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Mumbai, India

Bhalerao R.S.,TIFR | Luzum M.,CEA Saclay Nuclear Research Center | Ollitrault J.-Y.,CEA Saclay Nuclear Research Center
Journal of Physics G: Nuclear and Particle Physics

Event-by-event fluctuations of the initial transverse density profile result in a collective flow pattern which also fluctuates event by event. We propose a number of new correlation observables to characterize these fluctuations and discuss how they should be analyzed experimentally. We argue that most of these quantities can be measured at the RHIC and the LHC, and compare prediction with recent data. © 2011 IOP Publishing Ltd. Source

Bhalerao R.S.,TIFR | Luzum M.,CEA Saclay Nuclear Research Center | Ollitrault J.-Y.,French National Center for Scientific Research
Physical Review C - Nuclear Physics

We present a number of independent flow observables that can be measured using multiparticle azimuthal correlations in heavy-ion collisions. Some of these observables are already well known, such as v2{2} and v 2{4}, but most are new-in particular, joint correlations among v 1, v2, and v3. Taken together, these measurements will allow for a more precise determination of the medium properties than is currently possible. In particular, by taking ratios of these observables, we construct quantities that are less sensitive to the hydrodynamic response of the medium and thus more directly characterize the initial-state fluctuations of the event shape, which may constrain models for early-time, nonequilibrium QCD dynamics. We present predictions for these ratios using two Monte Carlo models and compare them to available data. © 2011 American Physical Society. Source

Ghosh S.S.,TIFR
Nuclear and Particle Physics Proceedings

The performance of missing transverse momentum reconstruction algorithms is presented using 8 TeV pp collision data collected with the CMS detector, corresponding to an integrated luminosity of 12.2 ± 0.5 fb-1. The scale and resolution of missing transverse momentum and the effects of multiple proton-proton interactions (pileup), are measured using events with an identified Z boson or isolated photon. They are in general well described by the simulation. Advanced missing transverse momentum reconstruction algorithms are also developed specifically to mitigate the effects of large numbers of pileup interactions on missing transverse momentum resolution. Using these advanced algorithms, the dependence of the missing transverse momentum resolution on pileup interactions is reduced significantly. © 2015 Elsevier B.V. Source

Measurements of the muon charge asymmetry in inclusive pp→WX production at √s=7 TeV are presented. The data sample corresponds to an integrated luminosity of 4.7 fb-1 recorded with the CMS detector at the LHC. With a sample of more than twenty million W→μν events, the statistical precision is greatly improved in comparison to previous measurements. These new results provide additional constraints on the parton distribution functions of the proton in the range of the Bjorken scaling variable x from 10-3 to 10-1. These measurements are used together with the cross sections for inclusive deep inelastic ep scattering at HERA in a next-to-leading-order QCD analysis. © 2015 Elsevier B.V. Source

Dewanjee R.K.,TIFR
Springer Proceedings in Physics

With the recent discovery of the SM (Standard Model) higgs boson of mass around 125 GeV by the CMS (Compact Muon Solenoid) and the ATLAS (A Toroidal LHC Apparatus) collaborations at the LHC (Large Hadron Collider) at CERN, there have been attempts to interpret this newly discovered resonance in the context of BSM (Beyond Standard Model) physics scenarios. Results are presented for the search for Neutral MSSM (Mininal SuperSymmetric Standard Model) higgs bosons where the higgs decays to two τ -leptons using the full Run-1 dataset (4.9 fb−1 at 7TeV and 19.7 (18.3) fb−1 at 8 TeV for eτh/μτh/eμ/μμ (τhτh) channels. No 7TeV data for τhτh due to lack of triggers.) collected by the CMS experiment. Interpretation of these results in the context of the SM higgs boson discovery is also given. © Springer International Publishing Switzerland 2016. Source

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