Possible Implication of a Single Nonextensive p_T Distribution for Hadron Production in High-Energy pp Collisions

Conference · Thu Jan 01 04:00:00 EST 2015

OSTI ID:1185827

Wong, Cheuk-Yin ^[1]; Wilk, Grzegorz ^[2]; Cirto, Leonardo J. L. ^[3]; Tsallis, Constantino ^[4]

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1. ORNL
2. National Centre for Nuclear Research, Warsaw, Poland
3. Centro Brasileiro de Pesquisas Físicas (CBPF), Brazil
4. Centro Brasileiro de Pesquisas Fisicas, Brazil

Multiparticle production processes in $pp$ collisions at the central rapidity region are usually considered to be divided into independent "soft" and "hard" components. The first is described by exponential (thermal-like) transverse momentum spectra in the low-$$p_T$$ region with a scale parameter $$T$$ associated with the temperature of the hadronizing system. The second is governed by a power-like distributions of transverse momenta with power index $$n$$ at high-$$p_T$$ associated with the hard scattering between partons. We show that the hard-scattering integral can be approximated as a nonextensive distribution of a quasi-power-law containing a scale parameter $$T$$ and a power index $n=1/(q -1)$, where $$q$$ is the nonextensivity parameter. We demonstrate that the whole region of transverse momenta presently measurable at LHC experiments at central rapidity (in which the observed cross sections varies by $14$ orders of magnitude down to the low $$p_T$$ region) can be adequately described by a single nonextensive distribution. These results suggest the dominance of the hard-scattering hadron-production process and the approximate validity of a ``no-hair" statistical-mechanical description of the $$p_T$$ spectra for the whole $$p_T$$ region at central rapidity for $pp$ collisions at high-energies.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1185827
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS