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On the precise determination of the Tsallis parameters in proton–proton collisions at LHC energies

Trambak BhattacharyyaUCT-CERN Research Centre and Department of Physics, University of Cape Town, Rondebosch 7701, South AfricaJ. CleymansUCT-CERN Research Centre and Department of Physics, University of Cape Town, Rondebosch 7701, South AfricaLucas Murrins MarquesInstituto de Física, Universidade de São Paulo-IFUSP, Rua do Matão, Travessa R187, 05508-900 São Paulo, São Paulo, BrazilSylvain MogliacciUCT-CERN Research Centre and Department of Physics, University of Cape Town, Rondebosch 7701, South AfricaMasimba ParadzaDepartment of Physics and Astronomy, University of The Western Cape, Bellville 7535, South Africa

2018en

ABI

Annotatsiya

Abstract A detailed analysis is presented of the precise values of the Tsallis parameters obtained in p – p collisions for identified particles, pions, kaons and protons at the LHC at three beam energies <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msqrt> <mml:mrow> <mml:mi>s</mml:mi> </mml:mrow> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>0.9</mml:mn> <mml:mo>,</mml:mo> <mml:mn>2.76</mml:mn> </mml:math> and 7 TeV. Interpolated data at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msqrt> <mml:mrow> <mml:mi>s</mml:mi> </mml:mrow> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:math> TeV have also been included. It is shown that the Tsallis formula provides reasonably good fits to the p T distributions in p – p collisions at the LHC using three parameters d N /d y , T and q . However, the parameters T and q depend on the particle species and are different for pions, kaons and protons. As a consequence there is no m T scaling and also no universality of the parameters for different particle species.

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DOI: 10.1088/1361-6471/aaaea0

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