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Study of QCD dynamics using small systems

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Abstract

The multiplicity, finite system size and collision energy dependence of heat capacity (\(C_V\)), conformal symmetry breaking measure (CSBM) and speed of sound (\(c_s\)) have been investigated using ALICE data for \(p+p\) collisions at \(\sqrt{s}\) = 7 TeV. The aim of this study is to ascertain the possibility of formation of a thermalized medium in such collisions. We find that there is a threshold in charged particle multiplicity beyond which \(C_V\), CSBM and \(c_s\) attain plateau. The presence of such threshold in multiplicity is further reflected in the variation of these quantities with center-of-mass energy (\(\sqrt{s}\)). In order to have a grasp on experimentally obtained results, variation of average transverse momentum with multiplicity has also been studied. The experimental results have been contrasted with PYTHIA8 and it is found that PYTHIA8 is inadequate to explain the features reflected in these quantities, thereby indicating the possibility of thermalization in such small system. It is also observed that the finite size effects alone cannot explain the non-extensive nature of particle spectra in \(p+p\) collisions.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: In this work we have analyzed publicly available experimental data which can be found from the list of references. The theoretical numbers obtained by the authors for the purpose of the analysis are available from the corresponding author upon reasonable request.]

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Acknowledgements

SD, GS and RNS acknowledge the financial supports from ALICE Project No. SR/MF/PS-01/2014-IITI(G) of Department of Science & Technology, Government of India. Further, R.S. acknowledges the financial supports from DAE-BRNS Project No. 58/14/29/2019-BRNS. JA is grateful to Tramabak Bhattacharyya for useful discussions.

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Authors and Affiliations

  1. Department of Physics, Indian Institute of Technology Indore, Simrol, Indore, 453552, India

    Suman Deb, Golam Sarwar & Raghunath Sahoo

  2. Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata, 700064, India

    Jan-e Alam

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  1. Suman Deb
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  2. Golam Sarwar
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  3. Raghunath Sahoo
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  4. Jan-e Alam
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Corresponding author

Correspondence to Raghunath Sahoo.

Additional information

Communicated by Tamas Biro.

Raghunath Sahoo is Presently CERN Scientific Associate, CERN, Geneva, Switzerland.

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Deb, S., Sarwar, G., Sahoo, R. et al. Study of QCD dynamics using small systems. Eur. Phys. J. A 57, 195 (2021). https://doi.org/10.1140/epja/s10050-021-00496-7

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