Bs → Kℓv form factors with 2+1 flavors

Lattice, Fermilab; Collaborations, Milc; Liu, Yuzhi; Bailey, Jon A.; Bazavov, A.; Bérnard, C.; Bouchard, C.; DeTar, Carleton; Du, Daping; El‐Khadra, Aida X.; Freeland, E. D.; Gámiz, E.; Gelzer, Zechariah; Gottlieb, Steven; Heller, Urs M.; Kronfeld, A. S.; Laiho, J.; Mackenzie, Paul B.; Meurice, Yannick; Neil, Ethan T.; Simone, J. N.; Sugar, R.; Toussaint, D.; Water, Ruth S. Van de; Zhou, R.

doi:10.1051/epjconf/201817513008

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…HPQCD has recently emphasized the value of form factor ratios for the processes B s → Kℓν and B s → D s ℓν for determination of |V ub /V cb | [584]. Preliminary results from FNAL/MILC have been reported for N f = 2 + 1 [585] and N f = 2 + 1 + 1 [581]. Archival papers are expected soon.…”

Section: Form Factors For B S → Kℓνmentioning

confidence: 99%

FLAG Review 2019

Aoki,

Becirevic

et al. 2019

Preprint

Self Cite

133

250

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We review lattice results related to pion, kaon, D-meson, B-meson, and nucleon physics with the aim of making them easily accessible to the nuclear and particle physics communities. More specifically, we report on the determination of the light-quark masses, the form factor f + (0) arising in the semileptonic K → π transition at zero momentum transfer, as well as the decay constant ratio f K /f π and its consequences for the CKM matrix elements V us and V ud . Furthermore, we describe the results obtained on the lattice for some of the low-energy constants of SU (2) L × SU (2) R and SU (3) L × SU (3) R Chiral Perturbation Theory. We review the determination of the B K parameter of neutral kaon mixing as well as the additional four B parameters that arise in theories of physics beyond the Standard Model. For the heavy-quark sector, we provide results for m c and m b as well as those for D-and B-meson decay constants, form factors, and mixing parameters. These are the heavy-quark quantities most relevant for the determination of CKM matrix elements and the global CKM unitarity-triangle fit. We review the status of lattice determinations of the strong coupling constant α s . Finally, in this review we have added a new section reviewing results for nucleon matrix elements of the axial, scalar and tensor bilinears, both isovector and flavor diagonal.

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Section: Form Factors For B S → Kℓνmentioning

confidence: 99%

FLAG Review 2019

Aoki,

Becirevic

et al. 2019

Preprint

Self Cite

133

250

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show abstract

“…At this conference, there have been presentations on the heavy-to-light form factor calculations by Fermilab/MILC (Gelzer et al [38], see also [39,40] for preliminary results at Lattice 2017), RBC/UKQCD (Witzel et al [41]), JLQCD (Colquhoun et al [42], see also [43]), HPQCD (Bouchard et al [44], see also [45] for a full paper), as well as ETM (Riggio et al [46], see also [47] for a full paper).…”

Section: Heavy-to-light Decaysmentioning

confidence: 99%

Hints and challenges in heavy flavor physics

Hashimoto¹

2019

Proceedings of the 36th Annual International Symposium on Lattice Field Theory — PoS(LATTICE2018)

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“…Preliminary reports on this study can be found in Refs. [37,38], where the vector current renormalization factors were still multiplied by a blinding factor. This factor was disclosed only after the analysis was finalized.…”

Section: Introductionmentioning

confidence: 99%

Bs→Kℓν decay from lattice QCD

Collaborations

2019

Phys. Rev. D

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We use lattice QCD to calculate the form factors f þ ðq 2 Þ and f 0 ðq 2 Þ for the semileptonic decay B s → Klν. Our calculation uses six MILC asqtad 2 þ 1 flavor gauge-field ensembles with three lattice spacings. At the smallest and largest lattice spacing the light-quark sea mass is set to 1=10 the strange-quark mass. At the intermediate lattice spacing, we use four values for the light-quark sea mass ranging from 1=5 to 1=20 of the strange-quark mass. We use the asqtad improved staggered action for the light valence quarks, and the clover action with the Fermilab interpolation for the heavy valence bottom quark. We use SU(2) hard-kaon heavy-meson rooted staggered chiral perturbation theory to take the chiral-continuum limit. A functional z expansion is used to extend the form factors to the full kinematic range. We present predictions for the differential decay rate for both B s → Kμν and B s → Kτν. We also present results for the forward-backward asymmetry, the lepton polarization asymmetry, ratios of the scalar and vector form factors for the decays B s → Klν and B s → D s lν. Our results, together with future experimental measurements, can be used to determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element jV ub j.

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B_s → Kℓv form factors with 2+1 flavors

Cited by 10 publications

References 14 publications

FLAG Review 2019

FLAG Review 2019

Hints and challenges in heavy flavor physics

Bs→Kℓν decay from lattice QCD

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