Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN=2:76 TeV

  • Acharya, S.
  • Acosta, F. T. -
  • Adamova, D.
  • Adler, A.
  • Adolfsson, J.
  • ... Yoon, J. H.
  • 외 1,011명
Citations

WEB OF SCIENCE

37
Citations

SCOPUS

44

초록

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-medium 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.

키워드

Heavy Ion ExperimentsTRANSVERSE-MOMENTUMDEPENDENCE
제목
Medium modification of the shape of small-radius jets in central Pb-Pb collisions at √sNN=2:76 TeV
저자
Acharya, S.Acosta, F. T. -Adamova, D.Adler, A.Adolfsson, J.Aggarwal, M. M.Aglieri Rinella, G.Agnello, M.Agrawal, N.Ahammed, Z.Ahn, S. U.Aiola, S.Akindinov, A.Al-Turany, M.Alam, S. N.Albuquerque, D. S. D.Aleksandrov, D.Alessandro, B.Alfaro Molina, R.Ali, Y.Alici, A.Alkin, A.Alme, J.Alt, T.Altenkamper, L.Altsybeev, I.Anaam, M. N.Andrei, C.Andreou, D.Andrews, H. A.Andronic, A.Angeletti, M.Anguelov, V.Anson, C.Anticic, T.Antinori, F.Antonioli, P.Anwar, R.Apadula, N.Aphecetche, L.Appelshaeuser, H.Arcelli, S.Arnaldi, R.Arsene, I. C.Arslandok, M.Augustinus, A.Averbeck, R.Azmi, M. D.Badala, A.Baek, Y. W.Bagnasco, S.Bailhache, R.Bala, R.Baldisseri, A.Ball, M.Baral, R. C.Barbano, A. M.Barbera, R.Barile, F.Barioglio, L.Barnafoeldi, G. G.Barnby, L. S.Barret, V.Bartalini, P.Barth, K.Bartsch, E.Bastid, N.Basu, S.Batigne, G.Batyunya, B.Batzing, P. C.Bazo Alba, J. L.Bearden, I. G.Beck, H.Bedda, C.Behera, N. K.Belikov, I.Bellini, F.Bello Martinez, H.Bellwied, R.Beltran, L. G. 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DOI
10.1007/JHEP10(2018)139
발행일
2018-10
유형
Article
저널명
Journal of High Energy Physics
10