This paper presents a fully corrected measurement of the energy-energy correlator (EEC) within jets in pp collisions. The EEC traces the energy flow as a highly energetic parton undergoes a QCD shower followed by the confinement of partons into hadrons, probing the correlation function of the energy flow inside jets. The EEC observable is measured as a function of the charged particle pair angular distance, RL, for (Formula presented.). In the perturbative region (large RL), a good agreement between the data and a next-to-leading-log perturbative QCD calculation is observed. In the nonperturbative region (small RL), the data exhibit a linear RL dependence. There is a transition region in between, characterized by a turnover in the EEC distribution, indicating where hadronization effects begin to dominate. The peak of this transition region is located at (Formula presented) for jets of various energies, indicating a common energy scale for the hadronization process. State-of-the-art Monte Carlo event generators are compared with the measurements, and can be used to constrain the parton shower and hadronization mechanisms.

Exposing the parton-hadron transition within jets with energy-energy correlators in pp collisions at √ s = 5.02 TeV / Acharya, S., Agarwal, A., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. u., Ahuja, I., Akindinov, A., Akishina, V., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H. m., Alfaro Molina, R., Ali, B., Alici, A., Alizadehvandchali, N., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 114:3(2026). [10.1103/tgtl-7xh9]

Exposing the parton-hadron transition within jets with energy-energy correlators in pp collisions at √ s = 5.02 TeV

Bruno, G.  E.;Palasciano, A.;Triloki, T.;
2026

Abstract

This paper presents a fully corrected measurement of the energy-energy correlator (EEC) within jets in pp collisions. The EEC traces the energy flow as a highly energetic parton undergoes a QCD shower followed by the confinement of partons into hadrons, probing the correlation function of the energy flow inside jets. The EEC observable is measured as a function of the charged particle pair angular distance, RL, for (Formula presented.). In the perturbative region (large RL), a good agreement between the data and a next-to-leading-log perturbative QCD calculation is observed. In the nonperturbative region (small RL), the data exhibit a linear RL dependence. There is a transition region in between, characterized by a turnover in the EEC distribution, indicating where hadronization effects begin to dominate. The peak of this transition region is located at (Formula presented) for jets of various energies, indicating a common energy scale for the hadronization process. State-of-the-art Monte Carlo event generators are compared with the measurements, and can be used to constrain the parton shower and hadronization mechanisms.
2026
Exposing the parton-hadron transition within jets with energy-energy correlators in pp collisions at √ s = 5.02 TeV / Acharya, S., Agarwal, A., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. u., Ahuja, I., Akindinov, A., Akishina, V., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H. m., Alfaro Molina, R., Ali, B., Alici, A., Alizadehvandchali, N., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 114:3(2026). [10.1103/tgtl-7xh9]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/309400
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