Publications de Shirit Cohen | EPFL Graph Search

Investigation of the fine structure of antihydrogen

At the historic Shelter Island Conference on the Foundations of Quantum Mechanics in 1947, Willis Lamb reported an unexpected feature in the fine structure of atomic hydrogen: a separation of the 2S(1/2) and 2P(1/2) states(1). The observation of this separ ...

2020

Observation of the 1S-2P Lyman-alpha transition in antihydrogen

Shirit Cohen

In 1906, Theodore Lyman discovered his eponymous series of transitions in the extreme-ultraviolet region of the atomic hydrogen spectrum(1,2). The patterns in the hydrogen spectrum helped to establish the emerging theory of quantum mechanics, which we now ...

Nature Publishing Group2018

Antihydrogen accumulation for fundamental symmetry tests

Shirit Cohen

Antihydrogen, a positron bound to an antiproton, is the simplest anti-atom. Its structure and properties are expected to mirror those of the hydrogen atom. Prospects for precision comparisons of the two, as tests of fundamental symmetries, are driving a vi ...

Springer Nature2017

The IceProd framework: Distributed data processing for the IceCube neutrino observatory

Shirit Cohen, Mathieu Ribordy, Matthias Wolf, Mark Tobin, Sofia Vallecorsa, Xiaoxia Bai

IceCube is a one-gigaton instrument located at the geographic South Pole, designed to detect cosmic neutrinos, identify the particle nature of dark matter, and study high-energy neutrinos themselves. Simulation of the IceCube detector and processing of dat ...

Academic Press Inc Elsevier Science2015

Search for neutrino-induced particle showers with IceCube-40

Shirit Cohen, Mathieu Ribordy, Matthias Wolf, Mark Tobin, Sofia Vallecorsa, Xiaoxia Bai

We report on the search for neutrino-induced particle showers, so-called cascades, in the IceCube-40 detector. The data for this search were collected between April 2008 and May 2009 when the first 40 IceCube strings were deployed and operational. Three co ...

American Physical Society2014

IceCube sensitivity for low-energy neutrinos from nearby supernovae (vol 535, pg A109, 2011)

Shirit Cohen, Mathieu Ribordy, Matthias Wolf, Xiaoxia Bai

Edp Sciences S A2014

Energy reconstruction methods in the IceCube neutrino telescope

Shirit Cohen, Mathieu Ribordy, Matthias Wolf, Mark Tobin, Sofia Vallecorsa, Xiaoxia Bai

Accurate measurement of neutrino energies is essential to many of the scientific goals of large-volume neutrino telescopes. The fundamental observable in such detectors is the Cherenkov light produced by the transit through a medium of charged particles cr ...

Iop Publishing Ltd2014

Observation of the cosmic-ray shadow of the Moon with IceCube

Shirit Cohen, Mathieu Ribordy, Matthias Wolf, Xiaoxia Bai

We report on the observation of a significant deficit of cosmic rays from the direction of the Moon with the IceCube detector. The study of this "Moon shadow" is used to characterize the angular resolution and absolute pointing capabilities of the detector ...

American Physical Society2014

Search for non-relativistic magnetic monopoles with IceCube

Shirit Cohen, Mathieu Ribordy, Matthias Wolf, Mark Tobin, Sofia Vallecorsa, Xiaoxia Bai

The IceCube Neutrino Observatory is a large Cherenkov detector instrumenting of Antarctic ice. The detector can be used to search for signatures of particle physics beyond the Standard Model. Here, we describe the search for non-relativistic, magnetic mono ...

Springer2014

Improvement in fast particle track reconstruction with robust statistics

Shirit Cohen, Mathieu Ribordy, Matthias Wolf, Sofia Vallecorsa, Xiaoxia Bai

The IceCube project has transformed 1 km(3) of deep natural Antarctic ice into a Cherenkov detector Muon neutrinos are detected and their direction is inferred by mapping the light produced by the secondary muon track inside the volume instrumented with ph ...

Elsevier2014