543 Result(s)

Article

Study of charmonia in four-meson final states produced in two-photon collisions

We report measurements of charmonia produced in two-photon collisions and decaying to four-meson final states, where the meson is either a charged pion or a charged kaon. The analysis is based on a 395 fb^-1 data ...

S. Uehara, I. Adachi, H. Aihara, V. Aulchenko, T. Aushev… in The European Physical Journal C (2008)

Article

The CMS barrel calorimeter response to particle beams from 2 to 350 GeV/c

The response of the CMS barrel calorimeter (electromagnetic plus hadronic) to hadrons, electrons and muons over a wide momentum range from 2 to 350 GeV/c has been measured. To our knowledge, this is the widest ra...

S. Abdullin, V. Abramov, B. Acharya, N. Adam, M. Adams… in The European Physical Journal C (2009)

Article

The CMS barrel calorimeter response to particle beams from 2 to 350 GeV/c

S. Abdullin, V. Abramov, B. Acharya, N. Adam, M. Adams… in The European Physical Journal C (2009)

Article

CMS tracking performance results from early LHC operation

The first LHC pp collisions at centre-of-mass energies of 0.9 and 2.36 TeV were recorded by the CMS detector in December 2009. The trajectories of charged particles produced in the collisions were reconstructe...

V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam… in The European Physical Journal C (2010)

Article

First measurement of the underlying event activity at the LHC with  \(\sqrt{s} = 0.9\)  TeV

A measurement of the underlying activity in scattering processes with p _T scale in the GeV region is performed in proton–proton collisions at ...

V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam… in The European Physical Journal C (2010)

Article

The ATLAS Simulation Infrastructure

The simulation software for the ATLAS Experiment at the Large Hadron Collider is being used for large-scale production of events on the LHC Computing Grid. This simulation requires many components, from the ge...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2010)

Article

The ATLAS Inner Detector commissioning and calibration

The ATLAS Inner Detector is a composite tracking system consisting of silicon pixels, silicon strips and straw tubes in a 2 T magnetic field. Its installation was completed in August 2008 and the detector took...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2010)

Article

Readiness of the ATLAS liquid argon calorimeter for LHC collisions

The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been co...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2010)

Article

Readiness of the ATLAS Tile Calorimeter for LHC collisions

The Tile hadronic calorimeter of the ATLAS detector has undergone extensive testing in the experimental hall since its installation in late 2005. The readout, control and calibration systems have been fully op...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2010)

Article

Drift Time Measurement in the ATLAS Liquid Argon Electromagnetic Calorimeter using Cosmic Muons

The ionization signals in the liquid argon of the ATLAS electromagnetic calorimeter are studied in detail using cosmic muons. In particular, the drift time of the ionization electrons is measured and used to a...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2010)

Article

Commissioning of the ATLAS Muon Spectrometer with cosmic rays

The ATLAS detector at the Large Hadron Collider has collected several hundred million cosmic ray events during 2008 and 2009. These data were used to commission the Muon Spectrometer and to study the performan...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2010)

Article

Measurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector

Jet cross sections have been measured for the first time in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector. The measurement uses an integrated luminosity of 17 nb⁻¹ recorded...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2011)

Article

Prompt and non-prompt J/ψ production in pp collisions at \(\sqrt{s} = 7\) TeV

The production of J/ψ mesons is studied in pp collisions at \(\sqrt{s} = 7\)  TeV with the CMS experiment at the LHC. The measurem...

V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam… in The European Physical Journal C (2011)

Article

Studies of the performance of the ATLAS detector using cosmic-ray muons

Muons from cosmic-ray interactions in the atmosphere provide a high-statistics source of particles that can be used to study the performance and calibration of the ATLAS detector. Cosmic-ray muons can penetrat...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2011)

Article

Luminosity determination in pp collisions at \(\sqrt{s} = 7\) TeV using the ATLAS detector at the LHC

Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at \(\sqrt{s} = 7\) ...

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2011)

Article

Measurements of underlying-event properties using neutral and charged particles in pp collisions at \(\sqrt{s}=900\) GeV and \(\sqrt{s}=7\) TeV with the ATLAS detector at the LHC

We present first measurements of charged and neutral particle-flow correlations in pp collisions using the ATLAS calorimeters. Data were collected in 2009 and 2010 at centre-of-mass energies of 900 GeV and 7 TeV....

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2011)

Article

Test of the τ-model of Bose–Einstein correlations and reconstruction of the source function in hadronic Z-boson decay at LEP

Bose–Einstein correlations of pairs of identical charged pions produced in hadronic Z decays are analyzed in terms of various parametrizations. A good description is achieved using a Lévy stable distribution i...

P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz… in The European Physical Journal C (2011)

Article

Search for supersymmetric particles in events with lepton pairs and large missing transverse momentum in \(\sqrt{s}=7~\mbox{TeV}\) proton–proton collisions with the ATLAS experiment

Results are presented of searches for the production of supersymmetric particles decaying into final states with missing transverse momentum and exactly two isolated leptons in

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2011)

Article

Search for an excess of events with an identical flavour lepton pair and significant missing transverse momentum in \(\sqrt{s}=7\) TeV proton–proton collisions with the ATLAS detector

Results are presented of a search for particles decaying into final states with significant missing transverse momentum and exactly two identical flavour leptons (e, μ) of opposite charge in

G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim… in The European Physical Journal C (2011)

Article

Measurement of the \(\mathrm{{t\bar{t}}}\) production cross section in pp collisions at \(\sqrt{s}=7\) TeV using the kinematic properties of events with leptons and jets

A measurement of the \(\mathrm{t{\bar{t}}}\) production cross section in proton-proton collisions at a centre-of-mass energy of 7...

S. Chatrchyan, V. Khachatryan, A. M. Sirunyan… in The European Physical Journal C (2011)