Jun 12 – 16, 2017
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Europe/Zurich timezone

The STAR Event Plane Detector - An Upgrade for 2018+

Jun 16, 2017, 11:05 AM
Other Institutes

Other Institutes

Nikhef Science Park 105 1098XG Amsterdam The Netherlands


Mike Lisa (Ohio State University (US))


The first phase of the RHIC Beam Energy Scan program (BES-I)
has revealed intriguing trends in observables as a function of
collision energy in the region $\sqrt{s_{NN}}\sim7-30$ GeV.
These include directed flow and global polarization measurements,
which require an accurate determination of the first-order event
plane. They also include measurement of higher-order moments of
the net-proton distribution, which require an accurate determination
of the collision centrality in a region well-separated from the zone
of interest at midrapidity.

The next phase of the program, BES-II, will explore this region in
greater detail, exploring additional collision energies, improving statistics,
and implementing detector upgrades. The Event Plane Detector (EPD)
is one such upgrade, providing high-segmentation charged-particle
measurements at pseudorapidy $2<|\eta|<5$. This is expected to roughly
double the first-order event plane resolution and provide a separation
$\Delta\eta\gtrsim1$ between the region used for centrality and that
used to calculate the net-baryon moments, greatly reducing
uncertainties from hadronic cross-talk.

The detector consists of two wheels, each composed of 372 tiles of
scintillator read out by wavelength-shifting fibers optically coupled to
silicon photomultipliers (SiPMs). I will discuss the detector design,
as well as results from a prototype and a partial install of the full
detector in RHIC runs 2016 and 2017, respectively. I will also discuss
the production status of the full detector, scheduled for installation
at the end of this year.

List of tracks New methods and facilities

Primary author

Mike Lisa (Ohio State University (US))

Presentation materials