Harmonic decomposition of two particle angular correlations in Pb–Pb collisions at √sNN = 2.76 TeV
Articolo
Data di Pubblicazione:
2012
Abstract:
Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb–Pb collisions at √sNN = 2.76 TeV for transverse momenta
0.25 < p(taT) < 15 GeV/c, where p (tT) > p(aT) . The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |η| < 1.0. Distributions in relative azimuth φ ≡ φt − φa are analyzed for |η| ≡ |ηt − ηa| > 0.8, and are referred to as “long-range correlations”. Fourier components Vn ≡ cos(nφ) are extracted from the long-range azimuthal correlation functions. If particle
pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy Vn(p(tT) , p(aT) ) is fully described in terms of single-particle anisotropies vn(pT) as Vn(p(tT), p(aT)) = vn(p(tT)vn(paT). This expectation is tested for 1 ≤ n ≤ 5 by applying a global fit of all
Vn(p(tT), p(aT) to obtain the best values vn{GF}(pT ). It is found that for 2 ≤ n ≤ 5, the fit agrees well with data up to p(aT) ~ 3–4 GeV/c, with a trend of increasing deviation as p(tT) and p(aT) are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25 < pT < 15 GeV/c range using a single vn(pT) curve; such a description is however approximately possible for 2 ≤ n ≤ 5 when p(aT) <4 GeV/c. For the n = 1 harmonic, however, a single v1(pT)
curve is not obtained even within the reduced range p(aT) <4 GeV/c.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
ALICE; correlations
Elenco autori:
K., Aamodta; B., Abelevb; A., Abrahantes Quintanac; D., Adamovád; A. M., Adaree; M. M., Aggarwalf; G., Aglieri Rinellag; A. G., Agocsh; A., Agostinellii; S., Aguilar Salazarj; Z., Ahammedk; N., Ahmadl; A., Ahmad Masoodil; S. U., Ahnm; 1, ; A., Akindinovn; D., Aleksandrovo; B., Alessandrop; R., Alfaro Molinaj; A., Aliciq; 2, ; A., Alkinr; E., Almaráz Aviñaj; J., Almes; T., Altt; V., Altiniu; S., Altinpinara; I., Altsybeevv; C., Andreiw; A., Andronicx; V., Anguelovt; 3, ; J., Anielskiy; T., Antičićz; F., Antinoriaa; P., Antonioliab; L., Aphecetcheac; H., Appelshäuserad; N., Arborae; S., Arcellii; A., Arendad; N., Armestoaf; R., Arnaldip; T., Aronssone; I. C., Arsenex; M., Arslandokad; A., Asryanv; A., Augustinusg; R., Averbeckx; T. C., Awesag; J., Äystöah; M. D., Azmil; M., Bacht; A., Badalàai; Y. W., Baekm; 4, ; R., Bailhachead; R., Balap; R., Baldini Ferroliq; A., Baldisseriaj; A., Balditak; F., Baltasar Dos Santos Pedrosag; J., Bánal; R. C., Baralam; R., Barberaan; F., Barileu; G. G., Barnaföldih; L. S., Barnbyao; V., Barretak; J., Bartkeap; M., Basilei; N., Bastidak; B., Batheny; G., Batigneac; B., Batyunyaaq; C., Baumannad; I. G., Beardenar; H., Beckad; I., Belikovas; F., Bellinii; R., Bellwiedat; E., Belmont Morenoj; Lea, Ramona; I., Berceanuw; A., Bercuciw; Y., Berdnikovav; D., Berenyih; C., Bergmanny; L., Betevg; A., Bhasinaw; A. K., Bhatif; L., Bianchiau; N., Bianchiax; C., Bianchinay; J., Bielčíkaz; J., Bielčíkovád; A., Bilandzicba; E., Biolcatiau; F., Blancobb; F., Blancoat; D., Blauo; C., Blumead; N., Bockbc; A., Bogdanovbd; H., Bøggildar; M., Bogolyubskybe; L., Boldizsárh; M., Bombarabf; C., Bombonatiay; J., Bookad; H., Borelaj; A., Borissovbg; C., Bortolinay; 5, ; S., Bosebh; F., Bossúau; M., Botjeba; S., Böttgerbi; B., Boyerbj; P., Braun Munzingerx; M., Bregantac; T., Breitnerbi; M., Brozbk; R., Brung; E., Brunae; 6, ; G. E., Brunou; D., Budnikovbl; H., Bueschingad; S., Bufalinop; K., Bugaievr; O., Buschbm; Z., Buthelezibn; D., Caffarriay; X., Caibo; H., Cainese; E., Calvo Villarbp; Camerini, Paolo; V., Canoa Romanbr; 7, ; G., Cara Romeoab; F., Carenag; W., Carenag; F., Carminatig; A., Casanova Díazax; M., Caselleg; J., Castillo Castellanosaj; E. A. R., Casulabs; V., Catanescuw; C., Cavicchiolig; J., Cepilaaz; P., Cerellop; B., Changah; S., Chapelandg; J. L., Charvetaj; S., Chattopadhyaybh; S., Chattopadhyayk; M., Cherneybt; C., Cheshkovbu; B., Cheynisbu; E., Chiavassap; V., Chibante Barrosog; D. D., Chinellatobv; P., Chochulag; M., Chojnackibw; P., Christakogloubw; C. H., Christensenar; P., Christiansenbx; T., Chujoby; S. U., Chungbz; C., Cicaloca; L., Cifarellii; 8, ; F., Cindoloab; J., Cleymansbn; F., Coccettiq; J. P., Coffinas; F., Colamariau; D., Colellau; G., Conesa Balbastreae; Z., Conesa del Valleas; 9, ; P., Constantinbm; Contin, Giacomo; J. G., Contrerasbr; T. M., Cormierbg; Y., Corrales Moralesau; I., Cortés Maldonadocb; P., Cortesecc; M. R., Cosentinobv; 10, ; F., Costag; M. E., Cotallobb; P., Crochetak; E., Cruz Alanizj; E., Cuautlecd; L., Cunqueiroax; G. D., Erasmou; A., Daineseaa; H. H., Dalsgaardar; A., Danuce; D., Dasbh; I., Dasbh; K., Dasbh; A., Dashbv; S., Dashp; S., Dek; A., De Azevedo Moregulaax; G. O. V., de Barroscf; A., De Carocg; 11, ; G., de Cataldoch; J., de Cuvelandt; A., De Falcobs; D., De Gruttolacg; N., De Marcop; S., De Pasqualecg; R., de Rooijbw; E., Del Castillo Sanchezg; H., Delagrangeac; A., Deloffci; V., Demanovbl; E., Dénesh; A., Deppmancf; D., Di Bariu; C., Di Gigliou; S., Di Libertocj; A., Di Maurog; P., Di Nezzaax; T., Dietely; R., Diviàg; Ø., Djuvslanda; A., Dobrinbg; T., Dobrowolskici; I., Domínguezcd; B., Dönigusx; O., Dordicck; O., Drigaac; A. K., Dubeyk; L., Ducrouxbu; P., Dupieuxak; A. K., Dutta Majumdarbh; M. R., Dutta Majumdark; D., Eliach; D., Emschermanny; H., Engelbi; H. A., Erdals; B., Espagnonbj; M., Estienneac; S., Esumiby; D., Evansao; G., Eyyubovack; D., Fabrisaa; J., Faivreae; D., Falchierii; A., Fantoniax;
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