Viser treff 1-20 av 112

• #### ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at √s=13 TeV ﻿

(Peer reviewed; Journal article, 2019)
The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency ...
• #### Centrality dependence of charged jet production in p-Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV ﻿

(Peer reviewed; Journal article, 2016-05)
Measurements of charged jet production as a function of centrality are presented for p-Pb collisions recorded at $\sqrt{s_{\rm NN}} = 5.02$ TeV with the ALICE detector. Centrality classes are determined via the energy ...
• #### Charged-particle multiplicity distributions over a wide pseudorapidity range in proton-proton collisions at √s = 0.9, 7, and 8 TeV ﻿

(Peer reviewed; Journal article, 2017-12-09)
We present the charged-particle multiplicity distributions over a wide pseudorapidity range (−3.4<η<5.0 ) for pp collisions at √s=0.9,7 , and 8 TeV at the LHC. Results are based on information from the Silicon Pixel Detector ...
• #### Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at √s=5.02and 13 TeV ﻿

(Peer reviewed; Journal article, 2019-10-17)
We present a study of the inclusive chargedparticle transverse momentum (pT) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, dNch/dη, in pp collisions at √s = 5.02 and 13 TeV covering ...
• #### Charged-particle pseudorapidity density at mid-rapidity in p–Pb collisions at √sNN = 8.16 TeV ﻿

(Peer reviewed; Journal article, 2019-04-04)
The pseudorapidity density of charged particles, dNch/dη , in p–Pb collisions has been measured at a centre-of-mass energy per nucleon–nucleon pair of sNN−−−√ = 8.16 TeV at mid-pseudorapidity for non-single-diffractive ...
• #### Charged–particle multiplicities in proton–proton collisions at $\sqrt{s}=$ 0.9 to 8 TeV, with ALICE at the LHC ﻿

(Peer reviewed; Journal article, 2017-01)
The ALICE Collaboration has carried out a detailed study of pseudorapidity densities and multiplicity distributions of primary charged particles produced in proton-proton collisions, at $\sqrt{s} =$ 0.9, 2.36, 2.76, 7 ...
• #### Charmonium and $e^+e^-$ pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV ﻿

(Peer reviewed; Journal article, 2013-11)
The ALICE Collaboration at the LHC has measured the $J/\psi$ and $\psi$' photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The charmonium is identified via its leptonic ...
• #### Direct top-quark decay width measurement in the tt¯lepton+jets channel at √s=8 TeV with the ATLAS experiment ﻿

(Peer reviewed; Journal article, 2018-02-15)
This paper presents a direct measurement of the decay width of the top quark using tt¯ events in the lepton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at a ...
• #### Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data ﻿

(Peer reviewed; Journal article, 2014-10-01)
This paper presents the electron and photon energy calibration achieved with the ATLAS detector using about 25 fb −1 of LHC proton–proton collision data taken at centre-of-mass energies of s√=7 and 8 TeV. The reconstruction ...
• #### Energy dependence of exclusive J/ψ photoproduction off protons in ultra-peripheral p–Pb collisions at √sNN = 5.02 TeV ﻿

(Peer reviewed; Journal article, 2019)
The ALICE Collaboration has measured the energy dependence of exclusive photoproduction of J/ψ vector mesons off proton targets in ultra–peripheral p–Pb collisions at a centre-of-mass energy per nucleon pair sNN=√5.02 TeV. ...
• #### Energy dependence of forward-rapidity J/$psi$ and $\psi(2S)$ production in pp collisions at the LHC ﻿

(Peer reviewed; Journal article, 2017-06)
We present ALICE results on transverse momentum $p_{\rm T}$ and rapidity $y$ differential production cross sections, mean transverse momentum and mean transverse momentum square of inclusive J/\).psi\) and $\psi(2S)$ ...
• #### Energy dependence of the transverse momentum distributions of charged particles in pp collisions measured by ALICE ﻿

(Peer reviewed; Journal article, 2013-12)
Differential cross sections of charged particles in inelastic pp collisions as a function of $p_T$ have been measured at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV at the LHC. The $p_T$ spectra are compared to NLO-pQCD ...
• #### Event-by-event mean pT fluctuations in pp and Pb–Pb collisions at the LHC ﻿

(Peer reviewed; Journal article, 2014-10)
Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at s√ = 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at √sNN = 2.76 TeV are studied as a function of the charged-particle ...
• #### Higher-order corrections to heavy-quark jet quenching ﻿

(Peer reviewed; Journal article, 2019-07-03)
We calculate higher-order corrections to the quenching factor of heavy-quark jets due to hard, in-medium splittings in the framework of the BDMPS-Z formalism. These corrections turn out to be sensitive to a single mass ...
• #### Identification of boosted Higgs bosons decaying into b-quark pairs with the ATLAS detector at 13 TeV ﻿

(Peer reviewed; Journal article, 2019)
This paper describes a study of techniques for identifying Higgs bosons at high transverse momenta decaying into bottom-quark pairs, H→bb¯, for proton–proton collision data collected by the ATLAS detector at the Large ...
• #### In situ calibration of large-radius jet energy and mass in 13 TeV proton–proton collisions with the ATLAS detector ﻿

(Peer reviewed; Journal article, 2019-02-13)
The response of the ATLAS detector to largeradius jets is measured in situ using 36.2 fb−1 of √s = 13 TeV proton–proton collisions provided by the LHC and recorded by the ATLAS experiment during 2015 and 2016. The jet ...
• #### Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at $\sqrt{s}=7$ TeV ﻿

(Peer reviewed; Journal article, 2017-08)
Two-particle angular correlations were measured in pp collisions at $\sqrt{s} = 7$ TeV for pions, kaons, protons, and lambdas, for all particle/anti-particle combinations in the pair. Data for mesons exhibit an expected ...
• #### Light-quark and gluon jet discrimination in pp collisions at √s = 7 TeV with the ATLAS detector ﻿

(Peer reviewed; Journal article, 2014-08-21)
A likelihood-based discriminant for the identification of quark- and gluon-initiated jets is built and validated using 4.7 fb−1 of proton–proton collision data at √s = 7 TeV collected with the ATLAS detector at the LHC. ...
• #### Measurement of azimuthal correlations of D mesons and charged particles in pp collisions at $\sqrt{s}=7$ TeV and p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV ﻿

(Peer reviewed; Journal article, 2017-04)
The azimuthal correlations of D mesons and charged particles were measured with the ALICE detector in pp collisions at $\sqrt{s}=7$ TeV and p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV at the Large Hadron Collider. ...
• #### Measurement of colour flow using jet-pull observables in tt¯events with the ATLAS experiment at √s=13 TeV ﻿

(Peer reviewed; Journal article, 2018-10)
Previous studies have shown that weighted angular moments derived from jet constituents encode the colour connections between partons that seed the jets. This paper presents measurements of two such distributions, the ...