The Bs→μ+μ−γ decay rate at large q2 from lattice QCD
The Bs→μ+μ−γ decay rate at large q2 from lattice QCD
We determine, by means of lattice QCD calculations, the local form factors describing the Bs→μ+μ−γ decay. For this analysis we make use of the gauge configurations produced by the ETM Collaboration with Nf=2+1+1 flavour of Wilson-Clover twisted-mass fermions at maximal twist. To obtain the Bs meson form-factors, we perform simulations for several heavy-strange meson masses mHs in the range mHs∈[mDs,2mDs], and extrapolate to the physical Bs meson point mBs≃5.367 GeV making use of the HQET scaling laws. We cover the region of large di-muon invariant masses q2−−√>4.16GeV, and use our results to determine the branching fraction for Bs→μ+μ−γ, which has been recently measured by LHCb in the region q2−−√>4.9GeV. The largest contribution to the uncertainty in the partial branching fractions at values of q2−−√<4.8GeV is now due to resonance and other long-distance effects, including those from "charming penguins", which we estimate by summing over the contributions from the JP=1− charmonium resonances.
hep-lat
Frezzotti, R.
b5e2ded9-65c2-4c81-ab0b-a1dc3d74f910
Gagliardi, G.
fa872186-87a0-4e5d-bd7a-3d9eb28ce4a9
Lubicz, V.
8161bebb-280a-42e1-bba7-f445c9e2754e
Martinelli, G.
3949da7a-7efe-4ebd-b1f7-92f1ca150d66
Sachrajda, C.T.
0ed6568b-f52f-4314-8677-4aeeb925d6f7
Sanfilippo, F.
14276d98-365a-4c37-a808-f4e9aff31fdc
Simula, S.
8a99d2e2-3a93-463f-ad75-806579d6a668
Tantalo, N.
dad8443c-f768-41f5-947c-ac32db39c040
Frezzotti, R.
b5e2ded9-65c2-4c81-ab0b-a1dc3d74f910
Gagliardi, G.
fa872186-87a0-4e5d-bd7a-3d9eb28ce4a9
Lubicz, V.
8161bebb-280a-42e1-bba7-f445c9e2754e
Martinelli, G.
3949da7a-7efe-4ebd-b1f7-92f1ca150d66
Sachrajda, C.T.
0ed6568b-f52f-4314-8677-4aeeb925d6f7
Sanfilippo, F.
14276d98-365a-4c37-a808-f4e9aff31fdc
Simula, S.
8a99d2e2-3a93-463f-ad75-806579d6a668
Tantalo, N.
dad8443c-f768-41f5-947c-ac32db39c040
[Unknown type: UNSPECIFIED]
Abstract
We determine, by means of lattice QCD calculations, the local form factors describing the Bs→μ+μ−γ decay. For this analysis we make use of the gauge configurations produced by the ETM Collaboration with Nf=2+1+1 flavour of Wilson-Clover twisted-mass fermions at maximal twist. To obtain the Bs meson form-factors, we perform simulations for several heavy-strange meson masses mHs in the range mHs∈[mDs,2mDs], and extrapolate to the physical Bs meson point mBs≃5.367 GeV making use of the HQET scaling laws. We cover the region of large di-muon invariant masses q2−−√>4.16GeV, and use our results to determine the branching fraction for Bs→μ+μ−γ, which has been recently measured by LHCb in the region q2−−√>4.9GeV. The largest contribution to the uncertainty in the partial branching fractions at values of q2−−√<4.8GeV is now due to resonance and other long-distance effects, including those from "charming penguins", which we estimate by summing over the contributions from the JP=1− charmonium resonances.
Text
2402.03262v1
- Author's Original
Available under License Other.
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e-pub ahead of print date: 5 February 2024
Additional Information:
42 page, 25 figures, 6 tables
Keywords:
hep-lat
Identifiers
Local EPrints ID: 487020
URI: http://eprints.soton.ac.uk/id/eprint/487020
PURE UUID: b919b81f-0b48-4f22-83bf-72c1ff65bae5
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Date deposited: 09 Feb 2024 17:44
Last modified: 17 Mar 2024 07:26
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Contributors
Author:
R. Frezzotti
Author:
G. Gagliardi
Author:
V. Lubicz
Author:
G. Martinelli
Author:
F. Sanfilippo
Author:
S. Simula
Author:
N. Tantalo
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