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Prof Subir Sarkar

Professor Emeritus

Research theme

  • Particle astrophysics & cosmology
  • Fundamental particles and interactions

Sub department

  • Rudolf Peierls Centre for Theoretical Physics

Research groups

  • Particle theory
Subir.Sarkar@physics.ox.ac.uk
Telephone: 01865 (2)73962
Rudolf Peierls Centre for Theoretical Physics, room 60.12
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Brief CV
  • About
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  • IceCube@Oxford
  • Publications

IceCube

Physics World 2013 Breakthrough of the Year
IceCube at Oxford

I am a member since 2004 of the IceCube collaboration which discovered cosmic high energy neutrinos and identified some of their astrophysical sources.

IceCube @ Oxford

Search for astrophysical sources of neutrinos using cascade events in IceCube

Astrophysical Journal American Astronomical Society 846:2 (2017) 1-12

Authors:

M Ackermann, J Adams, Subir Sarkar

Abstract:

The IceCube neutrino observatory has established the existence of a flux of high-energy astrophysical neutrinos, which is inconsistent with the expectation from atmospheric backgrounds at a significance greater than 5σ. This flux has been observed in analyses of both track events from muon neutrino interactions and cascade events from interactions of all neutrino flavors. Searches for astrophysical neutrino sources have focused on track events due to the significantly better angular resolution of track reconstructions. To date, no such sources have been confirmed. Here we present the first search for astrophysical neutrino sources using cascades interacting in IceCube with deposited energies as small as 1 TeV. No significant clustering was observed in a selection of 263 cascades collected from 2010 May to 2012 May. We show that compared to the classic approach using tracks, this statistically independent search offers improved sensitivity to sources in the southern sky, especially if the emission is spatially extended or follows a soft energy spectrum. This enhancement is due to the low background from atmospheric neutrinos forming cascade events and the additional veto of atmospheric neutrinos at declinations ≲-30.
More details from the publisher
Details from ORA
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Details from ArXiV

Axion driven cosmic magneto-genesis during the QCD crossover

(2017)

Authors:

Francesco Miniati, Gianluca Gregori, Brian Reville, Subir Sarkar
More details from the publisher

All-sky search for correlations in the arrival directions of astrophysical neutrino candidates and ultrahigh-energy cosmic rays

35th International Cosmic Ray Conference (ICRC 2017) Proceedings of Science (2017)

Abstract:

High-energy neutrinos, being neutral and weakly interacting particles, are powerful probes of the sites of production and acceleration of cosmic rays. The challenging discovery of cosmic neutrinos by the IceCube Collaboration has moved the field closer to realizing the potential of neutrino astronomy. Meanwhile, ground-based cosmic ray detectors like the Pierre Auger Observatory and the Telescope Array have reached an unprecedented accuracy in the determination of the features of the cosmic rays at the highest energies. We report on a collaborative effort between IceCube, the Pierre Auger Observatory and Telescope Array to identify directional correlations between the arrival directions of the highest-energy cosmic rays from both hemispheres and of the most probable cosmic neutrino events detected by IceCube. We describe the updated results of two independent searches using seven years of IceCube neutrino data and the most energetic cosmicray events detected by the Pierre Auger Observatory and the Telescope Array. The directional correlation found between UHECRs and neutrinos is reported with a significance of ~ 2σ.
Details from ORA
Details from ArXiV

The IceCube Neutrino Observatory - Contributions to ICRC 2017 Part VI: IceCube-Gen2, the next generation neutrino observatory

Proceedings of Science (2017)

Authors:

Aartsen, M Ackermann, J Adams, Subir Sarkar

Abstract:

Contents:

1 IceCube-Gen2: the next-generation neutrino observatory for the South Pole

2 IceAct: Imaging Air Cherenkov Telescopes with SiPMs at the South Pole for IceCube-Gen2

3 Overview and performance of the D-Egg optical sensor for IceCube-Gen2

4 Muon track reconstruction and veto performance with D-Egg sensor for IceCube-Gen2

5 In-ice self-veto techniques for IceCube-Gen2

6 A camera system for IceCube-Gen21

7 The mDOM – A multi-PMT Digital Optical Module for the IceCube-Gen2 neutrino telescope

8 The IceTop Scintillator Upgrade

9 Overview and Performance of the Wavelength-shifting Optical Module (WOM)

10 The Precision Optical CAlibration Module for IceCube-Gen2: First Prototype

Details from ORA
Details from ArXiV

The IceCube Neutrino Observatory: Contributions to ICRC 2017 Part V: Solar flares, supernovae, event reconstruction, education & outreach

Proceedings of Science (2017)

Authors:

Aartsen, M Ackermann, J Adams, Subir Sarkar

Abstract:

Contents:

1 Search for GeV neutrinos associated with solar flares with IceCube

2 Estimating the Sensitivity of IceCube to Signatures of Axion Production in a Galactic Supernova

3 Searching for Arbitrary Low-Energy Neutrino Transients with IceCube

4 Deep Learning in Physics exemplified by the Reconstruction of Muon-Neutrino Events in IceCube

5 Connecting Beyond the Research Community: IceCube Education, Outreach, and Communication Efforts

Details from ORA
Details from ArXiV

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