-13ER41976; SC0012704; SC00112704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Riken BNL Research Center

Citation Formats

Bazavov, A., Bernard, C., Bouchard, C. M., Chang, C. C., DeTar, C., Du, Daping, El-Khadra, A. X., Freeland, E. D., Gamiz, E., Gottlieb, Steven, Heller, U. M., Kronfeld, A. S., Laiho, J., Mackenzie, P. B., Neil, E. T., Simone, J., Sugar, R., Toussaint, D., Van de Water, R. S., and Zhou, Ran. $B^0_{(s)}$-mixing matrix elements from lattice QCD for the Standard Model and beyond. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.93.113016.
Bazavov, A., Bernard, C., Bouchard, C. M., Chang, C. C., DeTar, C., Du, Daping, El-Khadra, A. X., Freeland, E. D., Gamiz, E., Gottlieb, Steven, Heller, U. M., Kronfeld, A. S., Laiho, J., Mackenzie, P. B., Neil, E. T., Simone, J., Sugar, R., Toussaint, D., Van de Water, R. S., & Zhou, Ran. $B^0_{(s)}$-mixing matrix elements from lattice QCD for the Standard Model and beyond. United States. https://doi.org/10.1103/PhysRevD.93.113016
Bazavov, A., Bernard, C., Bouchard, C. M., Chang, C. C., DeTar, C., Du, Daping, El-Khadra, A. X., Freeland, E. D., Gamiz, E., Gottlieb, Steven, Heller, U. M., Kronfeld, A. S., Laiho, J., Mackenzie, P. B., Neil, E. T., Simone, J., Sugar, R., Toussaint, D., Van de Water, R. S., and Zhou, Ran. 2016. "$B^0_{(s)}$-mixing matrix elements from lattice QCD for the Standard Model and beyond". United States. https://doi.org/10.1103/PhysRevD.93.113016. https://www.osti.gov/servlets/purl/1260383.
@article{osti_1260383,
title = {$B^0_{(s)}$-mixing matrix elements from lattice QCD for the Standard Model and beyond},
author = {Bazavov, A. and Bernard, C. and Bouchard, C. M. and Chang, C. C. and DeTar, C. and Du, Daping and El-Khadra, A. X. and Freeland, E. D. and Gamiz, E. and Gottlieb, Steven and Heller, U. M. and Kronfeld, A. S. and Laiho, J. and Mackenzie, P. B. and Neil, E. T. and Simone, J. and Sugar, R. and Toussaint, D. and Van de Water, R. S. and Zhou, Ran},
abstractNote = {We calculate—for the first time in three-flavor lattice QCD—the hadronic matrix elements of all five local operators that contribute to neutral B0- and Bs-meson mixing in and beyond the Standard Model. In this paper, we present a complete error budget for each matrix element and also provide the full set of correlations among the matrix elements. We also present the corresponding bag parameters and their correlations, as well as specific combinations of the mixing matrix elements that enter the expression for the neutral B-meson width difference. We obtain the most precise determination to date of the SU(3)-breaking ratio ξ=1.206(18)(6), where the second error stems from the omission of charm-sea quarks, while the first encompasses all other uncertainties. The threefold reduction in total uncertainty, relative to the 2013 Flavor Lattice Averaging Group results, tightens the constraint from B mixing on the Cabibbo-Kobayashi-Maskawa (CKM) unitarity triangle. Our calculation employs gauge-field ensembles generated by the MILC Collaboration with four lattice spacings and pion masses close to the physical value. We use the asqtad-improved staggered action for the light-valence quarks and the Fermilab method for the bottom quark. We use heavy-light meson chiral perturbation theory modified to include lattice-spacing effects to extrapolate the five matrix elements to the physical point. We combine our results with experimental measurements of the neutral B-meson oscillation frequencies to determine the CKM matrix elements |Vtd|=8.00(34)(8)×10-3, |Vts|=39.0(1.2)(0.4)×10-3, and |Vtd/Vts|=0.2052(31)(10), which differ from CKM-unitarity expectations by about 2σ. Lastly, these results and others from flavor-changing-neutral currents point towards an emerging tension between weak processes that are mediated at the loop and tree levels.},
doi = {10.1103/PhysRevD.93.113016},
url = {https://www.osti.gov/biblio/1260383}, journal = {Physical Review D},
issn = {2470-0010},
number = 11,
volume = 93,
place = {United States},
year = {Tue Jun 28 00:00:00 EDT 2016},
month = {Tue Jun 28 00:00:00 EDT 2016}
}

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Observation of B s 0 B ¯ s 0 Oscillations
journal, December 2006


