Basic Philosophy of SUSY Photons+MET Selection

Bruce Schumm, SCIPP/UCSCSUSY 2011 Data Workshop17 March 2011

n.b.: We are becoming a general photon + MET signature study, merged with the exotics effort. Probably no impact on the following though…

Bino-Like Neutralino Grid

No visible jet activity when

Mg ~ M

Desecrated plot thanks to Shih/Ruderman, ArXiv 0911.4130

Tevatron Limit In order to be sensitive to full parameter space (esp. mg mB), do not require hadronic activity.

pT of photonsM bino = 150 – 580 GeV

M gluino = 600GeV ( = 0.26pb )

M bino = 200 GeV

M gluino=400–700GeV (=6–0.07 pb)

• BR doesn’t change ~ 80%

• pT of photons ~ similar

• BR changes vs. M bino: • 90% (M bino = 150GeV)• 65% (M bino = 580GeV)

• pT of photons!

Photon pT can be soft for M

small

Production cross-section (7TeV)Wino - like Neutralino: |M2|<< and |M2| < |M1|

Natural for photon+lepton channelNot shown: Higgsino, which has no photonic decay

TRIGGERS?

Back to Bino-like case…

Summary for grid points we have generated so far.

Results are out of 1000 events

Some inefficiency for M = Mg – 30 (haven’t yet explored)

What about ET dependence?

Close to 2g20_loose would be close to knee (remember that current limit is below this, at 150 GeV)

Tentative Conclusions for Bino-Like Case

• We are probably OK for 2g20_loose, and perhaps even 2g25_loose (need to run through M = 150 case)

• Tight electron trigger 90% efficient For e control sample (background estimation),

gXX_loose eXX_tightwhere XX is value of 2g trigger above, should be

fine.

What about a quick peek at non-pointing photons?

GMSB2 sample: c ~ 10s of cm

What about non-photon triggers? Looking into it…

Summary and Conclusions

• Pending a look at M = 150 GeV, proposed 2011 triggers seem workable for Bino case

• Other cases (Wino, Higgsino) being looked into

• Non-pointing photons don’t seem to be captured with photon triggers; what about others? Looking into that also.

Sorry – that’s all folks…