Quark-mass dependence of the baryon ground-state masses

The mass spectrum of spin-1/2 baryons in both parity channels is computed using the methods of lattice QCD in the quenched approximation. An anisotropic action with anisotropy as/at = 3 is employed, using tree-level coefficients with tadpole improvement. Clear splittings from the nucleon ground state are observed with smeared operators and 500 configurations. Methods for extracting the first excited states are investigated. Using the quark mass dependence of the masses, qualitative comparisons are made with previous calculations and experiment.

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