Open Reading of the SUSY Photon+X+MET Paper

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Presentation transcript:

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

Perpetrators 08 June 2015

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

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

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

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

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

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

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

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

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

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

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

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

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

Photon+j Model-Dependent Limits 08 June 2015

Photon+lepton Model-Dependent Limits 08 June 2015

BACKUP 22 April 2014