SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses
description
Transcript of SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses
![Page 1: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/1.jpg)
SUSY with Photons and MET: Introduction and thoughts about
Diphoton and Single Photon AnalysesAnnecyDESY/University of HamburgLiverpool UniversityTokyo TechUniversity of California Santa CruzUniversidad Nacional de La PlataUniversity of WisconsinWeizmann Institute
![Page 2: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/2.jpg)
General Intro
![Page 3: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/3.jpg)
Photon processes in SUSY
mSUGRA
• LSP: lightest neutralino• NLSP: 2nd neutralino• production: 1-loop
GMSB
• LSP: gravitino ( massless)
• NLSP: lightest neutralino• production: tree level
Collider phenomenology depends on nature of LSPs
Signature: + MET (+ X)
This group’s focus so far
![Page 4: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/4.jpg)
What is the X in “(+X)”?This depends on the composition of the NLSP 0:• 0 = Bino B(0 G) ≈ 80% X = 2nd • 0 = [Bino Wino] X = lepton (Jovan)• 0 = [Bino Higgsino] X = b-jet(s) (Ofir)• 0 = [Bino ???] X = as little as possible (CMS: 3 jets with 30 GeV ET.
Other notes:• If Mcolored ≈ M0, additional activity can be very limited
• If G (gravitino) coupling is weak, 0 can be metastable (non-pointing photons!) (Helen)
![Page 5: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/5.jpg)
Diphoton Analysis
![Page 6: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/6.jpg)
Basic Selection: • 2 with PT > 25 GeV• MET > 125 GeV
![Page 7: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/7.jpg)
![Page 8: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/8.jpg)
![Page 9: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/9.jpg)
![Page 10: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/10.jpg)
![Page 11: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/11.jpg)
Limits: Cast in 2D space of Mcolored vs MBino
![Page 12: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/12.jpg)
N.B. Comparison with CMSIn terms of the observed cross section limit, CMS and ATLAS are essentially identical (~25 fb-1), and:
• These can be directly compared (same syst. error content)
• P(e)CMS ≈ 0.1*P(e )ATLAS
• CMS used slightly (~6%) more luminosity
• CMS got slightly lucky (expected 1.5; observed 0)
Despite appearances (mass limit), ATLAS analysis appears superior per fb-1
In addition, ATLAS did not optimize for 1 fb-1 (we used essentially the same analysis as for 0.036 fb-1)
We need to optimize; should result in favorable analysis relative to CMS
![Page 13: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/13.jpg)
Diphoton Analysis: Next StepsFirst things first: we need to explore (clean up?) MET variables for events with high PT photons. From Jason:
Not all of our recovered photons are treated correctly by the MET reconstruction, and we have some anecdotal evidence from our high-MET candidates that this is worse in high-pT photon events. Probably this is because of the straight scaling EM->hadronic JES; this makes the size of the (wrongly applied) correction larger for the high-pT photons.
This will have to be explored at AOD stage and brought forward (officially) into the D3PDs
![Page 14: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/14.jpg)
Diphoton Analysis
![Page 15: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/15.jpg)
Diphoton Analysis
![Page 16: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/16.jpg)
Diphoton Analysis
![Page 17: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/17.jpg)
Diphoton Analysis
![Page 18: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/18.jpg)
SUSY single photon + MET + X
University of California Santa CruzUniversidad Nacional de La Plata
![Page 19: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/19.jpg)
SUSY- Broken in nature
via gravity (mSUGRA)
via gauge mediation (GMSB)
At low energies, most scenarios with similar spectra…
…but possible different phenomenologies at colliders.
(mSUGRA) (GMSB)
![Page 20: SUSY with Photons and MET: Introduction and thoughts about Diphoton and Single Photon Analyses](https://reader035.fdocuments.net/reader035/viewer/2022070411/5681484b550346895db56049/html5/thumbnails/20.jpg)
Experimental SignatureTrigger:- EF_g40_loose_xe45_medium_noMu/EF_g40_loose_xe55_medium_noMu triggers?- g80_loose g100_loose (5. 1033 ) ?
Selection: - |η| range, Photon pT , Photon quality :Tight?, Etcone (Calo isolation) vs Ptcone (track
isolation)? MET definition, i.e. MET_RefFinal? ( Currently use LocHadTopo) number of Jets?
Efficiencies:- Follow photon efficiency task force!- MET: Bruce please add…..
Background: data driven methods- QCD: Prompt photon (direct / fragmentation) follow SM analysis- W, Z ttbar…