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Annual Users Meeting

June 1-5, 2009
Brookhaven National Laboratory


Third Meeting of the APS Topical Group on Hadronic Physics

Ramona VogtBy Ramona Vogt (LLNL and UC Davis)

The units of the American Physical Society (its divisions, topical groups, forums, and sections) help fulfill the APS mission to “advance and diffuse the knowledge of physics”.  The units provide opportunities for members to interact with colleagues with similar interests and to keep abreast of new developments in their specialized fields.  Communication within units is promoted through unit meetings and newsletters.  The units also organize symposia at APS meetings to encourage informal networking.  APS units also nominate their members for APS fellowships; the larger the unit, the more fellowship nominations it is allowed each year.

GHP09 participants

Group photo showing most of the GHP09 participants.

Most members of the RHIC community are familiar with the Division of Nuclear Physics (DNP) and many belong to this unit.  However, there is another APS unit that should be of interest to RHIC physicists: the Topical Group on Hadronic Physics (or GHP).  "Topical groups" are smaller and more focused APS units than divisions. In this case, the mission of the GHP is the advancement and diffusion of knowledge related to QCD and hadronic physics.   The hadronic physics community is quite diverse and includes physicists working on spectroscopy, lattice gauge theory, nucleon structure physics (structure functions and spin), jet physics, heavy-ion physics, and QCD at finite temperature and density.  Thus, many GHP members already belong to either or both DNP or DPF (the Division of Particle and Fields).   However, physicists interested in the interactions and structure of strongly-interacting particles, both in vacuum and at high temperature and density (i.e. all RHIC-related physicsts) should really consider joining and make their presence felt.

The GHP web page can be found at http://aps.org/units/ghp/, and allows for signing up for GHP membership online.

The GHP executive committee currently consists of Winston Roberts (Florida State), chair; Stanley Brodsky (Stanford), chair elect; Ronald Gilman (Rutgers), vice chair; Curtis Meyer (Carnegie Mellon), past chair; Wally Melnitchouk (JLab), secretary/treasurer; and two members-at-large, Ramona Vogt (LLNL and UC Davis) and Sebastian Kuhn (Old Dominion).  Members elected vice chair serve on the executive committee for four years.  The tenure for members-at-large is two years.

Winston Roberts and Jian-ping Chen

Winston Roberts, current chair of the GHP, presents the APS Fellowship certificate to Jian-ping Chen of JLab.

The third GHP workshop, GHP09, took place from April 29-May 1 in Denver, CO, just before the April APS meeting and consisted of plenary and parallel sessions.  At the reception on April 29, Jian-Ping Chen was awarded his APS fellowship certificate by Winston Roberts, GHP chair and chair of the GHP09 organizing committee.  The other members of the organizing committee were Stanley Brodsky (SLAC), Carl Carlson (William and Mary), Susan Schadmand (Juelich), Reinhard Schumacher (Carnegie Mellon) and Ramona Vogt (LLNL and UC Davis).  The program, with links to the abstracts and talks, can be found on the workshop web page, ably maintained by Susan Schadmand.

A number of plenary talks were devoted to RHIC-related topics including talks by Anne Sickles (baryon production), Paul Sorenson (scaling of multiplicity moments), Ludmila Levkova (finite-temperature QCD), Agnes Mocsy (quarkonia in hot, dense media), Astrid Morreale (spin physics) and Ramona Vogt (quarkonia production mechanisms).  There were two parallel sessions on heavy-ion collisions with speakers from STAR and PHENIX.  STAR's Haidong Liu spoke on quarkonium measurements.  PHENIX had three talks: Mikhail Stepanov on using azimuthal angle correlations of forward rapidity muons to study charm, Xiaorong Wang on heavy flavor measurements, and Hugo Pereira da Costa on quarkonium.   The LHC heavy-ion program was represented by Rene Bellwied (ALICE), Alexandre Lebedev (ATLAS), and Camelia Mironov (CMS).  Alberto Accardi spoke about in-medium hadronization.  In addition, Ralf Seidl (PHENIX) and Robert Fersch (STAR) spoke about RHIC spin results.

Several sessions were devoted to heavy flavor physics, an important topic in the entire hadronic physics community.  Recent heavy flavor results were presented by SELEX, BaBar, Belle, and CLEO-c, while future heavy flavor programs at PANDA and LHCb were also described.  JLab results on structure functions and parton densities were presented in several sessions.  Such measurements, taken together with the RHIC spin program, help provide a complete picture of the internal structure of both the free nucleon and nucleons in nuclei.  Results on light meson spectroscopy and exotic meson searches were also presented.  Finally, the view of hadronic physics in the NSAC Long Range Plan and at the NSF was provided, respectively, by Zein-Eddine Meziani and Brad Keister.

GHP09 was the largest GHP workshop so far, with more than 90 participants and 80 talks.  We hope to continue to grow the GHP by continuing to attract interested physicists to the group.  Please have a look at the GHP website and consider joining!

GHP09 workshop poster