Observation of Medium-Induced Yield Enhancement and Acoplanarity Broadening of Low-pT Jets from Measurements in pp and Central Pb-Pb Collisions at √sNN=5.02 TeV

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초록

The ALICE Collaboration reports the measurement of semi-inclusive distributions of charged-particle jets recoiling from a high transverse momentum (high p(T)) hadron trigger in proton-proton and central Pb-Pb collisions at root S-NN = 5.02 TeV. A data-driven statistical method is used to mitigate the large uncorrelated background in central Pb-Pb collisions. Recoil jet distributions are reported for jet resolution parameter R = 0.2, 0.4, and 0.5 in the range 7 < p(T, jet) < 140 GeV/c and trigger-recoil jet azimuthal separation pi/2 < Delta phi < pi. The measurements exhibit a marked medium-induced jet yield enhancement at low pT and at large azimuthal deviation from Delta phi similar to pi. The enhancement is characterized by its dependence on Delta phi, which has a slope that differs from zero by 4.7 sigma. Comparisons to model calculations incorporating different formulations of jet quenching are reported. These comparisons indicate that the observed yield enhancement arises from the response of the QGP medium to jet propagation.

키워드

HEAVY-ION COLLISIONSQUARK-GLUON PLASMAPERSPECTIVEMATTER
제목
Observation of Medium-Induced Yield Enhancement and Acoplanarity Broadening of Low-pT Jets from Measurements in pp and Central Pb-Pb Collisions at √sNN=5.02 TeV
저자
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DOI
10.1103/PhysRevLett.133.022301
발행일
2024-07-09
유형
Article
저널명
Physical Review Letters
133
2