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SpringerOpen, The European Physical Journal C, 3(80), 2020

DOI: 10.1140/epjc/s10052-020-7675-6

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Measurement of $ϕ $ meson production in $p + p$ interactions at 40, 80 and $158 \, \hbox {GeV}/c$ with the NA61/SHINE spectrometer at the CERN SPS

Journal article published in 2020 by A. Aduszkiewicz, E. V. Andronov, T. Antićić, V. Babkin, M. Baszczyk, S. Bhosale, A. Blondel, M. Bogomilov, A. Brandin, A. Bravar, W. Bryliński, J. Brzychczyk, M. Buryakov, O. Busygina, A. Bzdak and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractResults on $ϕ $ϕ meson production in inelastic $p + p$p+p collisions at CERN SPS energies are presented. They are derived from data collected by the NA61/SHINE fixed target experiment, by means of invariant mass spectra fits in the $ϕ → K^+ K^- $ϕ→K+K- decay channel. They include the first ever measured double differential spectra of $ϕ $ϕ mesons as a function of rapidity $y$y and transverse momentum $p_{\text {T}}$pT for proton beam momenta of $80 \, \hbox {GeV}/c$80GeV/c and $158 \, \hbox {GeV}/c$158GeV/c, as well as single differential spectra of $y$y or $p_{\text {T}}$pT for beam momentum of $40 \, \hbox {GeV}/c$40GeV/c. The corresponding total $ϕ $ϕ yields per inelastic $p + p$p+p event are obtained. These results are compared with existing data on $ϕ $ϕ meson production in $p + p$p+p collisions. The comparison shows consistency but superior accuracy of the present measurements. The emission of $ϕ $ϕ mesons in $p + p$p+p reactions is confronted with that occurring in $\mathrm{Pb} + \mathrm{Pb}$Pb+Pb collisions, and the experimental results are compared with model predictions. It appears that none of the considered models can properly describe all the experimental observations.