Medium modification of the shape of small-radius jets in central Pb-Pb collisions at root s(NN)=2:76 TeV
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A. and Zimmermann, M. B. and Zinovjev, G. and Zmeskal, J. and The ALICE
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Abstract
We present the measurement of a new set of jet shape observables for
trackbased jets in central Pb-Pb collisions at p sNN = 2 : 76TeV. The
set of jet shapes includes the fi rst radial moment or angularity, g;
the momentum dispersion, pTD; and the di ff erence between the leading
and sub-leading constituent track transverse momentum, LeSub. These
observables provide complementary information on the jet fragmentation
and can constrain di ff erent aspects of the theoretical description of
jet-mediuum interactions. The jet shapes were measured for a small
resolution parameter R = 0 : 2 and were fully corrected to particle
level. The observed jet shape modi fi cations indicate that in-medium
fragmentation is harder and more collimated than vacuum fragmentation as
obtained by PYTHIA calculations, which were validated with the
measurements of the jet shapes in proton-proton collisions at p s =
7TeV. The comparison of the measured distributions to templates for
quark and gluon-initiated jets indicates that in-medium fragmentation
resembles that of quark jets in vacuum. We further argue that the
observed modi fi cations are not consistent with a totally coherent
energy loss picture where the jet loses energy as a single colour
charge, suggesting that the medium resolves the jet structure at the
angular scales probed by our measurements ( R = 0 : 2). Furthermore, we
observe that small-R jets can help to isolate purely energy loss e ff
ects from other e ff ects that contribute to the modi fi cations of the
jet shower in medium such as the correlated background or medium
response.... Show more Show less