Proceedings of RIKEN BNL Research Center Workshop: Hyperon-Hyperon Interactions and Searches for Exotic Di-Hyperons in Nuclear Collisions

Abstract

RBRC has an active workshop program on strong interaction physics with each workshop focused on a specific physics problem. In most cases all the talks are made available on the RBRC website. In addition, highlights to each speaker's presentation are collected to form proceedings which can therefore be made available within a short time after the workshop. To date there are over one hundred proceeding volumes available.A 10 teraflops RBRC QCDOC computer funded by RIKEN, Japan, was unveiled at a dedication ceremony at BNL on May 26, 2005. This supercomputer was designed and built by individuals from Columbia University, mM, BNL, RBRC, and the University of Edinburgh, with the U.S. D.O.E. Office of Science providing infrastructure support at BNL. Physics results were reported at the RBRC QCDOC Symposium following the dedication. QCDSP, a 0.6 teraflops parallel processor, dedicated to lattice QCD, was begun at the Center on February 19, 1998, was completed on August 28, 1998, and was decommissioned in 2006. It was awarded the Gordon Bell Prize for price performance in 1998. The next generation computer in this sequence, QCDCQ (400 Teraflops), is expected to be fully operational in early 2012. H-dibaryon from INTRODUCTIONThis workshop, held on February 29 through March 2,2012 at Brookhaven National Laboratory, was dedicated to the study of hyperon-hyperon interactions and searches for exotic di-hyperons in nuclear collisions. We brought together the heavy ion and hyperon physics communities to explore new physics opportunities arising from the large number of multiple hyperons produced in heavy ion collisions .. In heavy ion collisions many hyperons (Lambda, Xi, Omega and their anti-particles) are produced in each collision as a result of coalescence or recombination processes from strangeness equilibrated dense partonic matter. This provides a unique opportunity to study hyperon-hyperon interactions through their correlations in heavy ion collisions. The investigation of multi-strangeness hyperonhyperon interactions with high statistics is not feasible in any other laboratory setting. This is a potentially very rich physics area that the heavy ion community has not fully explored yet. For example, the STAR experiment can reconstruct more than several tens of thousands of LambdaLambda pairs, more than a few tens of thousands Xi-Xi pairs and a sizable number of Omega-Omega pairs from TPC data in one year of RHIC running for Au+Au collisions. A large data volume of hyperon samples is also expected from the ALICE experiment at LHC. Such a large amount of hyperon pairs will also provide unprecedented sensitivity on exotic di-hyperon searches.The workshop program covered both recent theoretical progress and experimental results. Exciting talks were presented at the workshop on: a) latest lattice QCD calculations on the hypothetical H particle b) model calculations on nucleon-nucleon, nucleon-hyperon and hyperon-hyperon interactions and the possible existence of stable di-hyperons c) hypemuclear physics and astrophysic...