sPHENIX bulk physics topical group

["Mickey Chiu" <chiu AT bnl.gov>]

Hi,

Attached please find my draft abstract for the APS global meeting this coming
March for approval.  The abstracts are due by end of day tomorrow.


Feasibility Study for Ultraperipheral Collisions in sPHENIX

The sPHENIX experiment will take Au+Au collision data in 2025.  While
optimized for measuring upsilons and jets, its much increased data acquisition
rate capability and large acceptance makes it also possibly a great detector
for studying ultra-peripheral collisions (UPC).  There are two possible
methods for collecting a large UPC data sample in sPHENIX.  One relies on a
traditional hardware triggered approach.  The other exploits the streaming
capabilities of the tracking detectors.  In this mode, the tracking detectors
will continue to send up to 50 us of data after each trigger, thus collecting
a large fraction of all collisions.  While advantageous for statistics, there
are drawbacks to using only the tracking detectors.  Among these are the
susceptibility to backgrounds from inelastic collisions and from beam
backgrounds.  Another challenge is the poor particle ID capability.  We
present studies of the feasibility of this streaming approach for UPC J/Psi
data collection in sPHENIX.  These studies explore the above challenges and
others, and provide estimates for the signal to noise for UPC J/Psi’s that we
might expect from the coming final sPHENIX Au+Au.


Sincerely,
Mickey