New insights into hadron production mechanism from pT spectra in pp collisions at s=7 TeV

We show that the experimental data of midrapidity pT spectra for p, Λ, Ξ, Ω−, K(892)*0, and Ξ(1530)*0 in minimum-bias pp collisions at s=7  TeV can be well fitted by the quark combination mechanism with the parametrized up(down) quark spectrum and strange quark spectrum at hadronization. The average...

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Bibliographic Details
Published in:Physical review. D 2017-11, Vol.96 (9)
Main Authors: Gou, Xing-rui, Shao, Feng-lan, Wang, Rui-qin, Li, Hai-hong, Song, Jun
Format: Article
Language:English
Subjects:
Collision dynamics
Dependence
Hadrons
Heavy ions
Ionic collisions
Mesons
Quarks
Transverse momentum
Vector mesons
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Summary:We show that the experimental data of midrapidity pT spectra for p, Λ, Ξ, Ω−, K(892)*0, and Ξ(1530)*0 in minimum-bias pp collisions at s=7  TeV can be well fitted by the quark combination mechanism with the parametrized up(down) quark spectrum and strange quark spectrum at hadronization. The averaged transverse momentum ⟨pT⟩ and spectrum ratios such as Ξ/Λ and Ω/ϕ calculated from quark combination reproduce the data quite well. The available data of hadronic pT spectra released by ALICE collaboration in the first three high-multiplicity classes of pp collisions at s=7  TeV are also well fitted. The extracted quark spectra at hadronization exhibit a dependence on the multiplicity class and also show a certain similarity to those obtained in p−Pb collisions at LHC and in relativistic heavy ion collisions. 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 energies.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.96.094010