Can Transverse Mass Scaling Shed Light on the Event-Activity Dependence of ${\rm Y}$ Mesons Production at LHC?

Abstract

Measurements by the CMS experiment [CMS Collaboration, JHEP04 (2014) 103; CMS Collaboration, JHEP11 (2020) 001] reveal a deficit of charged particle tracks in events with higher ${\rm Y}$(nS) states. This observation is suggested to be a manifestation of the excited bottomonia suppression in $pp$ interactions. Transverse mass ($m_{\mathrm{T}}$) scaling can be implied to check this assumption in an independent way. The scaling has been observed for a wide range of particle species in proton-proton collisions at various energies from the SPS to RHIC and the LHC. The observed scaling is known to be different for baryons and mesons, and this work presents a comprehensive study of the $m_{\mathrm{T}}$-scaling of mesons at LHC energies with a focus on heavier mesons. The study demonstrates patterns in the scaling properties of mesons, which are related to the particle quark content. In particular, light species and ground-state quarkonia obey the same scaling, whereas open-flavor particles deviate from it because their spectra are significantly harder. The magnitude of deviation depends on the flavor of the heaviest quark in the meson. By extending the $m_{\mathrm{T}}$-scaling assumption to the excited bottomonia states, it is observed that the measured cross sections of ${\rm Y}$(2S) and ${\rm Y}$(3S) are reduced by factors of 1.6 and 2.4 compared to the expectation from the scaling. This observation is consistent with recently observed differences between the event-activity dependence of different ${\rm Y}$(nS) meson states.

arXiv comment7 pages, 3 figures

References in corpus (56)

