Charm quark mass dependence in a global QCD analysis

We describe the determination of the strong coupling constant [Formula: see text] and of the charm-quark mass mc(mc) in the [Formula: see text]-scheme, based on the QCD analysis of the unpolarized World deep-inelastic scattering data. At NNLO the values of [Formula: see text] and [Formula: see text] are obtained and are compared with other determinations, and also clarifying discrepancies.

Download Full-text

ZH production in gluon fusion: two-loop amplitudes with full top quark mass dependence

Journal of High Energy Physics ◽

10.1007/jhep03(2021)125 ◽

2021 ◽

Vol 2021 (3) ◽

Author(s):

Long Chen ◽

Gudrun Heinrich ◽

Stephen P. Jones ◽

Matthias Kerner ◽

Jonas Klappert ◽

...

Keyword(s):

Top Quark ◽

Quark Mass ◽

Gluon Fusion ◽

Top Quarks ◽

Mass Dependence ◽

Finite Part ◽

Top Quark Mass ◽

Helicity Amplitudes ◽

Quark Mass Dependence ◽

Loop Amplitudes

Abstract We present results for the two-loop helicity amplitudes entering the NLO QCD corrections to the production of a Higgs boson in association with a Z -boson in gluon fusion. The two-loop integrals, involving massive top quarks, are calculated numerically. Results for the interference of the finite part of the two-loop amplitudes with the Born amplitude are shown as a function of the two kinematic invariants on which the amplitudes depend.

Download Full-text

Quarkonia Formation in a Holographic Gravity–Dilaton Background Describing QCD Thermodynamics

Particles ◽

10.3390/particles4020015 ◽

2021 ◽

Vol 4 (2) ◽

pp. 159-177

Author(s):

Rico Zöllner ◽

Burkhard Kämpfer

Keyword(s):

Quark Mass ◽

Heavy Ion ◽

Mass Dependence ◽

Holographic Model ◽

Spectral Functions ◽

Special Aspect ◽

Quark Masses ◽

Ion Collisions ◽

Heavy Quark Mass ◽

Quark Mass Dependence

A holographic model of probe quarkonia is presented, where the dynamical gravity–dilaton background was adjusted to the thermodynamics of 2 + 1 flavor QCD with physical quark masses. The quarkonia action was modified to account for the systematic study of the heavy-quark mass dependence. We focused on the J/ψ and Υ spectral functions and related our model to heavy quarkonia formation as a special aspect of hadron phenomenology in heavy-ion collisions at LHC.

Download Full-text

Vector meson form factors and their quark-mass dependence

Physical Review C ◽

10.1103/physrevc.77.025203 ◽

2008 ◽

Vol 77 (2) ◽

Cited By ~ 91

Author(s):

M. S. Bhagwat ◽

P. Maris

Keyword(s):

Vector Meson ◽

Quark Mass ◽

Form Factors ◽

Mass Dependence ◽

Quark Mass Dependence

Download Full-text

Exact quark-mass dependence of the Higgs-photon form factor at three loops in QCD

Journal of High Energy Physics ◽

10.1007/jhep04(2021)196 ◽

2021 ◽

Vol 2021 (4) ◽

Author(s):

Marco Niggetiedt

Keyword(s):

Form Factor ◽

Higgs Boson ◽

Quark Mass ◽

Variable Mass ◽

High Energy ◽

Mass Dependence ◽

Leading Order ◽

Energy Limit ◽

Quark Mass Dependence

Abstract We follow up on our discussion of the exact quark-mass dependence of the Higgs-gluon form factor at three loops in QCD [1] and turn our attention to the closely related Higgs-photon form factor. Similarly to our previous work, we intend to examine the form factor for the decay of a Higgs-boson with variable mass into two photons at the three-loop level in QCD. The set of master integrals is known numerically due to prior work on the Higgs-gluon form factor and is exploited to obtain expansions around the threshold as well as in the high-energy limit. Our results may be utilised to derive the photonic decay rate of the Higgs-boson through next-to-next-to-leading order.

Download Full-text