scholarly journals Charm quark transport within viscous QCD medium : colliding and radiating

2021 ◽  
Author(s):  
Adiba Shaikh ◽  
Manu Kurian ◽  
Santosh Kumar Das ◽  
Vinod Chandra ◽  
Sadhana Dash ◽  
...  
Keyword(s):  
Charm Quark

scholarly journals Electric dipole moment constraints on CP-violating heavy-quark Yukawas at next-to-leading order

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Joachim Brod ◽  
Emmanuel Stamou
Keyword(s):  
Electric Dipole ◽  
Anomalous Dimension ◽  
Phenomenological Study ◽  
Dipole Moments ◽  
Charm Quark ◽  
Leading Order ◽  
Logarithmic Order ◽  
Electric Dipole Moments ◽  
Yukawa Couplings ◽  
Experimental Bound

Abstract Electric dipole moments are sensitive probes of new phases in the Higgs Yukawa couplings. We calculate the complete two-loop QCD anomalous dimension matrix for the mixing of CP-odd scalar and tensor operators and apply our results for a phenomenological study of CP violation in the bottom and charm Yukawa couplings. We find large shifts of the induced Wilson coefficients at next-to-leading-logarithmic order. Using the experimental bound on the electric dipole moments of the neutron and mercury, we update the constraints on CP-violating phases in the bottom and charm quark Yukawas.

scholarly journals CHARMONIUM PRODUCTION AT THE LHC

1996 ◽  
Vol 11 (19) ◽  
pp. 1555-1562 ◽  
Author(s):  
K. SRIDHAR
Keyword(s):  
Cross Section ◽  
Event Rate ◽  
Charm Quark ◽  
Large Transverse Momentum ◽  
Fragmentation Mechanism ◽  
Charmonium Production ◽  
Quark Fragmentation ◽  
Gluon Production ◽  
Gluon Fragmentation ◽  
Important Test

The analyses of large transverse momentum charmonium production at the Tevatron have shown that fragmentation of gluons is an important production mechanism. We study large-pT charmonium production in pp collisions at the LHC, and find that due to the copious gluon production at this energy, the gluon fragmentation contribution completely overwhelms the fusion contribution and the charm quark fragmentation contribution. Our analysis shows that for J/ψ production at the LHC, there is a significant event rate even for pT ~ 100 GeV. The measurement of the cross-section at such large values of pT will provide a very important test of the fragmentation mechanism.

A NUMERICAL STUDY OF IMPROVED WILSON QUARK ACTIONS ON ANISOTROPIC LATTICES

2007 ◽  
Vol 22 (07n10) ◽  
pp. 515-528
Author(s):  
LIUMING LIU ◽  
SHIQUAN SU ◽  
XIN LI ◽  
CHUAN LIU
Keyword(s):  
Quark Mass ◽  
Numerical Study ◽  
Charm Quark ◽  
Gauge Coupling ◽  
Speed Of Light ◽  
Lattice Action ◽  
Charm Quark Mass ◽  
Anisotropic Lattices ◽  
Optimal Value ◽  
Pseudo Scalar

Tadpole improved Wilson quark actions with clover terms on anisotropic lattices are studied numerically. Using asymmetric lattice volumes, the pseudo-scalar meson dispersion relations are measured for 8 lowest lattice momentum modes with quark mass values ranging from the strange to the charm quark with various values of the gauge coupling β and 3 different values of the bare speed of light parameter ν. These results can be utilized to extrapolate or interpolate to obtain the optimal value for the bare speed of light parameter νopt(m) at a given gauge coupling for all bare quark mass values m. In particular, the optimal values of ν at the physical strange and charm quark mass are given for various gauge couplings. The lattice action with these optimized parameters can then be used to study physical properties of hadrons involving either light or heavy quarks.

scholarly journals Simulating twisted mass fermions at physical light, strange, and charm quark masses

2018 ◽  
Vol 98 (5) ◽  
Author(s):  
Constantia Alexandrou ◽  
Simone Bacchio ◽  
Panagiotis Charalambous ◽  
Petros Dimopoulos ◽  
Jacob Finkenrath ◽  
...  
Keyword(s):  
Charm Quark ◽  
Quark Masses ◽  
Twisted Mass
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