Luminosity-independent measurements of total, elastic and inelastic cross-sections at

By G. Antchev, M. Berretti, M. Bozzo, P. Brogi, E. Robutti, J. Smajek, E. Radicioni, I. Atanassov, R. Ferretti, K. Eggert and 68 more. 2013

185 citations recorded by the source corpus.

The TOTEM experiment at the LHC has performed the first luminosity-independent determination of the total proton-proton cross-section at . This technique is based on the optical theorem and requires simultaneous measurements of the inelastic rate – accomplished with the forward charged-particle telescopes T1 and T2 in the range 3.1 < |η| < 6.5 – and of the elastic rate by detecting the outcoming protons with Roman Pot detectors. The data presented here were collected in a dedicated run in 2011 with special beam optics (β* = 90 m) and Roman Pots approaching the beam close enough to register elastic events with squared four-momentum transfers |t| as low as 5·10−3 GeV2. The luminosity-independent results for the elastic, inelastic and total cross-sections are σel = (25.1 ± 1.1) mb, σinel = (72.9 ± 1.5) mb and σtot = (98.0 ± 2.5) mb, respectively. At the same time this method yields the integrated luminosity, in agreement with measurements by CMS. TOTEM has also determined the total cross-section in two complementary ways, both using the CMS luminosity measurement as an input. The first method sums the elastic and inelastic cross-sections and thus does not depend on the ρ parameter. The second applies the optical theorem to the elastic-scattering measurements only and therefore is free of the T1 and T2 measurement uncertainties. The methods, having very different systematic dependences, give results in excellent agreement. Moreover, the ρ-independent measurement makes a first estimate for the ρ parameter at possible: |ρ| = 0.145 ± 0.091.

Subfields: Electrical and Electronic Engineering, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0b118c0837fad37277461531b1854e81eb2d728a

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In Electrical and Electronic Engineering

1. G. Lanfranchi
2. T. Blake
3. P. Robbe
4. Marco Dorigo
5. C. Jones
6. T. Shears
7. Atlas Collaboration
8. Gloria Corti

In Nuclear and High Energy Physics

1. D. d’Enterria
2. J. Kamin
3. C. Loizides
4. Atlas Collaboration
5. S. Farry
6. G. Lanfranchi
7. U. Egede
8. N. Serra

Citations in the corpus

• Improved Monte Carlo Glauber predictions at present and future nuclear colliders (2017, methodology): “[42] TOTEM Collaboration, G.”
• Precision luminosity measurements at LHCb (2014, methodology): “A comparison is made with the luminosity-independent measurements of the pp inelastic cross-section by the TOTEM collaboration [8, 52] at 7 and 8 TeV, and direct measurements by the ALICE [53] and the ATLAS [54] experiments.”
• Measurement of the Inelastic Proton-Proton Cross Section at root s=13 TeV with the ATLAS Detector at the LHC (2016, methodology): “Measurements from other hadron collider experiments [6, 7, 9, 14, 15] and the Pierre Auger experiment [16] are also shown.”
• When does the gluon reggeize? (2013, methodology): “To expand at large Nc one can use the following standard SU(Nc) identities, with traces normalized so that Tr[1] = Nc, Tr[T aT b] = 12δ ab:”