scholarly journals Mass-suppressed effects in heavy quark diffusion

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
A. Bouttefeux ◽  
M. Laine
Keyword(s):  
Heavy Quark ◽  
Transport Coefficient ◽  
Quark Mass ◽  
Weak Coupling ◽  
Charm Quark ◽  
Leading Order ◽  
Heavy Quark Mass ◽  
Leading Term ◽  
Working Out

Abstract Many lattice studies of heavy quark diffusion originate from a colour-electric correlator, obtained as a leading term after an expansion in the inverse of the heavy-quark mass. In view of the fact that the charm quark is not particularly heavy, we consider subleading terms in the expansion. Working out correlators up to $$ \mathcal{O} $$ O (1/M2), we argue that the leading corrections are suppressed by $$ \mathcal{O} $$ O (T/M), and one of them can be extracted from a colour-magnetic correlator. The corresponding transport coefficient is non-perturbative already at leading order in the weak-coupling expansion, and therefore requires a non­perturbative determination.

scholarly journals INTERPRETATION OF D(2637) FROM HEAVY QUARK SYMMETRY

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 480-482
Author(s):  
PHILIP R. PAGE
Keyword(s):  
Heavy Quark ◽  
Excited States ◽  
Quark Mass ◽  
Charm Quark ◽  
Bound State ◽  
Mass Region ◽  
Delphi Collaboration ◽  
Heavy Quark Mass ◽  
Heavy Quark Symmetry ◽  
D Wave

We demonstrate from heavy quark symmetry that the width of D(2637) claimed by the DELPHI Collaboration is inconsistent with any bound state with one charm quark predicted in the D(2637) mass region, except possibly the D-wave orbitally excited states [Formula: see text] and [Formula: see text] or the radially excited state D′. The former two possibilities are favoured by heavy quark mass relations.

scholarly journals Heavy-flavor hadro-production with heavy-quark masses renormalized in the $$ \overline{\mathrm{MS}} $$, MSR and on-shell schemes

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
M. V. Garzelli ◽  
L. Kemmler ◽  
S. Moch ◽  
O. Zenaiev
Keyword(s):  
Heavy Quark ◽  
Cross Sections ◽  
Top Quark ◽  
Quark Mass ◽  
Production Cross ◽  
Hadron Collider ◽  
Distribution Functions ◽  
Heavy Flavor ◽  
Parton Distribution Functions ◽  
Heavy Quark Mass

Abstract We present predictions for heavy-quark production at the Large Hadron Collider making use of the $$ \overline{\mathrm{MS}} $$ MS ¯ and MSR renormalization schemes for the heavy-quark mass as alternatives to the widely used on-shell renormalization scheme. We compute single and double differential distributions including QCD corrections at next-to-leading order and investigate the renormalization and factorization scale dependence as well as the perturbative convergence in these mass renormalization schemes. The implementation is based on publicly available programs, MCFM and xFitter, extending their capabilities. Our results are applied to extract the top-quark mass using measurements of the total and differential $$ t\overline{t} $$ t t ¯ production cross-sections and to investigate constraints on parton distribution functions, especially on the gluon distribution at low x values, from available LHC data on heavy-flavor hadro-production.

scholarly journals Finite density QCD phase transition in the heavy quark mass region

2012 ◽  
Author(s):  
Hana Saito ◽  
Sinya Aoki ◽  
K. Kanaya ◽  
Hiroshi Ohno ◽  
S. Ejiri ◽  
...  
Keyword(s):  
Phase Transition ◽  
Heavy Quark ◽  
Quark Mass ◽  
Mass Region ◽  
Finite Density ◽  
Qcd Phase Transition ◽  
Heavy Quark Mass

scholarly journals Heavy Quark Mass Effects in PQCD and Heavy Flavor Parton Distributions

2007 ◽  
Author(s):  
Wu-Ki Tung ◽  
Hung-Liang Lai ◽  
Jonathan Pumplin ◽  
Pavel Nadolsky
Keyword(s):  
Heavy Quark ◽  
Quark Mass ◽  
Heavy Flavor ◽  
Parton Distributions ◽  
Mass Effects ◽  
Heavy Quark Mass

HYPERFINE MIXING IN b → c SEMILEPTONIC AND ELECTROMAGNETIC DECAYS OF DOUBLY HEAVY bc BARYONS

2014 ◽  
Vol 26 ◽  
pp. 1460107
Author(s):  
C. ALBERTUS ◽  
E. HERNÁNDEZ ◽  
J. NIEVES
Keyword(s):  
Heavy Quark ◽  
Quark Mass ◽  
Semileptonic Decay ◽  
Spin Symmetry ◽  
Mass Limit ◽  
Electromagnetic Decays ◽  
Heavy Quark Mass ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Symmetry Relations

We show that semileptonic and electromagnetic decays involving spin-1/2 doubly heavy bc baryons are very sensitive to hyperfine mixing in their wave functions. We further show how heavy quark spin symmetry relations, obtained in the infinite heavy quark mass limit and near zero recoil, could be used to extract the admixtures in a model independent way from semileptonic decay data. On the other hand the infinite heavy quark mass limit gives wrong predictions in the electromagnetic case.

scholarly journals A Gluon Condensate Term in a Heavy Quark Mass

2003 ◽  
Vol 18 (25) ◽  
pp. 1735-1741
Author(s):  
V. V. Kiselev
Keyword(s):  
Heavy Quark ◽  
Quark Mass ◽  
Mass Shell ◽  
Gluon Condensate ◽  
Heavy Quark Mass ◽  
Dispersion Law

We investigate a connection between a renormalon ambiguity of heavy quark mass and the gluon condensate contribution into the quark dispersion law related to a virtuality defining a displacement of the heavy quark from the perturbative mass-shell, which happens inside a hadron.

scholarly journals Heavy quark mass effects in e+e− into three jets

1999 ◽  
Vol 74 (1-3) ◽  
pp. 53-56 ◽  
Author(s):  
Mikhail Bilenky ◽  
Germán Rodrigo ◽  
Arcadi Santamaria
Keyword(s):  
Heavy Quark ◽  
Quark Mass ◽  
Mass Effects ◽  
Heavy Quark Mass
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