Measurements of charged-particle multiplicity dependence of higher-order net-proton cumulants in p + p collisions at s=200 GeV from STAR at RHIC

Measurements of charged-particle multiplicity dependence of higher-order net-proton cumulants in p + p collisions at s=200 GeV from STAR at RHIC

We report on the charged-particle multiplicity dependence of net-proton cumulant ratios up to sixth order from s=200 GeV p+p collisions at the Relativistic Heavy Ion Collider (RHIC). The measured ratios C4/C2, C5/C1, and C6/C2 decrease with increased charged-particle multiplicity and rapidity accept...

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Veröffentlicht in:Physics letters. B 2024-10, Vol.857, p.138966, Article 138966
Hauptverfasser: Aggarwal, I., Bellwied, R., Bhasin, A., Bhatta, S., Bhosale, S.R., Brandenburg, J.D., Cebra, D., Ceska, J., Chakaberia, I., Chaloupka, P., Chen, J., Cheng, Y., Crawford, H.J., Dale-Gau, G., Drachenberg, J.L., Engelage, J., Evdokimov, O., Fatemi, R., Finch, E., Fisyak, Y., Gou, X., Gupta, A., Harabasz, S., He, W., He, X.H., Ju, X., Judd, E.G., Kalinkin, D., Khanal, A., Kisel, I., Kiselev, A., Kołaś, J., Lacey, R., Lauret, J., Leung, Y.H., Li, X., Li, Y., Li, Z., Liu, C., Liu, T., Liu, X., Liu, Y., Lomicky, O., Luo, X.F., Markert, C., Mioduszewski, S., Mooney, I., Nain, A.S., Nam, J.D., Neff, D., Nelson, J.M., Nishitani, R., Odyniec, G., Oh, S., Pani, T., Pawlowska, D., Perkins, C., Pruthi, N.K., Przybycien, M., Racz, C., Ray, R.L., Rosales Aguilar, M.A., Roy, D., Sahoo, N.R., Sato, S., Schmidke, W.B., Shah, N., Shao, T., Shi, S.S., Singh, J., Sinha, P., Skoby, M.J., Smirnov, N., Song, Y., Srivastava, B., Sumbera, M., Sun, X., Sun, Y., Tang, A.H., Tang, Z., Tarnowsky, T., Tlusty, D., Tripathy, S.K., Tu, Z., Ullrich, T., Wang, K., Webb, J.C., Weidenkaff, P.C., Wilks, G., Wu, J., Wu, X., Xu, H., Yang, C., Ye, Z., Zbroszczyk, H., Zhang, X., Zhang, Z.J., Zhao, J., Zhao, M., Zhu, X.
Format: Artikel
Sprache:eng
Schlagworte:
Crossover
Event-by-event fluctuation
Higher-order cumulant
QCD phase diagram
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Zusammenfassung:We report on the charged-particle multiplicity dependence of net-proton cumulant ratios up to sixth order from s=200 GeV p+p collisions at the Relativistic Heavy Ion Collider (RHIC). The measured ratios C4/C2, C5/C1, and C6/C2 decrease with increased charged-particle multiplicity and rapidity acceptance. Neither the Skellam baselines nor PYTHIA8 calculations account for the observed multiplicity dependence. In addition, the ratios C5/C1 and C6/C2 approach negative values in the highest-multiplicity events, which implies that thermalized QCD matter may be formed in p+p collisions.
ISSN:0370-2693
DOI:10.1016/j.physletb.2024.138966