Apr 4 – 10, 2022
Auditorium Maximum UJ
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Proceedings submission deadline extended to September 11, 2022

Two-particle correlation in e+e- collisions at 91-209 GeV with archived ALEPH data

Apr 6, 2022, 3:00 PM
medium aula B (Auditorium Maximum UJ)

medium aula B

Auditorium Maximum UJ

Oral presentation QGP in small and medium systems Parallel Session T05: QGP in small and medium systems


Yi Chen (Massachusetts Inst. of Technology (US))


The first measurement of $anti-k_{T}$ jets and two-particle angular correlations of charged particles emitted in high energy $e^+e^−$ annihilation is presented. The archived data at a center-of-mass energy of 91-209 GeV were collected with the ALEPH detector at LEP between 1992 and 2000.

At 91 GeV, no significant long-range correlation was observed in either the lab coordinate analysis or the thrust coordinate analysis, where the latter is sensitive to a medium expanding transverse to the color string between the outgoing $q\bar{q}$ pair from Z boson decays. We also present the first measurement of anti-$k_{T}$ jet energy spectra and substructures compared to various event generators, NLO, and NLL'+R resummation calculations.

The correlation functions are measured over a broad range of pseudorapidity and full azimuth as a function of charged particle multiplicity for the first time with LEP2 data. This data set provides higher event multiplicity reach up to around 50 and a chance to sample different underlying hard-scattering processes. Studies of the high energy annihilation data will expand our search for collective phenomena in $e^+e^−$ collisions to a new phase space for a potential discovery.

Primary authors

Anthony Badea (Harvard University (US)) Austin Alan Baty (Rice University (US)) Christopher McGinn (CU Boulder) Dennis Perepelitsa (CU Boulder) Gian Michele Innocenti (CERN) Marcello Maggi (Universita e INFN, Bari (IT)) Michael Joseph Peters (Massachusetts Inst. of Technology (US)) Paoti Chang (National Taiwan University) Tzu-An Sheng (Massachusetts Inst. of Technology (US)) Yen-Jie Lee (Massachusetts Inst. of Technology (US)) Yi Chen (Massachusetts Inst. of Technology (US)) Yu-Chen (Janice) Chen (Massachusetts Institute of Technology)

Presentation materials