Nonresonant central exclusive production of charged-hadron pairs in proton-proton collisions at sp = 13 TeV

(CMS collaboration) Hayrapetyan, Aram; ..., ...; Giljanović, Duje; Godinović, Nikola; Lelas, Damir; Šćulac, Ana; Kovač, Marko; Šćulac, Toni; Bargassa, Pedrame; Brigljević, Vuko; Chitroda, Bhakti Kanulal; Ferenček, Dinko; Mishra, Saswat; Starodumov, Andrey; Šuša, Tatjana; ..., ...; Zich, J. (2024) Nonresonant central exclusive production of charged-hadron pairs in proton-proton collisions at sp = 13 TeV. Physical review. D, 109 (1). ISSN 2470-0010

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Abstract

The central exclusive production of charged-hadron pairs in pp collisions at a centre-of-mass energy of 13 TeV is examined, based on data collected in a special high- run of the LHC. The nonresonant continuum processes are studied with the invariant mass of the centrally produced two-pion system in the resonance-free region, 0.7 GeV or 1.8 GeV. Differential cross sections as functions of the azimuthal angle between the surviving protons, squared exchanged four-momenta, and are measured in a wide region of scattered proton transverse momenta, between 0.2 and 0.8 GeV, and for pion rapidities 2. A rich structure of interactions related to double-pomeron exchange is observed. A parabolic minimum in the distribution of the two-proton azimuthal angle is observed for the first time. It can be interpreted as an effect of additional pomeron exchanges between the protons from the interference between the bare and the rescattered amplitudes. After model tuning, various physical quantities are determined that are related to the pomeron cross section, proton-pomeron and meson-pomeron form factors, pomeron trajectory and intercept, and coefficients of diffractive eigenstates of the proton.

Item Type:	Article
Uncontrolled Keywords:	High energy physics ; Experimental particle physics ; LHC ; CMS ; p p: scattering ; p p: colliding beams ; pi: pair production ; pomeron: trajectory ; pi: rapidity ; pomeron: exchange ; p: transverse momentum ; exclusive production ; interference ; diffraction ; mass spectrum: two-pion ; mass spectrum: (pi+ pi-) ; CERN LHC Coll ; differential cross section: measured ; angular dependence ; mass dependence ; momentum dependence ; form factor ; structure ; numerical calculations: Monte Carlo
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Depositing User:	Vuko Brigljević
Date Deposited:	15 Oct 2024 12:43
URI:	http://fulir.irb.hr/id/eprint/9163
DOI:	10.1103/PhysRevD.109.112013

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