Abstract
sPHENIX is a major upgrade to the PHENIX detector enabling high-rate, large acceptance measurements of upsilons, direct photons and fully reconstructed jets in p-p, p-A and A-A collisions at the Relativistic Heavy Ion Collider (RHIC). These detailed measurements will probe the Quark Gluon Plasma near its transition temperature, in a region of strongest coupling. The sPHENIX detector consists of hadronic and electromagnetic calorimetry, and charged particle tracking in conjunction with the recently acquired 1.5 tesla BaBar super-conducting solenoid. The sPHENIX acceptance of 2π in azimuth and |η | < 1.1 in pseudo-rapidity provides a factor of six improvement over the present PHENIX central spectrometer. Beyond being an excellent RHIC detector, sPHENIX provides an outstanding foundation for a detector focused on the physics of a possible future electron-ion collider at RHIC (eRHIC). In this talk we will discuss the physics potential of the sPHENIX detector, the design and technology choices for the sPHENIX calorimeters, and the conceptual design of a day-one detector for eRHIC.
Highlights
The PHENIX collaboration has proposed a major upgrade to the PHENIX detector, sPHENIX, to address detailed questions about the nature of the Quark-Gluon Plasma (QGP)
The sPHENIX detector will replace the current PHENIX detector with a new detector consisting of a super-conducting solenoid magnet, hadronic and electromagnetic calorimetry and charged particle tracking
The high multiplicity on heavy ion collisions require a segmentation of δη × δφ ∼ 0.1 × 0.1 for the hadronic calorimeter and δη × δφ ∼ 0.025 × 0.025 for the electromagnetic calorimeter
Summary
The motivation for studying jets at RHIC develops from soft sector measurements. These measurements point to a small viscosity hydro evolution that favors a strongly coupled medium which is the center of the emerging model of heavy ion collisions. Based on the current performance of the RHIC accelerator and 20 weeks of physics running, estimates have been made on the number of jet events that are expected under different conditions. Improvements in the performance of the accelerator are expected to result in larger jet samples these estiamtes
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