1. Open Reading of the SUSY Photon+X+MET Paper
Bruce Schumm, UCSC/SCIPP for the
Diphoton
Photon + B
Photon + jets
Photon + lepton
analysis groups.
08 June 2015 Open Reading

2. Perpetrators
08 June 2015

3. Effectively massless gravitino LSP ( MET) EW-ino NSLP
Physics Target
All four analysis target different scenarios of Generalized Gauge Mediated SUSY (GGM) (SUSY breaking that naturally incorporates flavor symmetries that seem to manifest in nature)
All four essentially explore simplified model with the following content:
Effectively massless gravitino LSP ( MET)
EW-ino NSLP
Except for Wino-NLSP model explored by the photon+l analysis, additional NNLSP state(s) (e.g. gluino).
Production can proceed both through NNLSP as well as, if coupling is appreciable, NLSP.
Note that coupling is NOT appreciable if NLSP is the bino!
08 June 2015

4. GGM Models  Photon+X Signatures
Red = first public result and publication draft
Blue = prior public result but first publication draft
Analyses not developed with idea of single paper in mind  some “harmonization” done after preliminary results presented
Now under single umbrella for 13 TeV
08 June 2015

5. Diphoton Analysis Models and Signatures
Two models:
Strong production: Gluino NNLSP, Bino NLSP
Electroweak production: Wino NNLSP, Bino NLSP
Note: this is the 2015 grid; for demonstration only!
B(Bino  )  cos2W for any bino mass
Two photons in final state
Also require significant Meff
Two SRs for each grid (one each for low, high bino mass)
Note: this is the 2015 grid; for demonstration only!
08 June 2015

6. Diphoton Analysis: Expected Background and Observed Number of Events
Observation of 5 events in SRW-L is 6% likely (not including the look-elsewhere effect for the other SRs)
08 June 2015

7. Photon+b Analysis Models and Signatures I
Note that μ<0 leads to significant BF(χ10  hG)
Adjusting relative size of the gaugino/higgsino mass parameters M1 and μ controls the admixture of the χ10 and thus its branching
Choose M1 and μ so that BF(χ10  hG): BF(χ10  G)  1.7:1
For this value the photon+b analysis is expected to provide greatest advantage relative to the other photon+X analyses.
08 June 2015

8. Photon+b Analysis Models and Signatures II
STRONG
PRODUCTION
ELECTROWEAK
PRODUCTION
Define two SRs: one for strong and one for EW production
In addition to photon and b jet(s), strong prod SR requires significant HT
08 June 2015

9. Photon+jets Analysis Models and Signatures
Engineered with ad hoc function of M1 and μ
With μ>0, the BF(χ10  hG) is more or less replaced with BF(χ10  ZG), leading to additional jets in the event.
Again define two SRs, for low and high χ10 mass, respectively.
In addition to photons and jets, require
significant HT for the high-mass SR
for the low-mass SR, four leading jets must be less than 85% of all hadronic energy
08 June 2015

10. Again, no significant excess over background.
Photon + jets Analysis: Expected Background and Observed Number of Events
Again, no significant excess over background.
08 June 2015

11. Photon+lepton Analysis Models and Signatures
What if a GGM neutralino is the only thing accessible?
If bino-like, will not be seen
If higgsino-like, see photon+b (and photon+j)
If wino-like, look for leptons
 Photon + lepton analysis
Separate but similar e,μ channels
Requires small HT but significant
Requires significant lepton-photon system transverse mass
Z peak excluded for electron channel
Single free parameter of model is the mass of the three degenerate wino states
08 June 2015

12. Photon + jets Analysis: Expected Background and Observed Number of Events
No significant excess…
In summary, 10 SRs for four signatures:
08 June 2015

13. GGM Signature Search Summary
Excluded visible cross section ranges from 150 to 700 ab
08 June 2015

14. Diphoton Model-Dependent Limits Change from low-mass to high-mass SR
08 June 2015

15. Photon+b Model-Dependent Limits Electroweak production
08 June 2015

16. Photon+j Model-Dependent Limits
08 June 2015

17. Photon+lepton Model-Dependent Limits
08 June 2015

18. BACKUP
22 April 2014