Bulletin of the American Physical Society
2013 Fall Meeting of the APS Division of Nuclear Physics
Volume 58, Number 13
Wednesday–Saturday, October 23–26, 2013; Newport News, Virginia
Session PA: Probing for Evidence of Saturation via p(d)A Collisions |
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Chair: Agnes Mocsy, Pratt Institute Room: Grand Ballroom I |
Saturday, October 26, 2013 10:30AM - 11:06AM |
PA.00001: Big Questions from a Small System: Recent d+Au Results from RHIC Invited Speaker: Anne Sickles d+Au collisions were originally done at RHIC as a control measurement for understanding the effects of hot nuclear matter seen in collisions of two heavy nuclei. However, recent measurements from d+Au collisions have been some of the most interesting to come out of the most interesting to come out of the Relativistic Heavy Ion Collider (RHIC). Correlation measurements over a wide range in pseudorapidity have shown suppression of back-to-back correlations. Hadron correlations measurements have long range in pseudorapidity correlations, similar to observations in heavy ion collisions which are now understood to be the result of the geometry of the initial state followed by a hydrodynamic evolution of the system. Whether this is also the case for d+Au collisions is currently an open question and Color Glass Condensate effects are another proposed explanation. The spectra of hadrons are also modified from p+p collisions, with an increase in the proton to pion ratio, similar to what is seen in Au+Au collisions. Observation of this phenomena in d+Au collisions is very intriguing since in Au+Au collisions the excess protons are commonly understood to be from recombination of partons into final state hadrons. In this talk we will discuss the current measurements and how they impact our understanding of heavy ion collisions. Future measurements, exploiting the versatility of RHIC, which will discriminate between effects sensitive to the geometry of the initial state by changing the small nucleus (p, $d$, ${}^{3}$He) and saturation physics by varying the size of the large nuclei will also be discussed. [Preview Abstract] |
Saturday, October 26, 2013 11:06AM - 11:42AM |
PA.00002: Summary of results on pPb collisions at the LHC Invited Speaker: Constantin Loizides A comprehensive summary on the experimental results from proton-lead collisions at the LHC will be given. Where possible, the data will be compared to model calculations, or to similar measurements at lower collision energies. [Preview Abstract] |
Saturday, October 26, 2013 11:42AM - 12:18PM |
PA.00003: Evidence of Saturation via p(d)A Collisions: Theory Confronts Data Invited Speaker: Adrian Dumitru It is nowadays established that the density of soft gluons in a hadron grows rapidly with energy. It is thought that nonlinearities of the gluon fields generate dynamically a typical transverse momentum scale Qs, the so-called saturation scale. Its dependence on energy and nuclear mass number follows from nonlinear evolution equations. One of the main goals of the p+p, p+A, and A+A collision programs at the BNL-RHIC and CERN-LHC colliders is to test general theoretical expectations and the accuracy of currently available computational frameworks. These tests include single-inclusive particle production, multiplicity distributions, and multi-particle azimuthal and rapidity correlations. [Preview Abstract] |
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