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Phys Rev Lett. 2017 Apr 21;118(16):162302. doi: 10.1103/PhysRevLett.118.162302. Epub 2017 Apr 21.

Flow Dominance and Factorization of Transverse Momentum Correlations in Pb-Pb Collisions at the LHC.

Adam J, Adamová D, Aggarwal MM, Aglieri Rinella G, Agnello M, Agrawal N, Ahammed Z, Ahmad S, Ahn SU, Aiola S, Akindinov A, Alam SN, Albuquerque DSD, Aleksandrov D, Alessandro B, Alexandre D, Alfaro Molina R, Alici A, Alkin A, Alme J, Alt T, Altinpinar S, Altsybeev I, Alves Garcia Prado C, An M, Andrei C, Andrews HA, Andronic A, Anguelov V, Anson C, Antičić T, Antinori F, Antonioli P, Anwar R, Aphecetche L, Appelshäuser H, Arcelli S, Arnaldi R, Arnold OW, Arsene IC, Arslandok M, Audurier B, Augustinus A, Averbeck R, Azmi MD, Badalà A, Baek YW, Bagnasco S, Bailhache R, Bala R, Baldisseri A, Baral RC, Barbano AM, Barbera R, Barile F, Barioglio L, Barnaföldi GG, Barnby LS, Barret V, Bartalini P, Barth K, Bartke J, Bartsch E, Basile M, Bastid N, Basu S, Bathen B, Batigne G, Batista Camejo A, Batyunya B, Batzing PC, Bearden IG, Beck H, Bedda C, Behera NK, Belikov I, Bellini F, Bello Martinez H, Bellwied R, Beltran LGE, Belyaev V, Bencedi G, Beole S, Bercuci A, Berdnikov Y, Berenyi D, Bertens RA, Berzano D, Betev L, Bhasin A, Bhat IR, Bhati AK, Bhattacharjee B, Bhom J, Bianchi L, Bianchi N, Bianchin C, Bielčík J, Bielčíková J, Bilandzic A, Biro G, Biswas R, Biswas S, Blair JT, Blau D, Blume C, Bock F, Bogdanov A, Boldizsár L, Bombara M, Bonora M, Book J, Borel H, Borissov A, Borri M, Botta E, Bourjau C, Braun-Munzinger P, Bregant M, Broker TA, Browning TA, Broz M, Brucken EJ, Bruna E, Bruno GE, Budnikov D, Buesching H, Bufalino S, Buhler P, Buitron SAI, Buncic P, Busch O, Buthelezi Z, Butt JB, Buxton JT, Cabala J, Caffarri D, Caines H, Caliva A, Calvo Villar E, Camerini P, Capon AA, Carena F, Carena W, Carnesecchi F, Castillo Castellanos J, Castro AJ, Casula EAR, Ceballos Sanchez C, Cerello P, Cerkala J, Chang B, Chapeland S, Chartier M, Charvet JL, Chattopadhyay S, Chattopadhyay S, Chauvin A, Cherney M, Cheshkov C, Cheynis B, Chibante Barroso V, Chinellato DD, Cho S, Chochula P, Choi K, Chojnacki M, Choudhury S, Christakoglou P, Christensen CH, Christiansen P, Chujo T, 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Abstract

We present the first measurement of the two-particle transverse momentum differential correlation function, P_{2}≡⟨Δp_{T}Δp_{T}⟩/⟨p_{T}⟩^{2}, in Pb-Pb collisions at sqrt[s_{NN}]=2.76  TeV. Results for P_{2} are reported as a function of the relative pseudorapidity (Δη) and azimuthal angle (Δφ) between two particles for different collision centralities. The Δϕ dependence is found to be largely independent of Δη for |Δη|≥0.9. In the 5% most central Pb-Pb collisions, the two-particle transverse momentum correlation function exhibits a clear double-hump structure around Δφ=π (i.e., on the away side), which is not observed in number correlations in the same centrality range, and thus provides an indication of the dominance of triangular flow in this collision centrality. Fourier decompositions of P_{2}, studied as a function of the collision centrality, show that correlations at |Δη|≥0.9 can be well reproduced by a flow ansatz based on the notion that measured transverse momentum correlations are strictly determined by the collective motion of the system.

PMID:
28474923
DOI:
10.1103/PhysRevLett.118.162302
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