A new critical study of photon production in hadronic collisions

In the light of the new prompt photon data collected by PHENIX at RHIC and by D0 at the run II of the Tevatron, we revisit the world prompt photon data, both inclusive and isolated, in hadronic collisions, and compare them with the NLO QCD calculations implemented in the Monte Carlo programme JETPHOX.Comment: 19 pages; 12 figure

Mesure d'effet de spin dans la réaction inclusive pp↑→π0Xpp \uparrow \to \pi^{0} X a 24 GeV/C dans la région centrale et à grande impulsion transversale

This. thesis presents the measurement of the spin dependent production of n° mesons at Pt > 1 GeV/c produced in the central region in pp collisions. One uses an intense proton beam of 24 GeV/c incident on a polarized proton target. The n° energy is measured with lead-glass counters. The "up"-"down" asymmetry is negative and grows with Pt up to more than -50% for Pt greater than 2. GeV/c. This effect suggests a constituant picture of the interaction. Such an effect would, if confirmed at higher energy, modify the current hard scatterring models. A theoretical investigation of soft processes explaining such an effect would certainly improve our present knowledge of confinement

Denis Perret-Gallix (1949-2018)

International audienceDenis Perret-Gallix was the founder of the AIHENP-ACAT workshop series in 1990 and has chaired its international advisory committee until June 2018. He passed away on June 28 during one of the mountain bike climbs he used to enjoy. He was a high energy experimental physicist affiliated to IN2P3-CNRS (research director). He worked at Rutherford Lab., SLAC (DELCO experiment), CERN (CHARM and L3 experiments) and KEK developing low temperature dark matter detectors and event generators for the collider (LEP, LHC, ILC) physics simulations. He was the director of the CNRS Tokyo office from 2000 to 2004 and played a leading role in the France-Japan Particle Physics Laboratory which was established in 2006