${\mathrm{f}}_0(980)$ production in inelastic pp collisions at $\sqrt{s}=5.02$ TeV

Abstract

The measurement of the production of ${\mathrm{f}}_0(980)$ in inelastic pp collisions at $\sqrt{s}=5.02$ TeV is presented. This is the first reported measurement of inclusive ${\mathrm{f}}_0(980)$ yield at LHC energies. The production is measured at midrapidity, $|y|<0.5$, in a wide transverse momentum range, $0<p_{\mathrm{T}}<16$ GeV/$c$, by reconstructing the resonance in the ${\mathrm{f}}_0(980)\to {\pi }^{+}{\pi }^{-}$ hadronic decay channel using the ALICE detector. The $p_{\mathrm{T}}$-differential yields are compared to those of pions, protons and $\varphi$ mesons as well as to predictions from the HERWIG 7.2 QCD-inspired Monte Carlo event generator and calculations from a coalescence model that uses the AMPT model as an input. The ratio of the $p_{\mathrm{T}}$-integrated yield of ${\mathrm{f}}_0(980)$ relative to pions is compared to measurements in ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ and pp collisions at lower energies and predictions from statistical hadronisation models and HERWIG 7.2. A mild collision energy dependence of the ${\mathrm{f}}_0(980)$ to pion production is observed in pp collisions from SPS to LHC energies. All considered models underpredict the $p_{\mathrm{T}}$-integrated $2{\mathrm{f}}_0(980)/({\pi }^{+}+{\pi }^{-})$ ratio. The prediction from the canonical statistical hadronisation model assuming a zero total strangeness content of ${\mathrm{f}}_0(980)$ is consistent with the data within 1.9$\sigma$ and is the closest to the data. The results provide an essential reference for future measurements of the particle yield and nuclear modification in p$-$Pb and Pb$-$Pb collisions, which have been proposed to be instrumental to probe the elusive nature and quark composition of the ${\mathrm{f}}_0(980)$ scalar meson.

arXiv comment23 pages, 5 captioned figures, 1 table, authors from page 18, published version, figures at http://alice-publications.web.cern.ch/node/8276

References in corpus (42)

• Herwig++ Physics and Manual
• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• Herwig 7.0 / Herwig++ 3.0 Release Note
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Hadronization in heavy ion collisions: Recombination and fragmentation of partons
• Decoding the phase structure of QCD via particle production at high energy
• Chiral crossover in QCD at zero and non-zero chemical potentials
• Formation of superdense hadronic matter in high energy heavy-ion collisions
• ZPC 1.0.1: a parton cascade for ultrarelativistic heavy ion collisions
• A new look at scalar mesons
• Scalar mesons above and below 1 GeV
• Partonic effects on the elliptic flow at relativistic heavy ion collisions
• Two-pion Bose-Einstein correlations in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Thermal hadron production in pp and p{\bar p} collisions
• On the structure of the scalar mesons $f_0(975)$ and $a_0(980)$
• K*(892)${}^0$ and $\Phi$(1020) production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Measurement of pion, kaon and proton production in proton-proton collisions at $\sqrt{s}=7$ TeV
• Charmed Hadrons from Coalescence plus Fragmentation in relativistic nucleus-nucleus collisions at RHIC and LHC
• Exotic Hadrons from Heavy Ion Collisions
• Study of the $D_s^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decay and measurement of $f_0$ masses and widths
• Coherent rho^0 Production in Ultra-Peripheral Heavy Ion Collisions
• Study of the Decay phi --> eta pi0 gamma with the KLOE detector
• Measurement of resonant and $CP$ components in ${\overline{B}}_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• The Thermal Production of Strange and Non-Strange Hadrons in e+e- Collisions
• Canonical statistical model analysis of p-p, p-Pb, and Pb-Pb collisions at the LHC
• The $\varphi \to \eta {\pi }^0\gamma$ decay
• Measurement of the resonant and CP components in ${\overline{B}}^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Evidence of rescattering effect in Pb-Pb collisions at the LHC through production of ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons
• Use of B->J/ψf0 decays to discern the q anti-q or tetraquark nature of scalar mesons
• Radiative decays of ϕ-meson and nature of light scalar resonances
• Dalitz plot analysis of e+ e- --> pi0 pi0 gamma events at SQRT(s) ~ M(phi) with the KLOE detector
• An amplitude analysis of the ${\pi }^0{\pi }^0$ system produced in radiative $J/\psi$ decays
• Production of the $\rho$(770)${}^0$ meson in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Study the molecular nature of $\sigma$, $f_0(980)$, and $a_0(980)$ states
• First observation of the $\varphi \to {\pi }^{+}{\pi }^{-}\gamma$ decay
• Evidence for two-quark content of $f_0(980)$ in exclusive $b\to c$ decays
• Evidence of the four-quark nature of $f_0(980)$ and $f_0(500)$
• Counting valence quarks at RHIC and LHC
• Investigation of $J/\psi \to \gamma {\pi }^0\eta ({\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0)$ radiative decays including final-state interactions
• Production of $f_0(980)$ meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion
• Elliptical flow coalescence to identify the $f_0$(980) content