Results 11 to 20 of about 1,124 (167)
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
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Bottom-quark fragmentation in top-quark decay [PDF]
Nuclear Physics B, 2002 We study the fragmentation of the b quark in top decay in NLO QCD, within the framework of perturbative fragmentation, which allows one to resum large logarithms $\sim\log (m_t^2/m_b^2)$. We show the b-energy distribution, which we compare with the exact ${\cal O} (α_S)$ result for a massive b quark.
Corcella, Gennaro, Mitov, Alexander D.
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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
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Heavy quark effective theory computation of the mass of the bottom quark [PDF]
Journal of High Energy Physics, 2007 We present a fully non-perturbative computation of the mass of the b-quark in the quenched approximation. Our strategy starts from the matching of HQET to QCD in a finite volume and finally relates the quark mass to the spin averaged mass of the Bs meson in HQET. All steps include the terms of order Lambda^2/Mb.
Michele Della Morte +3 more
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Charm and bottom quark masses: An update [PDF]
Physical Review D, 2009 Using new four-loop results for the heavy quark vacuum polarization and new data for bottom quark production in electron-positron annihilation, an update on the determination of charm- and bottom-quark masses through sum rules has been performed. The previous result for the charm-quark mass, $m_c(3 {\rm GeV})= 0.986(13) {\rm GeV}$, based on the lowest ...
Chetyrkin, K. G. +6 more
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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
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A phenomenological study of bottom-quark fragmentation in top-quark decay [PDF]
The European Physical Journal C, 2009 Top-quark physics is one of the main fields of investigation at the Tevatron accelerator and, ultimately, at the LHC. We perform a phenomenological analysis of ttbar events at hadron colliders, with a focus on observables relying on bottom-quark fragmentation in top-quark decay.
Corcella, Gennaro, Mescia, Federico
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An inequality on the mass of the bottom quark [PDF]
Physics Letters B, 1978 Abstract We establish inequalities on the energy levels of two-particle systems interacting via the same potential with different masses and different angular momenta. When this is applied to the J ψ and ϒ particles, one gets an inequality on the mass difference between the heavy quark and the charmed quark as a function of the masses of the
H. Grosse, A. Martin
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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
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Resolving charged hadrons in QED — gauge invariant interpolating operators
Journal of High Energy Physics, 2022 Standard interpolating operators for charged mesons, e.g. J B = b ¯ $$ \overline{b} $$ iγ 5 u for B − , are not gauge invariant in QED and therefore problematic for perturbative methods.
Saad Nabeebaccus, Roman Zwicky
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