scholarly journals Cancellation of infrared divergence in inclusive production of heavy quarkonia

2016 ◽  
Vol 93 (10) ◽  
Author(s):  
Gao-Liang Zhou
Keyword(s):  
Infrared Divergence ◽  
Heavy Quarkonia ◽  
Inclusive Production

scholarly journals Inclusive production of heavy quarkonia in pNRQCD

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Nora Brambilla ◽  
Hee Sok Chung ◽  
Antonio Vairo
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Distance Matrix ◽  
Effective Field ◽  
Heavy Quarkonia ◽  
Inclusive Production ◽  
Theory Approach ◽  
Matrix Elements ◽  
Long Distance ◽  
Nonrelativistic Qcd

Abstract We develop a formalism for computing inclusive production cross sections of heavy quarkonia based on the nonrelativistic QCD and the potential nonrelativistic QCD effective field theories. Our formalism applies to strongly coupled quarkonia, which include excited charmonium and bottomonium states. Analogously to heavy quarkonium decay processes, we express nonrelativistic QCD long-distance matrix elements in terms of quarkonium wavefunctions at the origin and universal gluonic correlators. Our expressions for the long-distance matrix elements are valid up to corrections of order $$ 1/{N}_c^2 $$ 1 / N c 2 . These expressions enhance the predictive power of the nonrelativistic effective field theory approach to inclusive production processes by reducing the number of nonperturbative unknowns, and make possible first-principle determinations of long-distance matrix elements once the gluonic correlators are known. Based on this formalism, we compute the production cross sections of P-wave charmonia and bottomonia at the LHC, and find good agreement with measurements.

scholarly journals Inclusive Hadroproduction of P-wave Heavy Quarkonia in pNRQCD

2022 ◽  
Vol 258 ◽  
pp. 04005
Author(s):  
Hee Sok Chung
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Distance Matrix ◽  
Heavy Quarkonia ◽  
P Wave ◽  
Inclusive Production ◽  
Matrix Elements ◽  
Long Distance ◽  
Strongly Coupled ◽  
Section Data

We compute NRQCD long-distance matrix elements that appear in the inclusive production cross sections of P-wave heavy quarkonia in the framework of potential NRQCD. The formalism developed in this work applies to strongly coupled charmonia and bottomonia. This makes possible the determination of color-octet NRQCD long-distance matrix elements without relying on measured cross section data, which has not been possible so far. We obtain results for inclusive production cross sections of χcJ and χbJ at the LHC, which are in good agreement with measurements.

scholarly journals Exclusive heavy vector meson electroproduction to NLO in collinear factorisation

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
C. A. Flett ◽  
J. A. Gracey ◽  
S. P. Jones ◽  
T. Teubner
Keyword(s):  
Phase Space ◽  
Vector Meson ◽  
Heavy Quarkonia ◽  
Diffractive Scattering ◽  
Meson Electroproduction

Abstract We compute the exclusive electroproduction, γ*p → Vp, of heavy quarkonia V to NLO in the collinear factorisation scheme, which has been formally proven for this process. The inclusion of an off-shell virtuality Q2 carried by the photon extends the photoproduction phase space of the exclusive heavy quarkonia observable to electroproduction kinematics. This process is relevant for diffractive scattering at HERA and the upcoming EIC, as well as at the proposed LHeC and FCC.

scholarly journals Energy loss of heavy quarkonia in hot QCD plasmas

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Juhee Hong ◽  
Su Houng Lee
Keyword(s):  
Energy Loss ◽  
Heavy Quarkonia

scholarly journals The thermal width of heavy quarkonia moving in quark–gluon plasma

2008 ◽  
Vol 659 (3) ◽  
pp. 621-627 ◽  
Author(s):  
Taesoo Song ◽  
Yongjae Park ◽  
Su Houng Lee ◽  
Cheuk-Yin Wong
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Heavy Quarkonia

scholarly journals INFRARED DIVERGENCE IN QED3 AT FINITE TEMPERATURE

1999 ◽  
Vol 14 (18) ◽  
pp. 2921-2947 ◽  
Author(s):  
DOMINIC LEE ◽  
GEORGIOS METIKAS
Keyword(s):  
Finite Temperature ◽  
Statistical Physics ◽  
Order Term ◽  
Dyson Equation ◽  
Infrared Divergence ◽  
Fermion Mass ◽  
Photon Propagator ◽  
Transverse Part ◽  
Transverse Photon ◽  
Range Of Values

We consider various ways of treating the infrared divergence which appears in the dynamically generated fermion mass, when the transverse part of the photon propagator in N flavour QED 3 at finite temperature is included in the Matsubara formalism. This divergence is likely to be an artifact of taking into account only the leading order term in the [Formula: see text] expansion when we calculate the photon propagator and is handled here phenomenologically by means of an infrared cutoff. Inserting both the longitudinal and the transverse part of the photon propagator in the Schwinger–Dyson equation, we find the dependence of the dynamically generated fermion mass on the temperature and the cutoff parameters. It turns out that consistency with certain statistical physics arguments imposes conditions on the cutoff parameters. For parameters in the allowed range of values we find that the ratio r=2* Mass (T=0)/critical temperature is approximately 6, consistent with previous calculations which neglected the transverse photon contribution.

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