Dr Gregory SOYEZ (IPhT/CEA Saclay)
Mr Frédéric Dreyer (LPTHE)
As hadron collider physics continues to push the boundaries of precision, it becomes increasingly important to have methods for predicting properties of jets across a broad range of jet radius values R, and in particular for small R. In this presentation we will start with a brief review of jet physics at hadron colliders, and introduce a method to resum all leading logarithmic terms,...
Mr Renaud Boussarie (LPT Orsay)
We present the calculation of the impact factor for the photon to quark, antiquark and gluon transition within Balitsky's high energy OPE. We also rederive the impact factor for photon to quark and antiquark transition within the same framework. These results provide the necessary building blocks for further phenomenological studies of inclusive diffractive DIS as well as for two and three...
Ou Zhang (University of Arizona and IPN-Orsay)
Soft radiation consists of coherent low energy gluons that interact with initial and final state jets at wide angles from the jet axis, and we show that this soft radiation in ee, ep and pp collisions is universal to order $\alpha_s^2$ in perturbation theory. We factor this soft radiation out of the multi-scale cross-section using Soft Collinear Effective Theory, which is an effective field...
45. J/psi-Pair Production at Large Momenta: Indications for Double-Parton Scatterings and Large alpha_s^5 Contributions
Dr Hua-Sheng Shao (CERN)
The recent observations of prompt $J/\psi$-pair production by CMS at the LHC and by D0 at the Tevatron reveal the presence of different production mechanisms in different kinematical regions. We find out that next-to-leading-order single-parton-scattering contributions at $\alpha_s^5$ dominate the yield at large transverse momenta of the pair. Our analysis further emphasises the importance of...
24. Quarkonia suppression in a quark-gluon plasma produced in heavy ion collisions at high energies.
Mr Roland Katz (Subatech)
The theory of elementary particles predicts the existence of a new state of matter: the Quark-Gluon Plasma (QGP). The latter may have existed at the first moments of the Universe following the Big Bang and can be, in theory, re-produced in heavy ion collisions at high energy colliders (e.g. the LHC). One of the QGP possible observables is the suppression of the quarkonia (heavy...