1 / 23

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.

neka
Télécharger la présentation

Generator level study of gamma +MET using Sherpa

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related