B s → Kℓ v form factors with 2+1 flavors

Yuzhi Liu, Jon A. Bailey, A. Bazavov, C. Bernard, C. M. Bouchard, C. Detar, Daping Du, A. X. El-Khadra, E. D. Freeland, E. Gámiz, Z. Gelzer, Steven Gottlieb, U. M. Heller, A. S. Kronfeld, J. Laiho, P. B. Mackenzie, Y. Meurice, E. T. Neil, J. N. Simone, R. SugarD. Toussaint, R. S. Van De Water, Ran Zhou

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


Using the MILC 2+1 flavor asqtad quark action ensembles, we are calculating the form factors f0 and f+ for the semileptonic Bs → Kℓ v decay. A total of six ensembles with lattice spacing from ≈ 0.12 to 0.06 fm are being used. At the coarsest and finest lattice spacings, the light quark mass m'l is one-tenth the strange quark mass m's. At the intermediate lattice spacing, the ratio m'l/m's ranges from 0.05 to 0.2. The valence b quark is treated using the Sheikholeslami-Wohlert Wilson-clover action with the Fermilab interpretation. The other valence quarks use the asqtad action. When combined with (future) measurements from the LHCb and Belle II experiments, these calculations will provide an alternate determination of the CKM matrix element |Vub|.

Original languageEnglish
Article number13008
JournalEPJ Web of Conferences
Publication statusPublished - 2018 Mar 26
Event35th International Symposium on Lattice Field Theory, Lattice 2017 - Granada, Spain
Duration: 2017 Jun 182017 Jun 24

Bibliographical note

Funding Information:
Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the United States Department of Energy, Office of Science, Office of High Energy Physics. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.

Funding Information:
This work was supported in part by the U.S. Department of Energy under grants No. DE-AC05-06OR23177 (B.C.), No. DE-SC0010120 (S.G.), No. DE-SC0015655 (A.X.K.), No. DE(-)SC0009998 (J.L.), No. DE(-)SC0010113 (Y.M.), No. DE-SC0010005 (E.T.N.), No. DE-FG02-13ER41976 (D.T.), by the U.S. National Science Foundation under grants PHY14-17805 (D.D., J.L.), PHY12-12389 (Y.L.), PHY14-14614 (C.D.), and PHY13-16748 and PHY16-20625 (R.S.); by the Fermilab Distinguished Scholars Program (A.X.K.); by the German Excellence Initiative and the European Union Seventh Framework Program under grant agreement No. 291763 as well as the Eu-

Funding Information:
Acknowledgments: Computations for this work were carried out with resources provided by the USQCD Collaboration, the National Energy Research Scientific Computing Center and the Argonne Leadership Computing Facility, which are funded by the Office of Science of the U.S. Department of Energy; and with resources provided by the National Institute for Computational Science and the Texas Advanced Computing Center, which are funded through the National Science Foundation’s Teragrid/XSEDE Program.

Funding Information:
ropean Union’s Marie Curie COFUND program (A.S.K.), and by Spanish MINECO under grant No. FPA2013-47836-C3-1-P (E.G.). Y.L. was partially supported by the Blue Waters PAID program. The Blue Waters sustained-petascale computing project, which is supported by the National Science Foundation (awards OCI-0725070 and ACI-1238993) and the state of Illinois. Blue Waters is a joint effort of the University of Illinois at Urbana-Champaign and its National Center for Supercomputing Applications.

Publisher Copyright:
© The Authors, published by EDP Sciences, 2018.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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