India in ALICE at CERN - Study of Quark Gluon Plasma - A journey to the beginning of Universe April 27, 2013 IIT - Bombay.

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Presentation transcript:

India in ALICE at CERN - Study of Quark Gluon Plasma - A journey to the beginning of Universe April 27, 2013 IIT - Bombay

Jammu (Jammu Univ.) Chandigarh (Panjab Univ.) Jaipur (Rajasthan Univ.) Aligarh (AMU) Bhubaneswar (IOP) Kolkata (VECC, SINP, Bose Inst.) Mumbai (IIT-B) Guwahati (Univ. of Guwahati) Kolkata: VECC Kolkata: SINP Kolkata: Bose Institute Aligarh: Aligarh Muslim University Bhubaneswar: Institute of Physics Bhubaneswar: NISER Chandigarh: Panjab University Guwahati: University of Guwahati Indore: IIT Jaipur: Rajasthan University Jammu: University of Jammu Mumbai: Indian Institute of Technology, Bombay Mumbai: BARC 85 Members Indian members in ALICE Involvement of Indian Scientists since the beginning of ALICE

A brief history of the Experimental Program Funded by DAE & DST Growing Indian team SPS WA93 and WA – 1996Completed (VECC, IOP, Chandigarh, Jaipur, Jammu) RHIC STAR2000 onwardsData Taking (VECC, IOP, Chandigarh, Jaipur, Jammu, IIT-B) PHENIX1995 onwardsData Taking (BARC and BHU) LHC ALICE1995 onwardsData Taking (VECC, SINP, IOP, AMU, Chandigarh, Jaipur, Jammu, IIT-B, Bose Inst., Guwahati Univ., IIT-Indore, NISER) CMSData Taking (BARC) Contributions: Detector design and fabrication, electronics, ASIC development, mechanics, control, online/offline software, physics

4 An example of large-scale instrumentation Photon Multiplicity Detector (PMD) PMD Probes: Rapidity & Multiplicity distributions of photons Determination of reaction plane and probes of thermalization via study of azimuthal anisotropy Phase Transition: Multiplicity Fluctuations Signal of chiral symmetry restoration (DCC) through the measurement of charged particle and photon multiplicities in a common phase space Goal: Measurement of photon multiplicity and its spatial distribution in the forward region on an event-by-event basis PMD in WA93, WA98, STAR and ALICE: Indigenous - from conception to commissioning

First observation of Collective Flow at CERN SPS Phys. Lett. B403 (1997) 390 Building blocks of PMD Preshower detector: Scintillator pads with wavelength shifting fibres using image intensifier + CCD camera systems readout 8000 pads covering an area of 3m 2 PMD in WA93 Experiment ( )

PMD in WA98 Experiment at CERN (data taking: 1993 – 1996) Rich harvest of physics Observation of collective flow Phys. Lett. B403 (1997) 390. Eur. Phys.J C41 (2005) 287 Scaling of particle production: Phys. Lett. B458 (1999) 422. DCC Search: Phys. Lett. B420 (1998) 169 Phys.Rev.C64 (2001) Phys. Lett. B701 (2011) 300 Fluctuations: Phys. Rev. C, May 2002 WA98 is the first Heavy-ion experiment to study signals of Disoriented Chiral Condensate (DCC)

STAR experiment at RHIC, BNL Photon Multiplicity Detector (PMD)

Limiting Fragmentation behavior (Physical Review Letters 95 (2005)) N γ -N ch correlation (PRC73 (2006)) dN γ /dη (NuclPhys A832 (2010)) 8 Results from STAR-PMD Photon multiplicity and rapidity distributions Correlation of photons with charged particles Limiting fragmentation behaviour Analysis in progress: Flow, DCC and QCD Critical Point

Search for QCD Critical Point LHC RHIC Higher Moments of Conserved Quantities (in Collaboration with Lattice Theory Group, TIFR) Two STAR PRLs at top RHIC energies: PRL 105 (2010) PRL 103 (2009) New analysis in progress RHIC Beam Energy Scan Program

