Measurement of the Central Exclusive Production of pion pairs using tagged forward protons at the STAR detector at RHIC

We present preliminary measurement of the invariant mass spectrum of the two oppositely charged pions produced in the process pp → pπ+π−p (Central Exclusive Production), obtained with the STAR detector at RHIC at √(s) = 200 GeV. The Roman Pots were used to tag forward protons and the invariant mass of the pion pair was obtained using tracks reconstructed in the STAR Time Projection Chamber (TPC). The non-exclusive background estimated from events with like-sign track pairs is small, thus proof of principle of this type of the measurement at small momentum transfer to proton is established. Plans for the future are also discussed

Small xx phenomenology: Summary and status

A second workshop on small x physics, within the Small x Collaboration, was held in Lund in June 2002 with the aim of over-viewing recent theoretical progress in this area and summarizing the experimental status. This paper is dedicated to the memory of Jan Kwiecinski, who died unexpectedly on August 29, 2003

Small x Phenomenology - summary of the 3rd Lund Small x Workshop in 2004

A third workshop on small-x physics, within the Small-x Collaboration, was held in Hamburg in May 2004 with the aim of overviewing recent theoretical progress in this area and summarizing the experimental status