Journal article
B → πll form factors for new physics searches from lattice QCD
Physical review letters, Vol.115(15), pp.152002-152002
10/07/2015
DOI: 10.1103/PhysRevLett.115.152002
PMID: 26550717
Abstract
The rare decay $B\to\pi\ell^+\ell^-$ arises from $b\to d$ flavor-changing neutral currents and could be sensitive to physics beyond the Standard Model. Here, we present the first $ab$-$initio$ QCD calculation of the $B\to\pi$ tensor form factor $f_T$. Together with the vector and scalar form factors $f_+$ and $f_0$ from our companion work [J. A. Bailey $et~al.$, Phys. Rev. D 92, 014024 (2015)], these parameterize the hadronic contribution to $B\to\pi$ semileptonic decays in any extension of the Standard Model. We obtain the total branching ratio ${\text{BR}}(B^+\to\pi^+\mu^+\mu^-)=20.4(2.1)\times10^{-9}$ in the Standard Model, which is the most precise theoretical determination to date, and agrees with the recent measurement from the LHCb experiment [R. Aaij $et~al.$, JHEP 1212, 125 (2012)]. Note added: after this paper was submitted for publication, LHCb announced a new measurement of the differential decay rate for this process [T. Tekampe, talk at DPF 2015], which we now compare to the shape and normalization of the Standard-Model prediction.
Details
- Title: Subtitle
- B → πll form factors for new physics searches from lattice QCD
- Creators
- C. M Bouchard - Ohio State UniversityJon A Bailey - Seoul National UniversityA Bazavov - University of IowaC Bernard - Washington University in St. LouisC Detar - University of UtahDaping Du - Syracuse UniversityA. X El-KhadraE. D Freeland - School of the Art Institute of ChicagoE Gámiz - Universidad de GranadaSteven Gottlieb - Indiana UniversityU. M Heller - American Physical SocietyA. S Kronfeld - Fermi National Accelerator LaboratoryJ Laiho - Syracuse UniversityL Levkova - University of UtahYuzhi Liu - University of Colorado BoulderE Lunghi - Indiana UniversityP. B Mackenzie - Fermi National Accelerator LaboratoryY Meurice - University of IowaE Neil - University of Colorado BoulderSi-Wei Qiu - University of UtahJ. N Simone - Fermi National Accelerator LaboratoryR Sugar - University of California, Santa BarbaraD Toussaint - University of ArizonaR. S WaterRan Zhou - Fermi National Accelerator LaboratoryMILC Collaboration
- Resource Type
- Journal article
- Publication Details
- Physical review letters, Vol.115(15), pp.152002-152002
- Publisher
- American Physical Society
- DOI
- 10.1103/PhysRevLett.115.152002
- PMID
- 26550717
- ISSN
- 0031-9007
- eISSN
- 1079-7114
- Grant note
- 1417805 / National Science Foundation (nsf_________::NSF) 303781 / European Commission (ec__________::EC) 291763 / European Commission (ec__________::EC) 1316748 / National Science Foundation (nsf_________::NSF) 1067881 / National Science Foundation (nsf_________::NSF)
- Language
- English
- Date published
- 10/07/2015
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984200047102771
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