PMD photons PMD photons MUON arm  -pairs MUON arm  -pairs India in ALICE

PMD: Photon Multiplicity Detector Measurement of photon multiplicity and spatial distribution of photons in the forward region on an event-by-event basis Fully Indian effort: from conception to commissioning (Design, Fabrication, Installation, Detector Control and Data Acquisition) Total no of honeycomb cells = Cell depth = 0.5 cm Cell Cross section = 0.23 cm 2 1 module = 4608 cells read 1 module read by 72 FEE boards 1 FEE board = 64 cells (4 MANAS Chips). Each MANAS reads 16 channels Sensitive medium : Gas (Ar+CO 2 in the ratio 70:30) Total no of Modules = 48

Muon Tracking Chambers l 5 stations of two Cathode Pad Chambers ~ 100 m 2 l 1.1  10 6 channels, occupancy < 5% (in Pb+Pb)  Read out at 1 kHz l Chamber thickness ~ 3% X0 l Beam test results for the spatial resolution : 50  m for a required resolution < 100  m Collaboration France, India, Italy, Russia: Manu MANAS electronic chip: 16-channel Amplifier, shaper, track-and-hold - Reads 1.1 million pads of tracking chambers of ALICE

ALICE Future Upgrade: Forward Calorimeter in ALICE 25 Layers Silicon layers 22 layers of 1cm x 1cm silicon pads (500 K channels) 3 layers of 1mmx1mm silicon pads (3 Million channels) Tungsten – Silicon Calorimeter Physics: -Initial State: Low-x Gluon Saturation -Initial State: Nuclear PDFs -Probing the strongly interacting matter thru jet quenching, flow and correlations. Collaboration with BEL and BARC Needs High Resolution Silicon Sensors

detector FEE Boards PMT1 PMT 2 Source- Sr90 Very thin scintillator to get 2 fold triggers PMT1 PMT2 PMT3 Translator board FEE board Backplane PCB DUT Silicon pad detector array Tests at VECC Tests with ANU FEE Tests with MANAS FEE

Results from the Testbeam pion electron

Sanjib MuhuriVECC Design of Forward EM Calorimeter Study of gamma-tagged jets Sudipan DeVECC Photon Multiplicity Long range correlations Subhash SinghaNISER (VECC) K* resonance Photon Multiplicity Sumit BasuVECCIndentified particle spectra and Temperature fluctuations Maitreyee Mukherjee VECCMultiplicity and charged-neutral fluctuations using FMD and PMD Subikash Choudhury VECCDihadron correlations Debojit SarkarVECCDihadron correlations Somnath KarVECCD(0)-hadron correlations Research Scholars in ALICE Experiment 19/12/11 Task Force Meeting 17

Satyajit JenaIIT-B Net-charge fluctuations Photon Multiplicity Anitha NyathaIIT-B Azimuthal Asymmetry of photons, analysis in advanced stage GreeshmaIIT-B Tagged di-hadron correlations Nirbhay Behera IIT-B Higher moments of conserved quantities such as net-charge and net-proton Jitendra Kumar IIT-B D+ hadron correlations Divyash Pant IIT-B Photon Flow Nileema IIT-B 19/12/11 Task Force Meeting 18

Rama Chandra Baral IOP Lambda resonance spectra and flow Srikant TripathyIOP Palas KhanSINP Upsilon studies Biswarup PaulSINP J/Y(1S) and J/Y(2S) studies Aditya MishraIIT – IndorePhoton – charge fluctuation Rakesh MajumdarIIT – IndorepT fluctuations for identified particles Puja ParikhIIT - Indore 19/12/11 Task Force Meeting 19

Deepika RatheePanjab U. Fluctuation of particle ratios Ranbir SinghJammu U. Azimuthal asymmetry of photons and charged particles Rohni SharmaJammu U Particle fluctuations Sonia RajputJammu U. D * - hadron correlation Ankita SharmaJammu U. D+ - hadron correlation 19/12/11 Task Force Meeting 20