DU @ CMS March 01, 2011 BARC, Mumbai Ram. K. Shivpuri University of Delhi
OVERVIEW THE DU GROUP HARDWARE SOFTWARE PHYSICS CONCLUSION
A glance at Delhi University (DU) Established in 1922, DU is the premier university of the country and is known for its high standards in teaching and research and attracts eminent scholars to its faculty. At present, there are 16 faculties , 86 academic departments and 77 colleges and 5 other recognised institutes spread all over the city, with about 3,90,000 students . DU has one of the largest number of Centres of Advanced Studies recognized by the UGC.
A glance at Delhi University The University has 15 libraries in addition to the libraries in the Colleges. The University Science Instrumentation Centre (USIC) has a number of sophisticated research instruments which are used by several departments of the University and by other institutions in Delhi and its neighbourhood. The University has fibre-optic networks on the North and South Campuses.
THE DU GROUP Started in 1970s, DU group participated in International Collaborations like E706 and is in DZERO (4 students got PhD) Emulsion/Bubble Chamber Experiments (16 PhD) Current strength in the CMS Experiment 7 Faculty Members 15 Ph.D. Students + More to join
HARDWARE DU & BARC, Mumbai- Responsibility to fabricate 1000 Si Microstrip detectors for Preshower Detector INFRASTRUCTURE CLEAN ROOM-Class 1000 Two laminar flow tables – class 100 I-V, C-V System (Keithley based) Measurement setup - KEITHLEY-237, KEITHLEY-590, KEITHLEY-2410 & Probe Station
HARDWARE Si Detector for Preshower detector for CMS The development of Si detectors with the desired characteristics was achieved in two phases. Simulation – For extracting Process Parameters and Device Characterization. Measurement set ups - Current-Voltage (I-V) and Capacitance-Voltage (C-V). (12 Papers, 2 CMS Notes, 5 PhDs)
HARDWARE Process Simulation : TSUPREM-4 To develop a robust and reproducible fabrication technology, the process simulation was carried out using two dimensional process simulator, T- SUPREM IV and was optimized for annealing temperature, ion-implantation dose and annealing time for the CMS detectors. Device Simulation : TMA MEDICI A complete analysis of the effect of various physical and geometrical parameters on these structures was performed with two-dimensional device simulator, TMA-MEDICI for optimization purposes.
HARDWARE Keithley Measurement setup was installed by DU group at BEL, Bangalore to carry out measurements. A total of 1000 detectors was fabricated at BEL and delivered to CERN which met their specifications.
TIER-3 CLUSTER A small cluster of few nodes - acquired Master/Worker Nodes and NAS. Proceed with the SW installation Video conferencing facility : Plan to go ahead with CMS Center Good bandwidth for CMS work
PHYSICS QCD Higgs + jet, H → ZZ* Direct Photon DU GROUP MIS Exotica
PHYSICS Direct Photon physics (1 PhD awarded, 1 ongoing + 1 faculty) Higgs Physics ( 1PhD + 2 Faculty) Excited quark / lepton searches (1 PhD awarded, 1 ongoing + 2 Faculty) LED based on MET+JET ( 1PhD + 1 faculty) Anomalous tri-linear gauge boson coupling ( 1PhD + 1 faculty) Model Independent Searches ( 1PhD + 1 faculty)
PHYSICS Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at √ s = 7 TeV CMS QCD 10-19 CMS QCD 10-19 Measured isolated prompt photon Ratio of the measured isolated prompt differential cross section and NLO pQCD photon differential cross section to the predictions, as a function of E g T. NLO pQCD predictions..
PHYSICS +Jet Analysis The LO (after full simulation) and theoretical LO and NLO calculations for the cross-section of γ +jet events as a function of PγT . The calculated points have been complemented by lines fitting the corresponding cross sections
PHYSICS Measurement of the Isolated Diphoton Cross-Section in CMS at √ s = 7 TeV CMS PAS QCD 10-35 The measured differential cross section of pp → for both photon in barrel and comparison with the theory predictions from ResBos & Diphox.
