Measurement of proton-proton elastic scattering and total cross-section at \chem{\sqrt {s} = 7\,TeV}

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

doi:10.1209/0295-5075/101/21002

Cited by 211 publications

(184 citation statements)

References 26 publications

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“…The comparison with TOTEM results (Ref. [11]) shows an agreement at the 1.3 (1.1) σ level for the total (elastic) cross sections respectively. …”

Section: Cross Sections With Proton Tagsupporting

confidence: 71%

Results and Perspectives in Forward Physics with ATLAS

Giacobbe

2016

Nuclear and Particle Physics Proceedings

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A review of the ATLAS forward physics results is given with particular emphasis on the aspects of relevance for the cosmic rays community. These include proton-proton cross section measurements at √ s = 7 TeV, diffractive physics studies using rapidity gaps, measurements of energy flow as a function of pseudorapidity, and the first cross section measurement performed in the recently started Run 2 at √ s = 13 TeV. The ATLAS future perspectives will also be discussed, focused on the phase 1 upgrade project AFP, underlying its potential for a wide forward physics program both at low and high luminosity.

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“…The comparison with TOTEM results (Ref. [11]) shows an agreement at the 1.3 (1.1) σ level for the total (elastic) cross sections respectively. …”

Section: Cross Sections With Proton Tagsupporting

confidence: 71%

Results and Perspectives in Forward Physics with ATLAS

Giacobbe

2016

Nuclear and Particle Physics Proceedings

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“…This will then be transferred through the photon propagators as well, so that we no longer have the exact relation p i ⊥ = −q i ⊥ between the photon and outgoing proton transverse momenta. Nonetheless, the average momentum transfer is small, with k 2 ⊥ ∼ 2/B el , where the t-slope for elastic pp scattering B el ∼ 20 GeV −2 at the LHC [52,53], and so k 2 ⊥ ∼ 0.1 GeV. Thus, after integrating over k ⊥ , the exact cos 2 (φ) or sin 2 (φ) distributions are washed out somewhat, but the dominant behaviour remains.…”

Section: Spin-parity Analysismentioning

confidence: 99%

The production of a diphoton resonance via photon-photon fusion

Harland–Lang

Khoze

Ryskin

2016

J. High Energ. Phys.

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Motivated by the recent LHC observation of an excess of diphoton events around an invariant mass of 750 GeV, we discuss the possibility that this is due to the decay of a new scalar or pseudoscalar resonance dominantly produced via photon-photon fusion. We present a precise calculation of the corresponding photon-photon luminosity in the inclusive and exclusive scenarios, and demonstrate that the theoretical uncertainties associated with these are small. In the inclusive channel, we show how simple cuts on the final state may help to isolate the photon-photon induced cross section from any gluongluon or vector boson fusion induced contribution. In the exclusive case, that is where both protons remain intact after the collision, we present a precise cross section evaluation and show how this mode is sensitive to the parity of the object, as well as potential CP -violating effects. We also comment on the case of heavy-ion collisions and consider the production of new heavy colourless fermions, which may couple to such a resonance.

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“…This is the same energy range with the same constraints as used in the Block-Halzen fits based on analytic amplitudes with a ln 2 s high energy behavior [2,9]. However, we include the newer data at very high energies from the Large Hadron Collider (LHC) [12][13][14][15][16] and the Auger [17] and HiRes [18] collaborations.…”

Section: Fit To High Energy Proton-proton and Antiproton-proton mentioning

confidence: 99%

“…The value predicted for the LHC at W = 7 TeV is ρ = 0.133. The data for B include the TOTEM results [15,16] from the LHC at W = 7 TeV.…”

Section: Fit To High Energy Proton-proton and Antiproton-proton mentioning

confidence: 99%

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

Block

Durand

et al. 2015

Phys. Rev. D

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We make a detailed eikonal fit to current data on the total and elastic scattering cross sections, the ratios ρ of the real to the imaginary parts of the forward elastic scattering amplitudes, and the logarithmic slopes B of the differential cross sections dσ/dt at t = 0, for proton-proton and antiproton-proton scattering at center-of-mass energies W from 5 GeV to 57 TeV. The fit allows us to investigate the structure of the eikonal amplitudes in detail, including the impact-parameter structure of the energy-independent edge in the scattering amplitude shown to exist by Block et al.[1]. We show that the edge region has an essentially fixed shape with a peak at approximately the "black disk" radius Rtot = σtot/2π of the scattering amplitude, a constant width t edge ≈ 1 fm, and migrates to larger impact parameters with increasing energy proportionally to Rtot. We comment on possible physical mechanisms which could lead to the edge. We show that the eikonal results for the cross sections and ρ values are described to high accuracy by analytic expressions of the forms used in earlier analyses by Block and Halzen, and extend the result to the elastic-scattering slope parameter B. These expressions provide simple extrapolations of the results to much higher energies where the cross sections approach the black disk limit with σ elas , σ inel → σtot/2 and B → σtot/8π. Finally, we calculate the survival probabilities for large rapidity gaps in the scattering.

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Measurement of proton-proton elastic scattering and total cross-section at \chem{\sqrt {s} = 7\,TeV}

Cited by 211 publications

References 26 publications

Results and Perspectives in Forward Physics with ATLAS

Results and Perspectives in Forward Physics with ATLAS

The production of a diphoton resonance via photon-photon fusion

Eikonal fit toppandp¯pscattering and the edge in the scattering amplitude

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