Some Thoughts and Pleas from the SCIPP (UC Santa

Cruz) Group

US ATLAS e Forum Meeting

June 27 2008

Bruce Schumm, UCSC/SCIPP, for Alan Litke, Jason Nielsen (faculty) Jovan Mitrevksi (Postdoc), Gabe Hare (Student)

Conversions of Non-Pointing Photons from

GMSBTypical GMSB signatures:

Neutralino/Stau decay length depends on coupling to gravitino…

~

g~

~

g~

Gauge-Mediated Supersymmetry Breaking

Scenarios with in-flight decay not disfavored by cosmological constraints

For a reasonable range of, e.g., gravitino mass, signature would be kinked track (possible with change in rate of

ionization loss

For neutralino channel, signature is non-pointing photons and their converions.

SCIPP: Explore conversion reconstruction for non-prompt, non-pointing photons.

• Pushes capabilities of TRTSeeded tracking

• Dataset identified that has non-prompt (confirmed by Stephen Swedish, U. Alberta): misal1_mc12.005411.GMSB2_jimmy_susy.digit.RDO.v12000502_tid005449

Have reconstructed sample in 14.1.0

Hoped to make plots from InDetRecStat ntuple, but realized no neutrals retained

Need to learn to use AODs etc. (next step)

Others

Jovan Mitrevski: Considering constributing to reconstruction of non-converting non-pointing photons (calibration issues)

Alan Litke: Literature review; also deciding where to fit in.

All in all, pretty vague, but hope to change that soon!