# Seminars

1. MAY

26

Today

Nuclear Physics Seminar

"Probing Nucleon Structure Through Transversely Polarized Proton-proton Collisions at STAR"

Presented by Jim L. Drachenberg, Valparaiso University

11 am, Small Seminar Room, Bldg. 510

Tuesday, May 26, 2015, 11:00 am

Hosted by: Oleg Eyser

At leading twist, a complete picture of the one-dimensional momentum structure of the nucleon requires knowledge of three types of parton distribution functions (PDFs): the unpolarized PDFs; the helicity PDFs; and the transversity PDF, related to the transverse polarization of quarks within a transversely polarized nucleon. Current global extractions of transversity are limited by the kinematic reach of existing semi-inclusive deep-inelastic scattering (SIDIS) experiments. Beyond the open questions of one-dimensional nucleon structure, myriad opportunities abound in exploring the multi-dimensional structure of the nucleon. A step toward this goal is to investigate the nature of the transverse momentum dependence (TMD) of nucleon parton densities and their relation to nucleon spin polarization. The STAR experiment at RHIC proposes to investigate these and other spin-related phenomena through the interaction of high-energy collisions between spin-polarized protons. In preliminary results from data collected in 2011 at $\sqrt{s}=500$ GeV and in 2012 at $\sqrt{s}=200$ GeV, STAR has observed the first non-zero spin asymmetries due to the effects of transversity in proton-proton collisions. Studying these effects through both jet+hadron and di-hadron production channels and across a range of collision energy yields the potential not only to extend understanding of transversity beyond the current kinematic reach but also to address longstanding theoretical questions concerning the universality and evolution of transversity and polarized fragmentation functions. From the 2011 dataset STAR has also released the first preliminary measurements sensitive to the Sivers TMD PDF in weak-boson production. Weak boson production provides an ideal tool for isolating the unconstrained sea-quark Sivers PDF and may provide sensitivity to the expected modified universality of the Sivers PDF when compared to SIDIS. These exploratory measurements pave the way for future higher precision inv

2. JUN

2

Tuesday

Nuclear Physics Seminar

"Elliptic flow from anisotropic escape"

Presented by Denes Molnar, Purdue University

11 am, Small Seminar Room, Bldg. 510

Tuesday, June 2, 2015, 11:00 am

Hosted by: Jin Huang

While hydrodynamics is regarded as the dominant paradigm for describing heavy-ion collisions at RHIC and LHC energies, its applicability to nuclear reactions is not very well understood. Open question remain about the mechanism of rapid thermalization, initial conditions, treatment of decoupling (conversion of the fluid to particles), finite system effects, and quantum corrections in very small systems, for example. In a recent work (arXiv:1502.05572) we showed that in the AMPT transport model elliptic flow is generated quite differently from hydrodynamics, mainly through anisotropic escape from the collision zone. I will demonstrate that this is, in fact, a general feature of kinetic theory, originating in the modest opacities <Ncoll> \sim 4-5 in AMPT calculations. Implications of the escape effect will be discussed together with connections to other hydro related problems such as proper particle distributions (arXiv:1404.8750) and anisotropic flow from quantum mechanics (arXiv:1404.4119).

3. JUN

4

Thursday

RIKEN Lunch Seminar

"Non-relativistic particles in a thermal bath"

Presented by Antonio Vairo, Munich Technical University

12:30 pm, Building 510 Room 2-160

Thursday, June 4, 2015, 12:30 pm

Hosted by: Tomomi Ishikawa

4. JUN

5

Friday

Nuclear Theory/RIKEN Seminar

"Novel mechanisms of charmonium suppression/enhancement in pA and AA collisions"

Presented by Boris Kopeliovich, Universidad Tecnica Federico Santa Maria, Valparaiso

2 pm, Small Seminar Room, Bldg. 510

Friday, June 5, 2015, 2:00 pm

Hosted by: Soeren Schlichting

5. JUN

5

Friday

Nuclear Theory/RIKEN seminar

"Novel mechanisms of charmonium suppression/enhancement in pA and AA collisions"

Presented by Boris Kopeliovich, Universidad Tecnica Federico Santa Maria, Valparaiso

