Conveners
QCD & EW I
- Daniel Wiegand (University of Pittsburgh)
We study the interference between the amplitudes for $gg \rightarrow X \rightarrow gg$, where $X$ is a new heavy digluon resonance, and the QCD background $gg \rightarrow gg$, at the Large Hadron Collider. The interference produces a large low-mass tail and a deficit of events above the resonance mass, compared to the naive pure resonance peak. For a variety of different resonance quantum...
Future electron-position colliders, such as CEPC and FCC-ee, have the capability
to dramatically improve the experimental precision for W and Z-boson masses and
couplings. This would enable indirect probes of physics beyond the Standard Model at
multi-TeV scales. For this purpose, one must complement the experimental measurements with equally precise calculations for the theoretical...
We present the calculation of the master integrals needed for the two loop mixed QCD-Electroweak virtual corrections to the neutral current Drell-Yan processes $(q\bar{q}\rightarrow l^+ l^-)$. The dependence on the lepton mass is expanded such that potentially large logarithmic contributions are kept. Finally, the canonical master integrals are given as a Taylor series around four space-time...
For almost 10 years now we are facing the proton radius puzzle, the difference between the proton charge radius extraction using electrons and muons. Taken at face value, the puzzle might be an indication of a new force in nature coupling to muons, but not to electrons. Recently PRad, a new electron-proton scattering experiment at Jefferson Lab, reported a proton charge radius that agrees with...
The electron electric dipole moment (EDM) is a very good probe of new physics beyond the standard model, and it is currently measured in many experiments.
It also receives contribution from the standard model, but this was estimated to be very small in previous works.
In this talk, we show that the short distance (quark-level) contribution to the electron EDM is suppressed by factors of...
The use of Integration-By-Parts (IBP) identities is currently an unavoidable step for the computation of scat-
tering amplitudes. IBP identities have been traditionally constructed in momentum space and, more recently, by employing Baikov parametrization. In this talk, we show the construction of a system of IBP-like equations over parametric space, namely using Schwinger-Feynman parameters...
