Realistic Simulation of BM@N GEM Detectors: Model Implementation and Testing

The Lorentz shift of electrons in a magnetic field is taken into account with simulating the response of a GEM detector for the BM@N experiment. Dependences of the determined coordinate x on the track angle, the values of the Lorentz shift of electrons and its dispersion for the gas mixture ArC4H10 were obtained. The momentum resolution was obtained as a function of the momentum for the deuteron-carbon (dC) process, and the invariant mass of the Λ-hyperon was determined. The obtained results are close to the first results of experimental data collected in the technical run in interactions of the deuteron beam of 4 AGeV with different targets

The BM@N Experiment at JINR: Status and Physics Program

BM@N (Baryonic Matter at Nuclotron) is the first experiment to be realized at the accelerator complex of NICA-Nuclotron at JINR (Dubna, Russia). The aim of the experiment is to study interactions of relativistic heavy ion beams with energy up to of strange mesons, multi-strange hyperons and light hyper-nuclei which are produced in nucleus-nucleus collisions close to the kinematic threshold. The BM@N set-up, the experimental program and first results of technical runs are presented

Photon 2003: a theorist's summary and outlook

In this talk I present a summary of some of the discussions at the conference on various topics in Photon physics, selected with a view to give a theorist's perspective, of the current status and future prospects, of the developments in the field. After discussing some of the recent theoretical developments in the subject of Photon Structure function, I will focus on what the photon has helped us learn about the spin structure of a proton, aspects of perturbative and nonperturbative QCD as well as forward and diffractive physics. I will discuss the challenges that the data on heavy flavour production in the two photon reactions and in photo production, seem to have presented to the theorists. Then I discuss the direction in which photon physics is likely to go in future and what we {\em need} the photons to still tell us. I will end by talking about the newer developments in prospects for photon studies at future colliders and opportunities that these will provide us to learn about the physics beyond the Standard Model.Comment: 17 pages, LaTeX, uses espcrc2.sty, 12 figures, Summary talk presented by R.M. Godbole at PHOTON-2003, International Meeting on Structure and Interactions of the Photon, Frascati, Italy, April 7-11, 200

Triple GEM Tracking Detectors for the BM@N Experiment

BM@N (Baryonic Matter at the Nuclotron) is the fixed target experiment aimed to study nuclear matter in the relativistic heavy ion collisions at the Nuclotron accelerator in JINR. The BM@N tracking system is based on Gas Electron Multipliers (GEM) detectors, mounted inside the BM@N analyzing magnet. The structure of the GEM detectors and the results of study of their characteristics are presented. The GEM detectors are integrated into the BM@N experimental setup and data acquisition system. The results of the first test of the GEM tracking system in the technical run with the deuteron beam are shortly reviewed

On Regge kinematics in SCET

We discuss the kinematics of the particles that make up a Reggeon in field theory, using the terminology of the Soft Collinear Effective Theory (SCET). Reggeization sums a series of strongly-ordered collinear emissions resulting in an overall Reggeon exchange that falls in the Glauber or Coulomb kinematic region. This is an extremely multi-scale problem and appears to fall outside of the usual organizing scheme of SCET.Comment: 7 pages, 3 figure

Production of {\pi}+ and K+ mesons in argon-nucleus interactions at 3.2 AGeV

First physics results of the BM@N experiment at the Nuclotron/NICA complex are presented on {\pi}+ and K+ meson production in interactions of an argon beam with fixed targets of C, Al, Cu, Sn and Pb at 3.2 AGeV. Transverse momentum distributions, rapidity spectra and multiplicities of {\pi}+ and K+ mesons are measured. The results are compared with predictions of theoretical models and with other measurements at lower energies.Comment: 29 pages, 20 figure