Measurement of elastic pp scattering at $$\sqrt{\hbox {s}} = \hbox {8}$$ s = 8  TeV in the Coulomb–nuclear interference region: determination of the $$\mathbf {\rho }$$ ρ -parameter and the total cross-section

Antchev, G.; Aspell, P.; Atanassov, I.; Avati, V.; Baechler, J.; Berardi, V.; Berretti, M.; Bossini, E.; Bottigli, U.; Bozzo, M.; Broulím, Pavel; Burkhardt, H.; Buzzo, A.; Cafagna, F.; Campanella, Carlo Edoardo; Catanesi, M. G.; Csanád, M.; Csörgő, T.; Deile, M.; Leonardis, Francesco De; D’Orazio, A.; Doubek, M.; Eggert, K.; Eremin, V.; Ferro, F.; Fiergolski, A.; García, F.; Georgiev, V.; Gianì, S.; Grzanka, L.; Guaragnella, Cataldo; Hammerbauer, J.; Heino, J.; Karev, A.; Kašpar, J.; Kopal, J.; Kundrát, V.; Lami, S.; Latino, G.; Lauhakangas, R.; Linhart, R.; Lippmaa, É.; Lippmaa, J.; Lokajíček, M.; Losurdo, L.; Vetere, M. Lo; Rodríguez, F. Lucas; Macrı́, M.; Mercadante, A.; Minafra, N.; Minutoli, S.; Naaranoja, T.; Nemes, F.; Niewiadomski, H.; Oliveri, E.; Oljemark, F.; Orava, R.; Oriunno, M.; Österberg, K.; Palazzi, P.; Palocko, Lukas; Passaro, Vittorio M. N.; Peroutka, Zdeněk; Petruzzelli, V.; Politi, T.; Procházka, J.; Prudenzano, Francesco; Quinto, M.; Radermacher, E.; Radicioni, E.; Ravotti, F.; Redaelli, Stefano; Robutti, E.; Ropelewski, L.; Ruggiero, G.; Saarikko, H.; Salvachua, Belen; Scribano, A.; Smajek, J.; Snoeys, W.; Sziklai, J.; Taylor, C.; Turini, N.; Vacek, V.; Valentino, Gianluca; Welti, J.; Wenninger, J.; Wyszkowski, P.; Zieliński, Krzysztof

doi:10.1140/epjc/s10052-016-4399-8

Cited by 110 publications

(83 citation statements)

References 43 publications

(88 reference statements)

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“…The real part was predicted to be small inside the cone at high enough energies. That is now confirmed by experimental data [25]. The ratio of real to imaginary part of forward pp-amplitude changes from 0.14 at ISR-energies to 0.1 at 13 TeV.…”

Section: The Elastic Differential Cross Sectionsupporting

confidence: 76%

Several Effects Unexplained by QCD

Dremin

2018

Universe

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Abstract:Several new experimental discoveries in high energy proton interactions, yet unexplained by QCD, are discussed in the paper. The increase of the cross sections with increasing energy from ISR to LHC, the correlation between it and the behavior of the slope of the elastic diffraction cone, the unexpected increase of the survival probability of protons in the same energy range, the new structure of the elastic differential cross section at rather large transferred momenta (small distances) and the peculiar ridge effect in high multiplicity inelastic processes are still waiting for QCD interpretation and deeper insight in vacuum.

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Section: The Elastic Differential Cross Sectionsupporting

confidence: 76%

Several Effects Unexplained by QCD

Dremin

2018

Universe

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“…Although at the small transferred momenta interference of the hadronic phase with the Coulomb one can become prominent [47], the asymmetry (unlike the one for electron scattering) stays too small due to the large σ b . Thus the effects of the amplitude's phase are governed by width of the colliding beams.…”

Section: Jhep03(2017)049mentioning

confidence: 96%

“…A proper analysis of the elastic proton-proton collisions at the Large Hadron Collider (LHC) at √ s = 7 TeV by the TOTEM collaboration [44,45] has also shown that the real part of the amplitude can dominate for the large transferred momenta [46]. Finally, just a few months ago the TOTEM collaboration managed to estimate the amplitude's phase at √ s = 8 TeV in the interval of |t| from 6 × 10 −4 GeV 2 to 0.2 GeV 2 with a much better accuracy than before [47].…”

Section: Jhep03(2017)049mentioning

confidence: 99%

“…Returning to the elastic scattering of protons, little can be said, unfortunately, in a model-independent way about the factor in the left-hand-side of (5.12). The TOTEM collaboration has managed to perform measurements at the scattering angles lower than 10 −5 at √ s = 8 TeV [47], which yields γθ sc ∼ 10 −2 −10 −1 , and the hadronic phase ζ f i itself, unlike the Coulomb one, is not attenuated by a small parameter α em → α s , as scattering within a diffraction cone is not described by the perturbation theory.…”

Section: Jhep03(2017)049mentioning

confidence: 99%

“…As an example let us take three following models for the hadronic phase employed in the recent experiment at the LHC [47]: …”

Section: Jhep03(2017)049mentioning

confidence: 99%

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Scattering of wave packets with phases

Karlovets

2017

J. High Energ. Phys.

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A general problem of 2 → N f scattering is addressed with all the states being wave packets with arbitrary phases. Depending on these phases, one deals with coherent states in (3 + 1) D, vortex particles with orbital angular momentum, the Airy beams, and their generalizations. A method is developed in which a number of events represents a functional of the Wigner functions of such states. Using width of a packet σ p / p as a small parameter, the Wigner functions, the number of events, and a cross section are represented as power series in this parameter, the first non-vanishing corrections to their plane-wave expressions are derived, and generalizations for beams are made. Although in this regime the Wigner functions turn out to be everywhere positive, the cross section develops new specifically quantum features, inaccessible in the plane-wave approximation. Among them is dependence on an impact parameter between the beams, on phases of the incoming states, and on a phase of the scattering amplitude. A model-independent analysis of these effects is made. Two ways of measuring how a Coulomb phase and a hadronic one change with a transferred momentum t are discussed.

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Elastic proton-proton scattering at LHC energies in holographic QCD

Xie

Watanabe

Huang

2019

J. High Energ. Phys.

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The cross sections of the high energy proton-proton scattering are studied in a holographic QCD model, focusing on the Regge regime. In our model setup, the involved nonperturbative partonic dynamics is described by the Pomeron exchange, which is realized by applying the Reggeized spin-2 particle propagator together with the proton gravitational form factor obtained from the bottom-up AdS/QCD model. Our model includes three adjustable parameters which are to be fitted by experimental data. We show that both the resulting differential and total cross sections are consistent with data, including the ones recently measured at √ s = 13 TeV by the TOTEM collaboration at the LHC. Our results imply that the present framework works well in the considered TeV scale, and further applications to other high energy scattering processes, in which the involved strong interaction can be approximated by the Pomeron exchange, are possible.

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Measurement of elastic pp scattering at $$\sqrt{\hbox {s}} = \hbox {8}$$ s = 8 TeV in the Coulomb–nuclear interference region: determination of the $$\mathbf {\rho }$$ ρ -parameter and the total cross-section

Cited by 110 publications

References 43 publications

Several Effects Unexplained by QCD

Several Effects Unexplained by QCD

Scattering of wave packets with phases

Elastic proton-proton scattering at LHC energies in holographic QCD

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