Volume 101, Number 2, February 2013
|Number of page(s)||7|
|Published online||05 February 2013|
Measurement of proton-proton elastic scattering and total cross-section at
1a Institute of Physics of the Academy of Sciences of the Czech Republic - Praha, Czech Republic, EU
1b Czech Technical University - Praha, Czech Republic, EU
2 National Institute of Chemical Physics and Biophysics NICPB - Tallinn, Estonia, EU
3a Helsinki Institute of Physics - Helsinki, Finland, EU
3b Department of Physics, University of Helsinki - Helsinki, Finland, EU
4 MTA Wigner Research Center, RMKI - Budapest, Hungary, EU
5a INFN Sezione di Bari - Bari, Italy, EU
5b Dipartimento Interateneo di Fisica di Bari - Bari, Italy, EU
6a Sezione INFN di Genova - Genova, Italy, EU
6b Università degli Studi di Genova - Genova, Italy, EU
7a INFN Sezione di Pisa - Pisa, Italy, EU
7b Università degli Studi di Siena and Gruppo Collegato INFN di Siena - Siena, Italy, EU
8 CERN - Geneva, Switzerland
9 Case Western Reserve University, Department of Physics - Cleveland, OH, USA
10 Penn State University, Department of Physics - University Park, PA, USA
Received: 5 December 2012
Accepted: 3 January 2013
At the LHC energy of , under various beam and background conditions, luminosities, and Roman Pot positions, TOTEM has measured the differential cross-section for proton-proton elastic scattering as a function of the four-momentum transfer squared t. The results of the different analyses are in excellent agreement demonstrating no sizeable dependence on the beam conditions. Due to the very close approach of the Roman Pot detectors to the beam center (≈5σbeam) in a dedicated run with β* = 90 m, |t|-values down to 5·10−3 GeV2 were reached. The exponential slope of the differential elastic cross-section in this newly explored |t|-region remained unchanged and thus an exponential fit with only one constant B = (19.9 ± 0.3) GeV−2 over the large |t|-range from 0.005 to 0.2 GeV2 describes the differential distribution well. The high precision of the measurement and the large fit range lead to an error on the slope parameter B which is remarkably small compared to previous experiments. It allows a precise extrapolation over the non-visible cross-section (only 9%) to t = 0. With the luminosity from CMS, the elastic cross-section was determined to be (25.4 ± 1.1) mb, and using in addition the optical theorem, the total pp cross-section was derived to be (98.6 ± 2.2) mb. For model comparisons the t-distributions are tabulated including the large |t|-range of the previous measurement (TOTEM Collaboration (Antchev G. et al), EPL, 95 (2011) 41001).
PACS: 13.60.Hb – Total and inclusive cross sections (including deep-inelastic processes)
© CERN for the benefit of the TOTEM Collaboration
Copyright © EPLA, 2013 Copyright CERN for the benefit of the TOTEM Collaboration. Published by the EPLA under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
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