$$B$$-Meson Semileptonic Form Factors on (2+1+1)-Flavor HISQ Ensembles
We report updates to an ongoing lattice-QCD calculation of the form factors for the semileptonic decays $$B \to \pi \ell \nu$$, $$B_s \to K \ell \nu$$, $$B \to \pi \ell^+ \ell^-$$, and $$B \to K \ell^+ \ell^-$$. The tree-level decays $$B_{(s)} \to \pi (K) \ell \nu$$ enable precise determinations of the CKM matrix element $$|V_{ub}|$$, while the flavor-changing neutral-current interactions $$B \to \pi (K) \ell^+ \ell^-$$ are sensitive to contributions from new physics. This work uses MILC's (2+1+1)-flavor HISQ ensembles at approximate lattice spacings between $0.057$ and $0.15$ fm, with physical sea-quark masses on four out of the seven ensembles. The valence sector is comprised of a clover $$b$$ quark (in the Fermilab interpretation) and HISQ light and $$s$$ quarks. We present preliminary results for the form factors $$f_0$$, $$f_+$$, and $$f_T$$, including studies of systematic errors.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- Fermilab Lattice; MILC
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1592140
- Report Number(s):
- arXiv:1912.13358; FERMILAB-CONF-19-647-T; oai:inspirehep.net:1773465
- Resource Relation:
- Conference: 37th International Symposium on Lattice Field Theory, Wuhan, Hubei, China, 06/16-06/22/2019
- Country of Publication:
- United States
- Language:
- English
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