• An Introduction to PYTHIA 8.2
• Heavy-flavour and quarkonium production in the LHC era: from proton-proton to heavy-ion collisions
• Measurements of Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200 GeV
• Measurement of J/psi production in pp collisions at sqrt(s)=7 TeV
• Measurement of neutral mesons in p+p collisions at sqrt(s) = 200 GeV and scaling properties of hadron production
• Measurement of the differential cross-sections of inclusive, prompt and non-prompt J/psi production in proton-proton collisions at sqrt(s) = 7 TeV
• Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV
• Measurement of pion, kaon and proton production in proton-proton collisions at $\sqrt{s}=7$ TeV
• Measurements of prompt charm production cross-sections in $pp$ collisions at $\sqrt{s}=13\mathrm{TeV}$
• Neutral pion and $\eta$ meson production in proton-proton collisions at $\sqrt{s}=0.9$ TeV and $\sqrt{s}=7$ TeV
• Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum in p-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}$ = 5.02 TeV
• J/psi and psi(2S) production in pp collisions at sqrt(s) = 7 TeV
• Measurement of D-meson production at mid-rapidity in pp collisions at $\sqrt{\mathbf{s}}=7$ TeV
• Measurement of the B+ Production Cross Section in pp Collisions at sqrt(s) = 7 TeV
• Measurement of Upsilon production in 7 TeV pp collisions at ATLAS
• Measurement of forward $J/\psi$ production cross-sections in $pp$ collisions at $\sqrt{s}=13$ TeV
• Event activity dependence of Y(nS) production in sqrt(s[NN]) = 5.02 TeV pPb and sqrt(s) = 2.76 TeV pp collisions
• Production of J/psi and Upsilon mesons in pp collisions at sqrt(s) = 8 TeV
• Measurement of the differential cross-sections of prompt and non-prompt production of $J/\psi$ and $\psi (2\mathrm{S})$ in $pp$ collisions at $\sqrt{s}=7$ and $8$ TeV with the ATLAS detector
• Measurement of J/psi and psi(2S) prompt double-differential cross sections in pp collisions at sqrt(s) = 7 TeV
• Measurement of B meson production cross-sections in proton-proton collisions at sqrt(s)= 7 TeV
• Measurements of $\psi (2S)$ and $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Production of light-flavor hadrons in pp collisions at $\sqrt{s}$ = 7 and $\sqrt{s}$ = 13 TeV
• Measurement of the B0 production cross section in pp Collisions at sqrt(s) = 7 TeV
• Measurement of quarkonium production cross sections in pp collisions at $\sqrt{s}=$ 13 TeV
• ${\pi }^0$ and $\eta$ meson production in proton-proton collisions at $\sqrt{s}=8$ TeV
• Measurement of $D^{\ast \pm }$, $D^{\pm }$ and $D_s^{\pm }$ meson production cross sections in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Measurement of the Y(1S), Y(2S), and Y(3S) cross sections in pp collisions at sqrt(s) = 7 TeV
• The nature of $X(3872)$ from high-multiplicity $pp$ collisions
• Measurement of charged pion, kaon, and proton production in proton-proton collisions at sqrt(s) = 13 TeV
• ${\rm Y}(nS)$ and ${\chi }_b(nP)$ production at hadron colliders in nonrelativistic QCD
• Energy dependence of forward-rapidity J/$\psi$ and $\psi (2S)$ production in pp collisions at the LHC
• Measurement of ${\rm Y}$ production in $pp$ collisions at $\sqrt{s}$= 13 TeV
• Measurement of the Strange B Meson Production Cross Section with J/Psi phi Decays in pp Collisions at sqrt(s) = 7 TeV
• Measurement of chi_c1 and chi_c2 production with sqrt(s) = 7 TeV pp collisions at ATLAS
• Forward production of ${\rm Y}$ mesons in $pp$ collisions at $\sqrt{s}=7$ and 8TeV
• Inclusive quarkonium production at forward rapidity in pp collisions at $\sqrt{s}=8$ TeV
• Measurement of the differential cross-section of B+ meson production in pp collisions at sqrt(s) = 7 TeV at ATLAS
• Kshort and Lambda production in pp interactions at sqrt(s) = 0.9 and 7 TeV measured with the ATLAS detector at the LHC
• Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at sqrt(s) = 7 TeV
• Using the Tsallis distribution for hadron spectra in $pp$ collisions: Pions and quarkonia at $\sqrt{s}$ = 5--13000 GeV
• Measurement of the total and differential inclusive B+ hadron cross sections in pp collisions at sqrt(s) = 13 TeV
• Meson $m_T$-scaling in heavy-ion collisions at SIS energies
• Measurement of the ${\eta }_c(1S)$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV
• Bottomonia production and polarization in the NRQCD with $k_T$-factorization. I: ${\rm Y}(3S)$ and ${\chi }_b(3P)$ mesons
• Investigation into the event-activity dependence of ${\rm Y}$(nS) relative production in proton-proton collisions at $\sqrt{s}=$ 7 TeV
• Applicability of transverse mass scaling in hadronic collisions at the LHC
• Measurement of the inclusive phi cross-section in pp collisions at sqrt(s) = 7 TeV
• ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ production at midrapidity in pp collisions at $\sqrt{s}$ = 8 TeV
• Mass hierarchy and energy scaling of the Tsallis--Pareto parameters in hadron productions at RHIC and LHC energies
• Measurement of psi(2S) production cross-sections in proton-proton collisions at 7 and 13 TeV
• Inclusive J/$\psi$ production at midrapidity in pp collisions at $\sqrt{s}=13$ TeV
• Energy dependence of $\varphi$ meson production at forward rapidity in pp collisions at the LHC
• Production of $\omega$ mesons in pp collisions at $\sqrt{s}$ = 7 TeV
• Bottomonia production and polarization in the NRQCD with $k_T$-factorization. II: ${\rm Y}(2S)$ and ${\chi }_b(2P)$ mesons
• Bottomonium production and polarization in the NRQCD with $k_T$-factorization. III: ${\rm Y}(1S)$ and ${\chi }_b(1P)$ mesons