PHYSICS H->ZZ* -> 4l - tt~ Background GEN + SIM + RECO - Vertexing and isolation studies - first feasibility studies performed using Boosted Decision Tree (BDT) CMS AN 2010/237
PHYSICS H->ZZ* -> 2l2nu channel - Participating in the 2e2nu analysis (starting from the feasibility studies) – important channel for M H > 200 GeV - Working on all aspects – Data/MC comparison; Trigger studies; Data-driven background estimation; etc. Inclusive Z and W cross-sections - Working on Muon efficiencies – ID, CMS AN-Note-10-279 Reco, Trigger, Isolation etc.
PHYSICS Model Independent Searches (MIS) - MIS is a search for a deviation from expectation without any bias in choosing a particular model - Analysis going for Moriond 1muon+2gamma+MET excl. & 2muon+1jet+MET incl. Preliminary Preliminary
PHYSICS Search for Excited Leptons EXO-10-016 IN PROGRESS
PHYSICS Search for Excited Quarks in qq → at the CERN LHC Achievable exclusion contours in the Mq parameter space corresponding to different integrated luminosities at the LHC. The regions below the curves can be ruled out at 99% CL
PHYSICS Quark Excitations Through the Prism of Direct Photon Plus Jet at the LHC (a) Mq = 1TeV (b) Mq = 5TeV Invariant mass of −jet system for Signal+Background and Background after all the isolation and kinematical cuts.
PHYSICS Quark Excitations Through the Prism of Direct Photon Plus Jet at the LHC Required integrated luminosity as a function of Mq for (a) 5 and (b) 3 significance for two different coupling strengths (systematic uncertainties are not included).
CONCLUSION 8 Ph.D’s awarded from CMS work Kirti Ranjan Ashutosh Bhardwaj Sudeep Chatterji M.K. Jha Ashish Kumar Ajay Srivastava Sushil Kumar Pooja Gupta
PUBLICATIONS - HARDWARE 1. “High -voltage planar Si detectors for high-energy physics experiments: comparison between metal-overhang and field-limiting ring techniques”, K. Ranjan, A. Bhardwaj, Namrata, S. Chatterji, A. K. Srivastava, Ashish Kumar, Manoj Kumar Jha and R. K. Shivpuri, Solid State Electronics 48, 1587-1595 (2004) . 2. “S imulation Study of irradiated Si sensors equipped with metal-overhang for applications in LHC environment”, S. Chatterji, A. Bhardwaj, K. Ranjan, Namrata, A.K. Srivastava, Ashish Kumar, Manoj Kumar Jha, S.L.Khanna and R. K. Shivpuri, IEEE Trans. Nucl. Sci 51(2), 298- 312 (2004). 3. “Breakdown voltage analysis of neutron irradiated silicon detectors”, A. Bhardwaj, K. Ranjan, Namrata, S. Chatterji, A. K. Srivastava, A. Kumar, M. K. Jha and R. K. Shivpuri, Eur. Phys. J. AP. 24, 171(2003). 4. “Analysis of interstrip capacitance of Si microstrip detector using simulation approach”, S. Chatterji, A. Bhardwaj, K. Ranjan, Namrata, A. K. Srivastava and R. K. Shivpuri, Solid State Electronics 47, 1491 (2003). 5. “Comparison of p + n junction Formed by BF 2 + and Boron Implantation in Silicon Microstrip Detector with Low and High Thermal Budget: Impact of Fluorine on Electrical Characteristics”, Ajay K. Srivastava, A. Bhardwaj, K. Ranjan, Namrata, S. Chatterji, and R. K. Shivpuri, Material Science in Semiconductor Processing Vol.6, Issues 5-6, 555-559 (2003). 6. “Study of parton kT smearing effects in direct photon production at the Fermilab, Tevatron”, A. Kumar, … , A. Bhardwaj, et al., Physical Review D 68, (July 2003). 7. “Study of direct photon production at the CERN LHC”, A. Kumar, … , A. Bhardwaj, et al., Physical Review D 67, 014016 (2003).
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