scholarly journals Pole mass renormalon and its ramifications

2021 ◽  
Vol 230 (12-13) ◽  
pp. 2565-2579 ◽  
Author(s):  
Martin Beneke
Keyword(s):  
Heavy Quark ◽  
Quark Mass ◽  
Short Distance ◽  
Charm Quark ◽  
Heavy Quarks ◽  
Pole Mass ◽  
Mass Definition

AbstractI review the structure of the leading infrared renormalon divergence of the relation between the pole mass and the $$\overline{\mathrm{MS}}$$ MS ¯  mass of a heavy quark, with applications to the top, bottom and charm quark. That the pole quark mass definition must be abandoned in precision computations is a well-known consequence of the rapidly diverging series. The definitions and physics motivations of several leading renormalon-free, short-distance mass definitions suitable for processes involving nearly on-shell heavy quarks are discussed.

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 Strange and heavy hadrons production from coalescence plus fragmentation in AA collisions at RHIC and LHC

2018 ◽  
Vol 171 ◽  
pp. 13005
Author(s):  
Salvatore Plumari ◽  
Vincenzo Minissale ◽  
Santosh K. Das ◽  
Francesco Scardina ◽  
Vincenzo Greco
Keyword(s):  
Heavy Quark ◽  
Quark Mass ◽  
Heavy Baryon ◽  
Heavy Quarks ◽  
Heavy Quark Mass ◽  
Heavy Hadron ◽  
Light Baryon ◽  
The One ◽  
Aa Collisions

In a coalescence plus fragmentation approach we study the pT spectra of charmed hadrons D0, Ds up to about 10 GeV and the Λ+c /D0 ratio from RHIC to LHC energies. In this study we have included the contribution from decays of heavy hadron resonances and also that due to fragmentation of heavy quarks that are left in the system after coalescence. The pT dependence of the heavy baryon/meson ratios is found to be sensitive to the heavy quark mass. In particular we found that the Λc/D0 is much flatter than the one for light baryon/meson ratio like p/π and Λ/K.

X(3872) AND ITS PARTNERS IN HEAVY QUARK QCD

2014 ◽  
Vol 26 ◽  
pp. 1460110 ◽  
Author(s):  
C. HIDALGO ◽  
J. NIEVES ◽  
A. OZPINECI ◽  
V. S. ZAMIRALOV
Keyword(s):  
Correlation Function ◽  
Heavy Quark ◽  
Quark Mass ◽  
Degrees Of Freedom ◽  
Charm Quark ◽  
Final States ◽  
Mass Limit ◽  
Isospin Violation ◽  
Charm Quark Mass ◽  
Small X

The properties of X(3872) are analyzed starting from a correlation function written in terms of the quark and gluon degrees of freedom. It is shown that in the infinite charm quark mass limit, X(3872) meson should have three other degenerate meson partners. The possible isospin structure of X(3872) is also analyzed and it is concluded that although the observed isospin violation in the decays of X(3872) into the final states J/ψρ and J/ψω is small, X(3872) can contain a sizable I = 1 component.

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 1-loop matching of a thermal Lorentz force

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
M. Laine
Keyword(s):  
Heavy Quark ◽  
Lorentz Force ◽  
Quark Mass ◽  
Anomalous Dimension ◽  
Vector Current ◽  
Heavy Quarks ◽  
Mass Scale ◽  
The Other ◽  
Magnetic Part ◽  
Heavy Quark Mass

Abstract Studying the diffusion and kinetic equilibration of heavy quarks within a hot QCD medium profits from the knowledge of a coloured Lorentz force that acts on them. Starting from the spatial components of the vector current, and carrying out two matching computations, one for the heavy quark mass scale (M) and another for thermal scales $$ \left(\sqrt{MT},T\right) $$ MT T , we determine 1-loop matching coefficients for the electric and magnetic parts of a Lorentz force. The magnetic part has a non-zero anomalous dimension, which agrees with that extracted from two other considerations, one thermal and the other in vacuum. The matching coefficient could enable a lattice study of a colour-magnetic 2-point correlator.

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.

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