Journal
PHYSICAL REVIEW D
Volume 92, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.92.014024
Keywords
-
Funding
- Office of Science of the United States Department of Energy
- National Institute for Computational Science
- Pittsburgh Supercomputer Center
- San Diego Supercomputer Center
- Texas Advanced Computing Center
- National Science Foundation's Teragrid/XSEDE Program
- U.S. Department of Energy [DE-FG02-91ER40628, DE-FC02-12ER41879, DE-SC0010120, DE-FG02-91ER40661, DE-FC02-06ER41443, DE-FG02-13ER42001, DE-FG02-13ER41976, DE-SC0010114, DE-AC02-98CH10886, DE-AC02-07CH11359]
- National Science Foundation [PHY-1067881, PHY-10034278, PHY-1417805, PHY1212389, PHY-1316748]
- URA Visiting Scholars' program
- MINECO (Spain) [FPA2010-16696, FPA2006-05294]
- Ramon y Cajal program
- Junta de Andalucia (Spain) [FQM-101, FQM-6552]
- European Commission [PCIG10-GA-2011-303781]
- German Excellence Initiative
- European Union Seventh Framework Programme [291763]
- European Union's Marie Curie COFUND program
- Basic Science Research Program of the National Research Foundation of Korea (NRF)
- Ministry of Education [2014027937]
- Creative Research Initiatives Program of the NRF grant - Korean government (MEST) [2014001852]
- U.S. Department of Energy (DOE) [DE-SC0010114] Funding Source: U.S. Department of Energy (DOE)
- National Research Foundation of Korea [2013R1A1A2009149, 2009-0081564] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1067881, 1414614, 1316748] Funding Source: National Science Foundation
Ask authors/readers for more resources
We present a lattice-QCD calculation of the B -> pi l nu semileptonic form factors and a new determination of the CKM matrix element vertical bar V-ub vertical bar. We use the MILC asqtad (2 + 1)-flavor lattice configurations at four lattice spacings and light-quark masses down to 1/20 of the physical strange-quark mass. We extrapolate the lattice form factors to the continuum using staggered chiral perturbation theory in the hard-pion and SU (2) limits. We employ a model-independent z parametrization to extrapolate our lattice form factors from large-recoil momentum to the full kinematic range. We introduce a new functional method to propagate information from the chiral-continuum extrapolation to the z expansion. We present our results together with a complete systematic error budget, including a covariance matrix to enable the combination of our form factors with other lattice-QCD and experimental results. To obtain vertical bar V-ub vertical bar, we simultaneously fit the experimental data for the B -> pi l nu differential decay rate obtained by the BABAR and Belle collaborations together with our lattice form-factor results. We find vertical bar V-ub vertical bar = (3.72 +/- 0.16) x 10(-3), where the error is from the combined fit to lattice plus experiments and includes all sources of uncertainty. Our form-factor results bring the QCD error on vertical bar V-ub vertical bar to the same level as the experimental error. We also provide results for the B -> pi l nu vector and scalar form factors obtained from the combined lattice and experiment fit, which are more precisely determined than from our lattice-QCD calculation alone. These results can be used in other phenomenological applications and to test other approaches to QCD.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available