Nonperturbative calculations of form factors for exclusive semileptonic B(s) decays

Jonathan M. Flynn, Ryan C. Hill, Andreas Jüttner, Amarjit Soni, J. Tobias Tsang, Oliver Witzel*


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Precise theoretical predictions derived from the Standard Model are a key ingredient in searches for new physics in the flavor sector. The large mass and long lifetime of the bquark make processes involving b quarks of particular interest. We use lattice simulations to perform nonperturbative QCD calculations for semileptonic B(s) decays. We present results from our determinations of Bs ? Dsl? and Bs ? Kl? semileptonic form factors and provide an outlook for our B ? pl? calculation. In addition we discuss the determination of R-ratios testing lepton-flavor universality and suggest use of an improved ratio. Our calculations are based on the set of 2+1 flavor domain wall Iwasaki gauge field configurations generated by the RBC-UKQCD collaboration featuring three lattice spacings of 1/a = 1.78, 2.38, and 2.79 GeV. Heavy b-quarks are simulated using the relativistic heavy quark action.

TidsskriftProceedings of Science
Antal sider6
StatusUdgivet - apr. 2021
Begivenhed40th International Conference on High Energy Physics, ICHEP 2020 - Virtual, Prague, Tjekkiet
Varighed: 28. jul. 20206. aug. 2020


Konference40th International Conference on High Energy Physics, ICHEP 2020
ByVirtual, Prague

Bibliografisk note

Funding Information:
We thank our RBC and UKQCD collaborators for helpful discussions and suggestions. Computations used resources provided by the USQCD Collaboration, funded by the Office of Science of the US Department of Energy and by the ARCHER UK National Supercomputing Service, as well as computers at Columbia University and Brookhaven National Laboratory. We used gauge field configurations generated on the DiRAC Blue Gene Q system at the University of Edinburgh, part of the DiRAC Facility, funded by BIS National E-infrastructure grant ST/K000411/1 and STFC grants ST/H008845/1, ST/K005804/1 and ST/K005790/1. This project has received funding from Marie Skłodowska-Curie grant 659322 (EU Horizon 2020), STFC grants ST/P000711/1 and

Funding Information:
ST/T000775/1. RH was supported by the DISCnet Centre for Doctoral Training (STFC grant ST/P006760/1). OW acknowledges support from DOE grant DE–SC0010005. AS was supported in part by US DOE contract DE–SC0012704. JTT acknowledges suppport from the Independent Research Fund Denmark, Research Project 1, grant 8021–00122. No new experimental data was generated. The project leading to this application has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 894103.

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).


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