Observation of Long-Range Elliptic Azimuthal Anisotropies in √s p ¼ 13 and 2.76 TeV pp Collisions with the ATLAS Detector

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dc.contributor.author Amelung, Christoph
dc.contributor.author Amundsen, Glenn
dc.contributor.author Artoni, Giacomo
dc.contributor.author Barone, Gaetano
dc.contributor.author Bensinger, James R.
dc.contributor.author Bianchini, Louis
dc.contributor.author Blocker, Craig
dc.contributor.author Coffey, Laurel
dc.contributor.author Dhaliwal, Saminder
dc.contributor.author Loew, Kevin
dc.contributor.author Sciolla, Gabriella
dc.contributor.author Venturini, Alessio
dc.contributor.author Zengel, Keith
dc.date.accessioned 2017-12-05T19:44:15Z
dc.date.available 2017-12-05T19:44:15Z
dc.date.issued 16-04-27
dc.identifier.citation ATLAS Collaboration Physical Review Letters 116, 172301 (2016)
dc.identifier.issn 0031-9007
dc.identifier.issn 1079-7114
dc.identifier.uri http://hdl.handle.net/10192/35032
dc.description Published version can be found on Physical Review Letters' site: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.172301
dc.description.abstract ATLAS has measured two-particle correlations as a function of the relative azimuthal angle, Δϕ, and pseudorapidity, Δη, in √s=13 and 2.76 TeV pp collisions at the LHC using charged particles measured in the pseudorapidity interval |η|<2.5. The correlation functions evaluated in different intervals of measured charged-particle multiplicity show a multiplicity-dependent enhancement at Δϕ∼0 that extends over a wide range of Δη, which has been referred to as the “ridge.” Per-trigger-particle yields, Y(Δϕ), are measured over 2<|Δη|<5. For both collision energies, the Y(Δϕ)distribution in all multiplicity intervals is found to be consistent with a linear combination of the per-trigger-particle yields measured in collisions with less than 20 reconstructed tracks, and a constant combinatoric contribution modulated by cos(2Δϕ). The fitted Fourier coefficient, v2,2, exhibits factorization, suggesting that the ridge results from per-event cos(2ϕ) modulation of the single-particle distribution with Fourier coefficients v2. The v2 values are presented as a function of multiplicity and transverse momentum. They are found to be approximately constant as a function of multiplicity and to have a pT dependence similar to that measured in p+Pb and Pb+Pb collisions. The v2 values in the 13 and 2.76 TeV data are consistent within uncertainties. These results suggest that the ridge in pp collisions arises from the same or similar underlying physics as observed in p+Pbcollisions, and that the dynamics responsible for the ridge has no strong √s dependence.
dc.description.sponsorship Supported by ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, the Canada Council, CANARIE, CRC, Compute Canada, FQRNT, and the Ontario Innovation Trust, Canada; EPLANET, ERC, FP7, Horizon 2020 and Marie Skłodowska-Curie Actions, European Union; Investissements d’Avenir Labex and Idex, ANR, Region Auvergne and Fondation Partager le Savoir, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF; BSF, GIF and Minerva, Israel; BRF, Norway; the Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.
dc.language English
dc.language.iso eng
dc.publisher American Physical Society
dc.rights Copyright by CERN 2016
dc.subject Collective flow
dc.subject Particle & resonance production
dc.subject Relativistic heavy-ion collisions
dc.title Observation of Long-Range Elliptic Azimuthal Anisotropies in √s p ¼ 13 and 2.76 TeV pp Collisions with the ATLAS Detector
dc.type Article
dc.contributor.department Department of Physics
dc.identifier.doi https://doi.org/10.1103/PhysRevLett.116.172301
dc.description.esploro yes


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