2 pm, Small Seminar Room, Bldg. 510

Friday, June 5, 2015, 2:00 pm

Hosted by: Soeren Schlichting

Charmonium production in pA collisions is known to be suppressed by shadowing and absorption. There are however nuclear effects, which enhance charmonium yield. They steeply rise with energy and seem to show up in LHC data for J/psi production in pA collisions. In the case of heavy ion collisions produced charmonia are additionally suppressed by final state interaction in the created dense medium. On the contrary to current evaluations of the melting effects caused by Debye screening, a charmonium produced with a large pT easily survives even at high temperatures. Another source of charmonium suppression, missed in previous calculations, color-exchange interactions with the medium, leads to suppression of a comparable magnitude. A quantitative comparison is performed.

6. JUN

10

Wednesday

HET/RIKEN seminar

"TBA"

Presented by Wolfgang Altmannshofer, Perimeter Institute

2 pm, Small Seminar Room, Bldg. 510

Wednesday, June 10, 2015, 2:00 pm

Hosted by: Chien-Yi Chen

7. JUN

25

Thursday

RIKEN Lunch Seminar

"TBA"

Presented by Jacobus Verbaarschot, Stony Brook University

12:30 pm, Building 510 Room 2-160

Thursday, June 25, 2015, 12:30 pm

Hosted by: Daniel Pitonyak

8. JUN

26

Friday

Nuclear Theory/RIKEN Seminar

"TBA"

Presented by Jacobus Verbaarschot, Stonybrook University

2 pm, Small Seminar Room, Bldg. 510

Friday, June 26, 2015, 2:00 pm

Hosted by: Soeren Schlichting

1. Nuclear Physics Seminar

"High-pt Hadron Production in Au+Au and d+Au Collisions at sqrt (s) = 200 GeV"

Presented by Sasha Milov, Stony Brook University

Tuesday, July 1, 2003, 11 am
Small Seminar Room, Bldg. 510

2. Nuclear Physics Seminar

"Production of Lambda (1520) at RHIC at sqrt (s) = 200 GeV"

Presented by Ludovic Gaudichet, Subatech, France

Tuesday, July 15, 2003, 11 am
Small Seminar Room, Bldg. 510

3. Nuclear Physics Seminar

"Induced Criticality of Non-Order Parameter Fields"

Presented by Agnes Mocsy, Niels Bohr Institute, Denmark

Tuesday, July 22, 2003, 11 am
Small Seminar Room, Bldg. 510

4. Nuclear Physics Seminar

"Strangeness Production in Au+Au Collisions at RHIC"

Presented by Ben Norman, Kent State University

Tuesday, July 29, 2003, 11 am
Small Seminar Room, Bldg. 510

5. Nuclear Physics & RIKEN Theory Seminar

"Hydrodynamic Afterburner for Color Glass Condensate"

Presented by Yasushi Nara, University of Arizona

Friday, August 8, 2003, 2 pm
Small Seminar Room, Bldg. 510

6. High-Energy Physics & RIKEN Theory Seminar

"Strong Interaction Effect on Muon g-2"

Presented by Masashi Hayakawa, RIKEN/BNL Research Center

Sunday, August 10, 2003, 1:30 pm
Small Seminar Room, Bldg. 510

7. High-Energy Physics & RIKEN Theory Seminar

"Elitzurs Theorem and the Sign Problem"

Presented by Kim Splittorff, Stony Brook University

Wednesday, August 13, 2003, 1:30 pm
Small Seminar Room, Bldg. 510

8. Instrumentation Division Seminar

"Development of Novel Silicon Stripixel Detectors for High energy and Nuclear Physics Experiments"

Presented by Zheng Li, Instrumentation Division

Wednesday, September 10, 2003, 2:30 pm
Large Seminar Room, Bldg. 535

9. Nuclear Physics Seminar

"Discovery of Penta Quarks"

Presented by Prof. Ken-chi Imai, Kyoto University, Japan

Tuesday, October 14, 2003, 11 am
Small Seminar Room, Bldg. 510

10. RIKEN BNL Research Center Workshop

"Collective Flow and QGP Properties"

Monday, November 17, 2003, 9 am
Large Seminar Room, Bldg. 510