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Register a new userThe RHIC Spin Program: Achievements and Future Opportunities
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E.C. Aschenauer
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This document summarizes recent achievements of the RHIC spin program and their impact on our understanding of the nucleons spin structure, i.e. the individual parton (quark and gluon) contributions to the helicity structure of the nucleon and to understand the origin of the transverse spin phenomena. Open questions are identified and a suite of future measurements with polarized beams at RHIC to address them is laid out. Machine and detector requirements and upgrades are briefly discussed.
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Time and again, spin has been a key element in the exploration of fundamental physics. Spin-dependent observables have often revealed deficits in the assumed theoretical framework and have led to novel developments and concepts. Spin is exploited in many parity-violating experiments searching for physics beyond the Standard Model or studying the nature of nucleon-nucleon forces. The RHIC spin program plays a special role in this grand scheme: it uses spin to study how a complex many-body system such as the proton arises from the dynamics of QCD. Many exciting results from RHIC spin have emerged to date, most of them from RHIC running after the 2007 Long Range Plan. In this document we present highlights from the RHIC program to date and lay out the roadmap for the significant advances that are possible with future RHIC running.
The production of $W$ bosons in polarized $p+p$ collisions at RHIC provides an excellent tool to probe the protons sea quark distributions. At leading order $W^{-(+)}$ bosons are produced in $bar{u}+d,(bar{d}+u)$ collisions, and parity-violating single-spin asymmetries measured in longitudinally polarized $p+p$ collisions give access to the flavor-separated light quark and antiquark helicity distributions. In this proceedings we report preliminary results for the single-spin asymmetry, $A_L$ from data collected in 2012 by the STAR experiment at RHIC with an integrated luminosity of 72 pb$^{-1}$ at $sqrt{s}=510$ GeV and an average beam polarization of 56%.
I review progress toward the experimental study of polarized proton collisions at RHIC, at center-of-mass energies of several hundred GeV. The tools under development for these experiments are summarized, with emphasis on the complementarity for the spin program of the two major detectors, PHENIX and STAR. The proposed research program includes measurements of the spin structure of hadrons, tests of QCD predictions for spin observables, and polarization searches for interactions beyond the Standard Model. I argue, in particular, that RHIC should provide the best determination of the gluonic contribution to proton spin foreseen for the coming decade.
Highlights of news from Brookhaven National Laboratory (BNL) and results from the Relativistic Heavy Ion Collider (RHIC) in the period July 2016-2017 are presented. 2017 was the 70th birthday of Brookhaven National Laboratory which was built starting in 1947 on Camp Upton, a military base in 1917 for World War I and in September 1944 for World War II. Highlights in 70 years of research at BNL are presented, which include 6 Nobel Prizes as well as other important discoveries and inventions. RHIC is the worlds only polarized proton collider and a review of the establishment of the Riken BNL Research Center with research focus on spiin physics at RHIC is presented. Discoveries at RHIC in Jet Quenching and the Quark Gluon Plasma are reviewed as well as new ideas on flow in small systems including a measurement of the vorticity of the QGP via polarization of $Lambda$ hyperons. An attempt at measuring the transport coefficient $hat{q}$ of the Quark Gluon Plasma from azimuthal broadening of high $p_T$ di-hadron pairs is presented.
Recent soft physics results from collisions of ultra-relativistic nuclei at Relativistic Heavy Ion Collider (RHIC) operating at Brookhaven National Laboratory (BNL) are reviewed. Topics discussed cover the Beam Energy Scan program with some emphasis on anisotropic particle flow.
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