New insights into hadron production mechanism from $p_T$ spectra in $pp$ collisions at $\sqrt{s}=7$ TeV

Abstract

We show that the experimental data of mid-rapidity $p_T$ spectra for proton, $\Lambda$, $\Xi$ , ${\Omega }^{-}$, ${\text{K(892)}}^{\ast 0}$ and $\Xi (1530{)}^{\ast 0}$ in minimum-bias $pp$ collisions at $\sqrt{s}=7$ TeV can be systemically explained by the quark combination mechanism of hadronization. The averaged transverse momentum $⟨p_T⟩$ and spectra ratios such as $\Xi /\Lambda$ and $\Omega /\varphi$ calculated from quark combination reproduce the data much better than those from traditional string and/or cluster fragmentation. The available data of hadronic $p_T$ spectra released by ALICE collaboration in the first three high-multiplicity classes of $pp$ collisions at $\sqrt{s}=7$ TeV are also well explained. We make predictions for other hadrons, and propose two scaling behaviors among decuplet baryons and vector mesons as the effective probe of hadron production mechanism at such high collision energy.

11 pages, 10 figures

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Cited by in corpus (13)

• Measurement of the production cross section of prompt ${\Xi }_{\mathrm{c}}^0$ baryons at midrapidity in pp collisions at $\sqrt{s}$ = 5.02 TeV
• First measurement of ${\Lambda }_{\mathrm{c}}^{+}$ production down to $p_{\mathrm{T}}=0$ in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Production of light flavor and single-charmed hadrons in $pp$ collisions at $\sqrt{s}=5.02$ TeV in an equal-velocity quark combination model
• Quark number scaling of $p_T$ spectra for $\Omega$ and $\varphi$ in relativistic heavy-ion collisions
• Elliptic flow of hadrons in equal-velocity quark combination mechanism in relativistic heavy-ion collisions
• Strange hadron production in a quark combination model in Au+Au collisions at RHIC energies
• Charmed hadron production via equal-velocity quark combination in ultra-relativistic heavy ion collisions
• Averaged transverse momentum correlations of hadrons in relativistic heavy-ion collisions
• Signals of quark combination at hadronization in $pp$ collisions at $\sqrt{s}=200$ GeV
• Production of Strange and Charm Hadrons in Pb+Pb Collisions at $\sqrt{s_{NN}}=$ 5.02 TeV
• Transverse momentum and multiplicity dependence of ${\Lambda }_c^{+}/D^0$ ratio in $pp$ collisions at $\sqrt{s}=13$ TeV
• Universality of scaled particle spectra in ultrarelativistic heavy-ion collisions
• The domain of soft hadrons in transverse momentum space in high energy collisions