B- and D-meson semileptonic decays with highly improved staggered quarks

Conference · Tue Nov 09 04:00:00 EST 2021

OSTI ID:1833277

Jay, William I. ^[1]; Lytle, Andrew ^[2]; DeTar, Carleton ^[3]; El-Khadra, Aida ^[2]; Gamiz, Elvira ^[4]; Gelzer, Zechariah ^[2]; Gottlieb, Steven ^[5]; Kronfeld, Andreas ^[6]; Simone, Jim ^[6]; Vaquero, Alejandro ^[3]

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1. MIT; Fermilab
2. Illinois U., Urbana
3. Utah U.
4. CAFPE, Granada; Granada U., Theor. Phys. Astrophys.
5. Indiana U.
6. Fermilab

We present results for $$B_{(s)}$$- and $$D_{(s)}$$-meson semileptonic decays from ongoing calculations by the Fermilab Lattice and MILC Collaborations. Our calculation employs the highly improved staggered quark (HISQ) action for both sea and valence quarks and includes several ensembles with physical-mass up, down, strange, and charm quarks and lattice spacings ranging from $$a\approx0.15$$ fm down to 0.06 fm. At most lattice spacings, an ensemble with physical-mass light quarks is included. The use of the highly improved action, combined with the MILC Collaboration's gauge ensembles with lattice spacings down to $$a\approx0.042$$ fm, allows heavy valence quarks to be treated with the same discretization as the light and strange quarks. This unified treatment of the valence quarks allows (in some cases) for absolutely normalized currents, bypassing the need for perturbative matching, which has been a leading source of uncertainty in previous calculations of $$B$$-meson decay form factors by our collaboration. All preliminary form-factor results are blinded.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Contributing Organization: Fermilab Lattice; MILC
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1833277
• Report Number(s): MIT-CTP/5356; FERMILAB-CONF-21-623-SCD-T; arXiv:2111.05184; oai:inspirehep.net:1964596
• Country of Publication: United States
• Language: English