sPHENIX tracking discussion

["Ming Liu (ming AT bnl.gov)" <ming AT bnl.gov>]

Hi all,

Here are two MAPS related poster abstract we would like to submit to QM17. Haiwang et al are going to submit a third poster on b-jet tagging algorithms.

 

Your comments and suggestions are welcome!

Cheers,

Ming 

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Title: B-tagged jets at RHIC with MAPS inner tracker in sPHENIX

Cesar da Silva, Mike McCumber and Sanghoon Lim, Los Alamos

 

Flavor dependency of jet quenching in the QGP is an important tool to study radiative and collisional energy loss in the medium using probes of different mass scales. B-tagged jet nuclear modification measured by LHC experiments have not shown strong parton flavor dependency at high pT, where the quark mass is much smaller than pT scale. The proposed sPHENIX experiment at RHIC will measure B-tagged jets at lower p_T ~ 10-30 GeV/c, which is closer to the B-quark mass scale than that in LHC. Monolithic Active Pixel Sensor (MAPS) technology has been proposed to provide precision displaced vertex measurements in high occupancy heavy ion environments. The implementation of a MAPS detector in sPHENIX, physics performance projection and possible impacts to the field of heavy ion physics will be discussed.

 

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Title: The sPHENIX MAPS Inner Tracker R&D

Ming Liu, Patrick McGughey, Mark Prokop and Walt Sondheim, Los Alamos

 

One of the three physics pillars of the proposed sPHENIX experiment is to study the QGP properties with heavy bottom quark jets (B-jets) produced in high-energy heavy ion collisions. B-jets offer a unique set of observables due to the large bottom quark mass, but need to be measured across an unexplored kinematic regime, particularly at low pT where the expected mass-dependence effects are large but also the underlying background are also high. To meet the experimental challenges, we propose to use a 3-layer Monolithic-Active-Pixel-Sensor (MAPS) based pixel detector, originally developed for the ALICE ITS upgrade, for the sPHENIX inner most tracking system, covering radius from 2cm to 6cm and rapidity over +/- 1.1. The very fine 28x28 um pixels allow us to precisely determine the B-decay secondary vertex from the primary interaction point and identify B-jets in heavy ion collisions with high efficiency and high purity. We take advantage of 15+ years of ALICE ITS upgrade R&D work to develop custom readout and mechanical systems to meet the sPHENIX requirements. In this presentation, we show the current status of R&D effort of integrating the MAPS-based detector into the sPHENIX system.   

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Ming Xiong Liu

P-25, MS H846 TEL: 505-667-7125 

Physics Division 631-344-7821(BNL)

LANL 630-840-5708(FNAL)

Los Alamos, NM 87545 FAX: 505-665-7020