Measurement of the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mtext>–</mml:mtext><mml:msubsup><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup></mml:math> oscillation frequency <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi mathvariant="normal">Δ</mml:mi><mml:msub><mml:mi>m</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:math> in <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>D</mml:mi><mml:mi>s</mml:mi><mml:mo>−</mml:mo></mml:msubsup><mml:mo stretchy="false">(</mml:mo><mml:mn>3</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mi>π</mml:mi></mml:math> decays
journal, March 2012


Precision Measurement of C P Violation in B S 0 J / Ψ K + K Decays
journal, January 2015


Search for time-dependent C P T violation in hadronic and semileptonic B decays
journal, April 2012


Measurements of the B +, B 0, $ B_s^0 $ meson and $ \Lambda_b^0 $ baryon lifetimes
journal, April 2014


Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set
journal, October 2012


Phenomenology of semileptonic B -meson decays with form factors from lattice QCD
journal, February 2016


Differential branching fractions and isospin asymmetries of B → K (*) μ + μ − decays
journal, June 2014


First measurement of the differential branching fraction and CP asymmetry of the B ± → π ± μ + μ − decay
journal, October 2015


B π l l Form Factors for New Physics Searches from Lattice QCD
journal, October 2015


Three-loop QCD corrections to B s → μ + μ −
journal, December 2013


Branching ratio measurements of B s decays
journal, July 2012


Probing New Physics via the B s 0 μ + μ Effective Lifetime
journal, July 2012


Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data
journal, May 2015


2000 CKM-triangle analysis a critical review with updated experimental inputs and theoretical parameters
journal, July 2001


A new approach to a global fit of the CKM matrix
journal, June 2001


Remark on the theoretical uncertainty in B0– mixing
journal, September 2002


B D ν form factors at nonzero recoil and | V c b | from 2 + 1 -flavor lattice QCD
journal, August 2015


ϵ K at next-to-next-to-leading order: The charm-top-quark contribution
journal, November 2010


Lattice QCD inputs to the CKM unitarity triangle analysis
journal, February 2010


Highly improved staggered quarks on the lattice with applications to charm physics
journal, March 2007


Properties and uses of the Wilson flow in lattice QCD
journal, August 2010


Erratum: Properties and uses of the Wilson flow in lattice QCD
journal, March 2014


High-precision scale setting in lattice QCD
journal, September 2012


Gradient flow and scale setting on MILC HISQ ensembles
journal, May 2016


Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks
journal, October 2014


Measurement of Form-Factor-Independent Observables in the Decay B 0 K * 0 μ + μ
journal, November 2013


Test of Lepton Universality Using B + K + + Decays
journal, October 2014


Implications of LHCb measurements and future prospects
text, January 2013


Continuum limit and improved action in lattice theories
journal, September 1983


Measurement of the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msubsup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup><mml:mo>→</mml:mo><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi><mml:msubsup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:math> branching fraction
journal, July 2012


Measurement of the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> production cross section in <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> collisions at <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext>TeV</mml:mtext></mml:math> using lepton+jets events with lifetime b-tagging
journal, October 2005


Review of Particle Physics
text, January 2012


Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data
text, January 2015


New lattice action for heavy quarks
text, January 2008


Quark flavour observables in the Littlest Higgs model with T-parity after LHC Run 1
text, January 2015


QCD Corrections to Flavor-Changing Neutral Currents in the Supersymmetric Standard Model
text, January 1997


Works referencing / citing this record:

Patterns of flavour violation in models with vector-like quarks
journal, April 2017


Identifying a Z behind b s anomalies at the LHC
journal, June 2018


Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016
journal, December 2017


Some results on lepton flavour universality violation
journal, July 2019


FLAG Review 2019
text, January 2019


Updated B s -mixing constraints on new physics models for b s + anomalies
journal, May 2018


| V u s | from K ℓ 3 decay and four-flavor lattice QCD
journal, June 2019


Heavy Physics Contributions to Neutrinoless Double Beta Decay from QCD
journal, October 2018


Gauging the accidental symmetries of the standard model, and implications for the flavor anomalies
text, January 2020


Flavor physics and flavor anomalies in minimal fundamental partial compositeness
journal, June 2018


FLAG Review 2019
text, January 2020


CP violation in the B system
journal, February 2017


FLAG Review 2019
text, January 2020


Neutral B-meson mixing from full lattice QCD at the physical point
text, January 2019


Flavor Physics and Flavor Anomalies in Minimal Fundamental Partial Compositeness
text, January 2017


Some results on Lepton Flavour Universality Violation
text, January 2018