Luminosity-Independent Measurement of the Proton-Proton Total Cross Section ats=8  TeV

G Antchev,G Ruggiero,P Palazzi,M Quinto,S Minutoli,M Csanád,K Kurvinen,E Robutti,N Turini,E Brücken,E Bossini,J Heino,A Scribano,A Mercadante,M Bozzo,E Radicioni,L Ropelewski,W Snoeys,R Lauhakangas,A Buzzo,T Mäki,J Welti,R Ferretti,P Wyszkowski,J Baechler,H Niewiadomski,K Österberg,S Lami,E Radermacher,M Deile,A Fiergolski,J Kopal,J Whitmore,R A Intonti,M Calicchio,R Orava,F Ferro,P Aspell,J Sziklai,F Nemes,M Berretti,A Santroni,C Taylor,L Grzanka,H Saarikko,E Oliveri,J Procházka,M G Catanesi,T Leszko,I Atanassov,G Latino,M Oriunno,U Bottigli,V Berardi,F Oljemark,F Ravotti,M Lo Vetere,N Minafra,J Smajek,K Eggert,F Cafagna ,É Lippmaa ,M Vítek ,M Macrı́ ,F García ,S Gianì ,T E Hilden ,J Kaˇspar ,Еремин ,Martin Doubek ,Kundrát ,M Lokajivcek ,Avati ,C E Covault ,F Lucas-Rodriguez ,Vacek ,T Csörgõ

doi:10.1103/physrevlett.111.012001

Abstract

The TOTEM collaboration has measured the proton-proton total cross section at √s=8 TeV using a luminosity-independent method. In LHC fills with dedicated beam optics, the Roman pots have been inserted very close to the beam allowing the detection of ~90% of the nuclear elastic scattering events. Simultaneously the inelastic scattering rate has been measured by the T1 and T2 telescopes. By applying the optical theorem, the total proton-proton cross section of (101.7±2.9) mb has been determined, well in agreement with the extrapolation from lower energies. This method also allows one to derive the luminosity-independent elastic and inelastic cross sections: σ(el)=(27.1±1.4) mb; σ(inel)=(74.7±1.7) mb.

Highlights

In Large Hadron Collider (LHC) fills with dedicated beam optics, the Roman pots have been inserted very close to the beam allowing the detection of $90% of the nuclear elastic scattering events
The CERN Large Hadron Collider (LHC) with its energy reach up to 14 TeV and an unprecedented dedicated forward-detector system operated by the TOTEM collaboration provides the unique opportunity to precisely determine tot at various energies and the functional form of the rise with energy
TOTEM collaboration has proton-proton cross section aat lpreffisaffi d1⁄4y measured 7 TeV and the has total demonstrated the reliability of the luminosity-independent method by comparing several approaches to determine the total cross sections [7,8]

Summary

Introduction

Luminosity-Independent Measurement of the Proton-Proton Total Cross Section at pffisffi 1⁄4 8 TeV Collaboration has measured the proton-proton total cross section at pffiffi s using a luminosity-independent method. In LHC fills with dedicated beam optics, the Roman pots have been inserted very close to the beam allowing the detection of $90% of the nuclear elastic scattering events.

Results

Conclusion