Geometry tagging for heavy ions at JLEIC

Geometry tagging R&D for heavy ions at JLEIC

Introduction

Electron-ion collisions naturally form a major part of the physics program at the Electron-Ion Collider (EIC). In particular, they are essential for realizing key goals of the program for studying QCD, such as investigating parton/hadron propagation in cold nuclear matter, as well as coherence phenomena and QCD at large gluon densities in nuclei. These measurements can be made even more incisive using forward going particles in the ion direction to tag the geometry of the collisions on an event-by-event basis. The large-acceptance detector at the JLab EIC (JLEIC), with full acceptance for forward-going neutrons, protons and nuclear fragments, is ideally suited to such measurements. In fact, the highly integrated interaction region constitutes a unique strength of the JLEIC design approach. In order to fully exploit this technical advantage, this needs to be tied quantitatively to its physics impact, and physics tradeoffs need to be explored between detector capability and the accelerator in terms of the IR design. Therefore, a detailed simulation of these physics processes is currently the highest priority item for finalizing the JLEIC IR design, and optimizing the detector capabilities in preparation for CD0.

To address this issue, we start this LDRD project as a joint effort between the physics and accelerator divisions, with a strong involvement from experts in high-energy nuclear reactions. Specifically, we propose, over the next two years, to apply existing modeling tools (DPMJetHybrid and Sartre) to investigate and develop the geometry tagging capabilities of the JLEIC large-acceptance detector for two of the highest priority items in the EIC White Paper. We will use DPMJetHybrid to address the issue of color propagation in cold nuclear matter, while with Sartre we will address gluon saturation using exclusive diffractive processes. In the second year, we also propose to apply DPMJetHybrid to the e+A program at JLab 12 GeV, where hadron propagation in cold matter constitutes a substantial part of the physics program.

Next Meeting

The next meeting of the Geometry tagging for heavy ions at JLEIC will take place at 8-9am Eastern on January --, 2017.

Talks and Files

2017-02-03

• Baker, Mark Sartre @ JLAB
• Wei, Guohui Update: 10,000 events simulation and distribution in second focus point

2017-01-19

• Baker, Mark BeAGLE @ JLAB
• Wei, Guohui Update: Method to track residual baryon in GEMC

2016-12-06

• Baker, Mark Meaning of d
• Baker, Mark Bonus Slides

2016-11-22

• Baker, Mark Beagle Update
• Wei, Guohui Update on Geometry Tagging

2016-11-08

• Toll, Tobias Cross-Section Tables with Sartre
• Wei, Guohui Update on Geometry Tagging
• Baker, Mark Thoughts on Sartre ePb

2016-10-25

• Baker, Mark D. LDRD Kickoff

Other Files or Materials

• LDRD: Geometry Tagging For Heavy Ions At JLEIC
• LDRD: 2017-LDRD-6: Geometry tagging for heavy ions at JLEIC
• LDRD Proposal Prep: Mark D. Baker - 4/2016 - Proposal Issues
• LDRD Proposal Prep: Mark D. Baker - 4/2016 - Proposed Proposal Outline