Results 21 to 30 of about 1,004,536 (238)
Soft logarithms in processes with heavy quarks
Journal of High Energy Physics, 2022 Observables involving heavy quarks can be computed in perturbative QCD in two different approximation schemes: either the quark mass dependence is fully retained, or it is retained only where needed to regulate the collinear singularity.
Daniele Gaggero +3 more
doaj +1 more source
Top-Quark Mass and Bottom-Quark Decay [PDF]
Physical Review Letters, 1983 The possibility of a long B-meson lifetime is explored, in which case the weak mixing angles θ_2 and θ_3 are quite small. This allows the derivation of a lower bound on the top-quark mass as a function of the B-meson lifetime, by comparison of the short-distance prediction for the CP-nonconservation parameter e with its experimental value. The bound is
Paul H. Ginsparg +2 more
openaire +1 more source
Bottom quark mass with calibrated uncertainty
The European Physical Journal C, 2022 AbstractWe determine the bottom quark mass $${\hat{m}}_b$$ m ^ b from QCD sum rules of moments of the vector current correlator calculated in perturbative QCD to $${{\mathcal {O}}} ({\hat ...
Erler, Jens +2 more
openaire +3 more sources
Investigating bottom-quark Yukawa interaction at Higgs factory * [PDF]
Chinese Physics C, 2021 Abstract Measuring the fermion Yukawa coupling constants is important for understanding the origin of the fermion masses and their relationship with spontaneously electroweak symmetry breaking. In contrast, some new physics (NP) models change the Lorentz structure of the Yukawa interactions between standard model (SM) fermions and the SM-
Bi,Qi +4 more
openaire +2 more sources
Light-cone sum rules for S-wave B → Kπ form factors
Journal of High Energy Physics, 2023 We derive a set of light-cone sum rules relating the S-wave B → Kπ hadronic form factors to the B-meson light-cone distribution amplitudes (LCDAs), taking into account the complete set of LCDAs up to and including twist four. These results complement the
Sébastien Descotes-Genon +3 more
doaj +1 more source
Single bottom quark production in k ⊥-factorisation [PDF]
Journal of High Energy Physics, 2015 We present a study within the kT-factorisation scheme on single bottom quark production at the LHC. In particular, we calculate the rapidity and transverse momentum differential distributions for single bottom quark/anti-quark production. In our setup, the unintegrated gluon density is obtained from the NLx BFKL Green function whereas we included mass ...
Chachamis, Grigorios +4 more
openaire +4 more sources
Dispersive analysis of Λ b → Λ(1520) local form factors
Journal of High Energy Physics, 2023 We perform an analysis of Λ b → Λ(1520) local form factors. We use dispersive techniques to provide a model-independent parametrisation of the form factors that can be used in the whole kinematic region.
Yasmine Amhis +2 more
doaj +1 more source
Insights on the current semi-leptonic B-decay discrepancies — and how B s → μ + μ − γ can help
Journal of High Energy Physics, 2023 B s → μ + μ − γ, measured at high q 2 as a partially reconstructed decay, can probe the origin of the existing discrepancies in semi-leptonic b → s and b → c decays. We perform a complete study of this possibility.
Diego Guadagnoli +3 more
doaj +1 more source
From D s → γ in lattice QCD to B s → μμγ at high q 2
Journal of High Energy Physics, 2023 We use a recent lattice determination of the vector and axial D s → γ form factors at high squared momentum transfer q 2 to infer their B s → γ counterparts. To this end, we introduce a phenomenological approach summarized as follows.
Diego Guadagnoli +3 more
doaj +1 more source
The electro-weak couplings of the top and bottom quarks — Global fit and future prospects [PDF]
Journal of High Energy Physics, 2019 We evaluate the implications of LHC and LEP/SLC measurements for the electro-weak couplings of the top and bottom quarks. We derive global bounds on the Wilson coefficients of ten two-fermion operators in an effective field theory description.
G. Durieux +6 more
semanticscholar +1 more source