@article{3181839,
    title = "Medium modification of the shape of small-radius jets in central Pb-Pb
collisions at root s(NN)=2:76 TeV",
    author = "Acharya, S. and Acosta, F. T. - and Adamova, D. and Adler, A. and and Adolfsson, J. and Aggarwal, M. M. and Aglieri Rinella, G. and Agnello, and M. and Agrawal, N. and Ahammed, Z. and Ahn, S. U. and Aiola, S. and and Akindinov, A. and Al-Turany, M. and Alam, S. N. and Albuquerque, D. S. and D. and Aleksandrov, D. and Alessandro, B. and Alfaro Molina, R. and Ali, and Y. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altenkamper, and L. and Altsybeev, I. and Anaam, M. N. and Andrei, C. and Andreou, D. and and Andrews, H. A. and Andronic, A. and Angeletti, M. and Anguelov, V. and and Anson, C. and Anticic, T. and Antinori, F. and Antonioli, P. and Anwar, and R. and Apadula, N. and Aphecetche, L. and Appelshaeuser, H. and Arcelli, and S. and Arnaldi, R. and Arsene, I. C. and Arslandok, M. and Augustinus, and A. and Averbeck, R. and Azmi, M. D. and Badala, A. and Baek, Y. W. and and Bagnasco, S. and Bailhache, R. and Bala, R. and Baldisseri, A. and Ball, and M. and Baral, R. C. and Barbano, A. M. and Barbera, R. and Barile, F. and and Barioglio, L. and Barnafoeldi, G. G. and Barnby, L. S. and Barret, and V. and Bartalini, P. and Barth, K. and Bartsch, E. and Bastid, N. and and Basu, S. and Batigne, G. and Batyunya, B. and Batzing, P. C. and Bazo and Alba, J. L. and Bearden, I. G. and Beck, H. and Bedda, C. and Behera, N. and K. and Belikov, I. and Bellini, F. and Bello Martinez, H. and Bellwied, and R. and Beltran, L. G. E. and Belyaev, V. and Bencedi, G. and Beole, S. and and Bercuci, A. and Berdnikov, Y. and Berenyi, D. and Bertens, R. A. and and Berzano, D. and Betev, L. and Bhaduri, P. P. and Bhasin, A. and Bhat, I. and R. and Bhatt, H. and Bhattacharjee, B. and Bhom, J. and Bianchi, A. and and Bianchi, L. and Bianchi, N. and Bielcik, J. and Bielcikova, J. and and Bilandzic, A. and Biro, G. and Biswas, R. and Biswas, S. and Blair, J. and T. and Blau, D. and Blume, C. and Boca, G. and Bock, F. and Bogdanov, A. and and Boldizsar, L. and Bombara, M. and Bonomi, G. and Bonora, M. and and Borel, H. and Borissov, A. and Borri, M. and Botta, E. and Bourjau, C. and and Bratrud, L. and Braun-Munzinger, P. and Bregant, M. and Broker, T. and A. and Broz, M. and Brucken, E. J. and Bruna, E. and Bruno, G. E. and and Budnikov, D. and Buesching, H. and Bufalino, S. and Buhler, P. and and Buncic, P. and Busch, O. and Buthelezi, Z. and Butt, J. B. and Buxton, and J. T. and Cabala, J. and Caffarri, D. and Caines, H. and Caliva, A. and and Calvo Villar, E. and Camacho, R. S. and Camerini, P. and Capon, A. A. and and Carena, W. and Carnesecchi, F. and Castillo Castellanos, J. and and Castro, A. J. and Casula, E. A. R. and Ceballos Sanchez, C. and Chandra, and S. and Chang, B. and Chang, W. and Chapeland, S. and Chartier, M. and and Chattopadhyay, S. and Chattopadhyay, S. and Chauvin, A. and Cheshkov, C. and and Cheynis, B. and Chibante Barroso, V. and Chinellato, D. D. and Cho, and S. and Chochula, P. and Chowdhury, T. and Christakoglou, P. and and Christensen, C. H. and Christiansen, P. and Chujo, T. and Chung, S. U. and and Cicalo, C. and Cifarelli, L. and Cindolo, F. and Cleymans, J. and and Colamaria, F. and Colella, D. and Collu, A. and Colocci, M. and Concas, and M. and Conesa Balbastre, G. and Conesa del Valle, Z. and Contreras, J. and G. and Cormier, T. M. and Corrales Morales, Y. and Cortese, P. and and Cosentino, M. R. and Costa, F. and Costanza, S. and Crkovska, J. and and Crochet, P. and Cuautle, E. and Cunqueiro, L. and Dahms, T. and Dainese, and A. and Damas, F. P. A. and Dani, S. and Danisch, M. C. and Danu, A. and and Das, D. and Das, I. and Das, S. and Dash, A. and Dash, S. and De, S. and and De Caro, A. and de Cataldo, G. and de Conti, C. and de Cuveland, J. and and De Falco, A. and De Gruttola, D. and De Marco, N. and De Pasquale, S. and and De Souza, R. D. and Degenhardt, H. F. and Deisting, A. and Deloff, and A. and Delsanto, S. and Deplano, C. and Dhankher, P. and Di Bari, D. and and Di Mauro, A. and Di Ruzza, B. and Diaz, R. A. and Dietel, T. and and Dillenseger, P. and Ding, Y. and Divia, R. and Djuvsland, O. and Dobrin, and A. and Domenicis Gimenez, D. and Doenigus, B. and Dordic, O. and Dubey, and A. K. and Dubla, A. and Ducroux, L. and Dudi, S. and Duggal, A. K. and and Dukhishyam, M. and Dupieux, P. and Ehlers, R. J. and Elia, D. and and Endress, E. and Engel, H. and Epple, E. and Erazmus, B. and Erhardt, F. and and Ersdal, M. 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H. and Yurchenko, V. and and Zaccolo, V. and Zaman, A. and Zampolli, C. and Zanoli, H. J. C. and and Zardoshti, N. and Zarochentsev, A. and Zavada, P. and Zaviyalov, N. and and Zbroszczyk, H. and Zhalov, M. and Zhang, X. and Zhang, Y. and Zhang, Z. and and Zhao, C. and Zherebchevskii, V. and Zhigareva, N. and Zhou, D. and and Zhou, Y. and Zhou, Z. and Zhu, H. and Zhu, J. and Zhu, Y. and Zichichi, and A. and Zimmermann, M. B. and Zinovjev, G. and Zmeskal, J. and The ALICE and collaboration",
    journal = "Journal of High Energy Physics",
    year = "2018",
    number = "10",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP10(2018)139",
    keywords = "Heavy Ion Experiments",
    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-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."
}