STAR Forward Upgrade Plan Overview
This document outlines the STAR Forward Upgrade Plan proposed by Carl Gagliardi at Texas A&M University. The plan includes replacing FMS with Pb-scintillator EMcal, using APDs for read-out, and implementing Si disks for tracking. The design allows for greater particle discrimination and vertex determination. The cost estimation and detailed applications like Drell-Yan processes are also discussed.
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STAR Forward Upgrade Carl Gagliardi Texas A&M University 2016 Spin Plan Face-to-Face Meeting Oct 11, 2015
Basic plan Replace FMS with 2 x 3 m2wall of PHENIX Pb-scintillator EMcal Use APDs for read-out, similar to ALICE Insensitive to magnetic field and can tolerate the radiation field 2.3 < eta < 4.0 Back it with a 4-interaction length thick Pb-scintillator plate Hcal Very compact design allows it to fit in front of the DX magnet 2.3 < eta < 3.7 3 Si disks for tracking Charge-sign discrimination Zvertexdetermination to separate particles from different interactions within the same bunch crossing Our Heavy Ion colleagues are still investigating if/how they might utilize the forward tracking in A+A Enlarge the existing pre-shower detector to cover full 2 x 3 m2area Total cost: approximately $6M 2 STAR Forward Upgrade -- Carl Gagliardi
Forward calorimeters 3 STAR Forward Upgrade -- Carl Gagliardi
Proposed Si disk implementation 4 STAR Forward Upgrade -- Carl Gagliardi
Worked out example: Drell-Yan By far the most challenging application! Detailed simulations of electrons and negative pions have been performed to determine the e/h discriminating power STAR Forward Upgrade -- Carl Gagliardi 5
Drell-Yan S:B in 200 GeV collisions LO DY 4.0GeV < M < 6.0GeV NLO DY 4.0GeV < M < 6.0GeV LO + NLO DY 4.0GeV < M < 6.0GeV 2 -1.5 2 -1.5 2 -1.5 ) (x ) (x ) (x 10 10 10 8 log log log 60 60 -2 -2 -2 Simulation is for 500 pb-1 of p+p collisions at 200 GeV S:B in p+A at 200 GeV should be similar 7 50 50 6 -2.5 -2.5 -2.5 40 40 5 4 30 30 -3 -3 -3 3 20 20 Probes the nuclear target at x2 ~ 10-3 with x1, x2, Q2 measured event-by-event 2 -3.5 -3.5 -3.5 10 10 1 -4 0 -4 0 -4 0 -2 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 -2 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 -2 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 log (x ) log (x ) log (x ) 1 1 1 10 10 10 6 STAR Forward Upgrade -- Carl Gagliardi
