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Generator level study of gamma +MET using Sherpa

Sandhya Jain Satyaki Bhattacharya ‏ University of Delhi, Delhi. Generator level study of gamma +MET using Sherpa. Introduction. In 1998, Large extra dimension (LED) were proposed as a solution to hierarchy problem by ADD.

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Generator level study of gamma +MET using Sherpa

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  1. Sandhya Jain Satyaki Bhattacharya‏ University of Delhi, Delhi Generator level study of gamma +MET using Sherpa

  2. Introduction • In 1998, Large extra dimension (LED) were proposed as a solution to hierarchy problem by ADD. • It builds up saying that gravity can propagate in extra dimensions giving rise to a relation given as, Mpl^2 = Md^(n+2) * R ^n where, R is the size of compactified Extra-Dimension, Md and n are the parameters of the theory. • Gravitational field in extra-dimensions is carried by a particle called graviton whose signatures can be found at LHC. • For a direct graviton production, MET becomes a signature. • So, I am interested in looking for  + MET as the signal for the direct graviton production at LHC.

  3. Sherpa- A Monte Carlo Event Generator • produces events that are qualified to be put into detector simulations used by various experiments. • versatile to inbuilt matrix element and phase space generator AMEGIC ++ & PHASIC ++ which calculate and integrate tree level amplitudes. This feature makes Sherpa to be used as cross section integrator and parton level event generator as well. • provides the implementation of CKKW merging, which provides the improved description of multi jet production processes .

  4. Feynman Diagrams contributing at tree level q q q q q q q q

  5. Cross-section Vs n at Md = 2TeV • As n increases, the x-section decreases.

  6. Cuts used • pt of  > 100 GeV • Md = 1TeV, 2TeV • Ecms = 10.0 TeV CMSSW 2_2_4 is being used for this studies.

  7. Graviton Distributions Energy Distribution (Md = 1TeV)‏ Energy Distribution (Md = 2TeV)‏

  8. Pt Distribution (2TeV)‏ Pt Distribution (1TeV)‏

  9. Pl Distribution (2 TeV)‏ Pl Distribution (1 TeV)‏

  10. Mass Distribution (2TeV)‏ Mass Distribution (1TeV)‏

  11. Eta distribution(1TeV)‏ Eta distribution(2TeV)‏

  12. Phi distribution(2TeV)‏ Phi distribution(1TeV)‏

  13. Photon Distributions Energy distribution(2TeV)‏ Energy distribution(1TeV)‏

  14. Pt distribution(2TeV)‏ Pt distribution(1TeV)‏

  15. Pl distribution(1TeV)‏ Pl distribution(2TeV)‏

  16. Eta distribution(2Tev)‏ Eta distribution(1TeV)‏

  17. Phi distribution(1TeV)‏ Phi distribution(2TeV)‏

  18. Photon pl / graviton pl(1TeV)‏ Photon pl / graviton pl(2TeV)‏

  19. Photon pt / graviton pt(2TeV)‏ Photon pt / graviton pt(1TeV)‏

  20. delta phi (2TeV)‏ delta phi (1TeV)‏

  21. cos(theta) (2TeV)‏ cos(theta) (1TeV)‏

  22. Summary & Future Plans • Till the time of last meeting, I was looking at the photon reconstruction at CMS using CMSSW (keeping in mind a search with photon in the final state). • I have just started looking at the generator level plots of MET+ gamma (signal). • I have presented my initial results with CMSSW_2_1_10 in the QCD photons group while at CERN in January. • As my next step, I would like to do a study of Z gamma at generator level where Z -> bar, which is a background to this process. • Then, would like to proceed with the simulation and reconstruction.

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