Rapidity gap cross sections measured with the ATLAS detector in pp collisions at √s =7 TeV
Abstract
Pseudorapidity gap distributions in proton-proton collisions at √s=7 ~TeV are studied using a minimum bias data sample with an integrated luminosity of 7.1 μb^(−1). Cross sections are measured differentially in terms of Δη^F , the larger of the pseudorapidity regions extending to the limits of the ATLAS sensitivity, at η=±4.9, in which no final state particles are produced above a transverse momentum threshold p_T^(cut). The measurements span the region 0<Δη^F <8 for 200~MeV < p_T^(cut) < 800~MeV. At small Δη^F , the data test the reliability of hadronisation models in describing rapidity and transverse momentum fluctuations in final state particle production. The measurements at larger gap sizes are dominated by contributions from the single diffractive dissociation process (pp → Xp), enhanced by double dissociation (pp → XY) where the invariant mass of the lighter of the two dissociation systems satisfies M_Y ≲7 GeV. The resulting cross section is dσ/dΔη^F ≈1 mb for Δη^F ≳3. The large rapidity gap data are used to constrain the value of the Pomeron intercept appropriate to triple Regge models of soft diffraction. The cross section integrated over all gap sizes is compared with other LHC inelastic cross section measurements.
Additional Information
© 2012 CERN for the benefit of the ATLAS Collaboration. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. Received: 13 January 2012. Revised: 16 February 2012. Published online: 13 March 2012. We are grateful to the HERWIG++ collaboration for their assistance in investigating the low pT rapidity gap spectrum produced by their generator and to M. Ryskin, A. Martin and V. Khoze for supplying their prediction for the behaviour of the inelastic cross section as a function of ξCut. We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions, without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, 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; ARTEMIS and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS andMVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. 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.Attached Files
Published - Aad2012p18015Eur_Phys_J_C.pdf
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Additional details
- Eprint ID
- 31325
- Resolver ID
- CaltechAUTHORS:20120507-094315368
- ANPCyT (Argentina)
- YerPhl (Armenia)
- ARC (Australia)
- BMWF (Austria)
- ANAS (Azerbaijan)
- SSTC (Belarus)
- CNPq and FAPESP (Brazil)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NRC and CFI (Canada)
- CERN
- CONICYT (Chile)
- Chinese Academy of Sciences
- MOST and NSFC (China)
- COLCIENCIAS (Colombia)
- MSMT CR (Czech Republic)
- MPO CR and VSC CR (Czech Republic)
- Danish National Research Foundation
- DNSRC and Lundbeck Foundation (Denmark)
- ARTEMIS and ERC
- European Union
- IN2P3-CNRS (France)
- CEA-DSM/IRFU (France)
- GNAS (Georgia)
- BMBF (Germany)
- Deutsche Forschungsgemeinschaft (DFG)
- Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF)
- Max-Planck-Gesellschaft
- General Secretariat for Research and Technology (GSRT)
- Israeli Science Foundation
- MINERVA (Israel)
- GIF (Israel)
- DIP and Benoziyo Center (Israel)
- Istituto Nazionale di Fisica Nucleare (INFN)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- CNRST (Morocco)
- Stichting voor Fundamenteel Onderzoek der Materie (FOM)
- RCN (Norway)
- MNiSW (Poland)
- GRICES and FCT (Portugal)
- MERYS (MECTS) (Romania)
- MES of Russia and ROSATOM
- Russian Federation
- JINR
- MSTD (Serbia)
- MSSR (Slovakia)
- ARRS and MVZT (Slovenia)
- DST/NRF (South Africa)
- MICINN (Spain)
- SRC and Wallenberg Foundation (Sweden)
- SER (Switzerland)
- SNSF and Cantons of Bern in Geneva (Switzerland)
- National Science Council (Taipei)
- TAEK (Turkey)
- Science and Technology Facilities Council (STFC)
- Royal Society and Leverhulme Trust (United Kingdom)
- Department of Energy (DOE)
- NSF
- Japan Society for the Promotion of Science (JSPS)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
- Alexander von Humboldt Foundation
- Created
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2012-05-07Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field