arXiv subjects

Helene Nadeau

Publications and source records attributed to Helene Nadeau.

2 recordsLinked to original sources

arXiv1996

NRQCD matrix elements in polarization of J-Psi produced from b-decay

We present the non-relativistic QCD (NRQCD) prediction for the polarization of the J-Psi produced in b to J-Psi + X, as well as the helicity-summed production rate. We propose that these observables provide a means of measuring the three most important color-octet NRQCD matrix elements involved in J-Psi production. Anticipating the measurement of the polarization parameter alpha, we determine its expected range given current experimental bounds on the color-octet matrix elements.

hep-ph↗

arXiv1993

Leptoquarks at $eγ$ Colliders

We consider single production of leptoquarks (LQ's) at $eγ$ colliders, for two values of the centre-of-mass energy, $\sqrt{s}=500$ GeV and 1 TeV. LQ's with masses essentially up to the kinematic limit can be seen, even for couplings as weak as $O(10^{-3})$-$O(10^{-2})α_{em}$. It is possible to detect LQ's of mass greater than $\sqrt{s}$ by looking for signals of virtual LQ production in $eγ\to e q{\overline q}$.

hep-ph↗