• A P Singh

      Articles written in Pramana – Journal of Physics

    • Beam-induced radiation in the compact muon solenoid tracker at the Large Hadron Collider

      A P Singh P C Bhat N V Mokhov S Beri

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      The intense radiation environment at the Large Hadron Collider, CERN at a design energy of $\sqrt{s} = 14$ TeV and a luminosity of 1034 cm−2S−1 poses unprecedented challenges for safe operation and performance quality of the silicon tracker detectors in the CMS and ATLAS experiments. The silicon trackers are crucial for the physics at the LHC experiments, and the inner layers, being situated only a few centimeters from the interaction point, are most vulnerable to beam-induced radiation. We have recently carried out extensive Monte Carlo simulation studies using MARS program to estimate particle fluxes and radiation dose in the CMS silicon pixel and strip trackers from proton–proton collisions at $\sqrt{s} = 14$ TeV and from machine-induced background such as beam–gas interactions and beam halo. We will present results on radiation dose, particle fluxes and spectra from these studies and discuss implications for radiation damage and performance of the CMS silicon tracker detectors.

    • $W/Z +$jet(s) production in pp collisions at $\sqrt{s} = 7$ TeV

      S B Beri L K Saini A P Singh on behalf of the CMS Collaboration

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      The measurements of the cross-sections are presented for the production of jets in association with 𝑊 and 𝑍 bosons reconstructed in their decays to electrons and muons. The results are based on 36 pb-1 of $pp$ collisions at $\sqrt{s} = 7$ TeV collected by the CMS Collaboration. Jets are reconstructed with the CMS particle flow algorithm and must pass a transverse momentum threshold of 30 GeV. The study presents the ratios $\sigma (V + \geq n-{\text{jet}})/\sigma (V)$ and $\sigma (V + \geq n-{\text{jet}})/\sigma(V + \geq (n - 1)-{\text{jet}}).$ The comparison between the data and the Monte Carlo prediction is also showed.

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