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Title: Measurement of the total cross section from elastic scattering in pp collisions at √s=7 TeV with the ATLAS detector

In this study, a measurement of the total $pp$ cross section at the LHC at $$\sqrt{s}=7$$ TeV is presented. In a special run with high-$$\beta^{\star}$$ beam optics, an integrated luminosity of 80 µb-1 was accumulated in order to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable $t$. The measurement is performed with the ALFA sub-detector of ATLAS. Using a fit to the differential elastic cross section in the |t| range from 0.01 GeV2 to 0.1 GeV2 to extrapolate to |t| → 0, the total cross section, σtot($pp$ → X), is measured via the optical theorem to be: σtot($pp$ → X) = 95.35 ± 0.38 (stat.) ± 1.25 (exp.) ± 0.37 (extr.) mb, where the first error is statistical, the second accounts for all experimental systematic uncertainties and the last is related to uncertainties in the extrapolation to |t| → 0. In addition, the slope of the elastic cross section at small |t| is determined to be B = 19.73 ± 0.14 (stat.) ± 0.26 (syst.) GeV-2.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Aix-Marseille Univ. and CNRS/IN2P3, Marseille (France)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Academia Sinica, Taipei (Taiwan)
  4. Univ. Paris-Sud and CNRS/IN2P3, Orsay (France). et al.
Publication Date:
OSTI Identifier:
1197897
Report Number(s):
BNL-107573-2015-JA
Journal ID: ISSN 0550-3213; PII: S0550321314003253; TRN: US1600725
Grant/Contract Number:
SC00112704; AC02-06CH11357; AC02-05CH11231; AC03-76SF00515
Type:
Published Article
Journal Name:
Nuclear Physics. B
Additional Journal Information:
Journal Volume: 889; Journal Issue: C; Journal ID: ISSN 0550-3213
Publisher:
Elsevier
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
ATLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS