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M. Agnello; B. Alessandro; T. Alt; S. Arcelli; A. Baldisseri; H. Bello Martinez; V. Belyaev; L. Betev; S. Biswas; D. Blau; P. Camerini; A. A. Capon; B. Cheynis; S. Choudhury; L. Cifarelli; G. Conesa Balbastre; J. Crkovská; I. Das; Ø. Djuvsland; A. K. Duggal; P. Dupieux; H. Engel; L. Feldkamp; A. Feliciello; M. A. S. Figueredo; S. Fokin; K. Garg; L. Görlich; P. Hristov; M. S. Islam; V. Izucheev; N. Jacazio; U. Kebschull; A. Khatun; S. Kirsch; A. G. Knospe; T. Kollegger; V. Kondratiev; M. Konyushikhin; O. Kovalenko; L. Kreis; P. G. Kuijer; S. Kushpil; R. Lietava; M. A. Lisa; A. Margotti; C. Markert; D. L. Mihaylov; E. Montes; S. Moretto; J. D. Mulligan; M. G. Munhoz; H. Murakami; A. Narayan; M. U. Naru; J. Norman; T. Okubo; M. H. Oliver; Y. Pachmayer; G. Paić; D. Peresunko; D. B. Piyarathna; M. Puccio; F. Rami; D. B. Rana; R. Renfordt; K. Reygers; V. Riabov; F. Roukoutakis; A. Rybicki; J. Salzwedel; Y. Schutz; J. E. Seger; P. Sett; N. Sharma; S. Silaeva; M. Sitta; J. Song; D. Stocco; M. M. Storetvedt; M. Suleymanov; S. Swain; G. J. Tambave; M. G. Tarzila; A. Tikhonov; T. Tsuji; R. Turrisi; G. L. Usai; A. M. Veen; A. Velure; I. Vorobyev; D. F. Weiser; E. Willsher; W. E. Witt; J. H. Yoon; H. Zhang; X. Zhang; Z. Zhou; A. Zichichi; ALICE Collaboration
The European physical journal. C, Particles and fields, 03/2019, Volume: 79, Issue: 3Journal Article
Abstract First results on $$\hbox {K}/\pi $$ K/π , $$\hbox {p}/\pi $$ p/π and K/p fluctuations are obtained with the ALICE detector at the CERN LHC as a function of centrality in $$\text{ Pb--Pb }$$ Pb--Pb collisions at $$\sqrt{s_\mathrm{{NN}}} =2.76\hbox { TeV}$$ sNN=2.76TeV . The observable $$\nu _{\mathrm{dyn}}$$ νdyn , which is defined in terms of the moments of particle multiplicity distributions, is used to quantify the magnitude of dynamical fluctuations of relative particle yields and also provides insight into the correlation between particle pairs. This study is based on a novel experimental technique, called the Identity Method, which allows one to measure the moments of multiplicity distributions in case of incomplete particle identification. The results for $$\hbox {p}/\pi $$ p/π show a change of sign in $$\nu _{\mathrm{dyn}}$$ νdyn from positive to negative towards more peripheral collisions. For central collisions, the results follow the smooth trend of the data at lower energies and $$\nu _{\mathrm{dyn}}$$ νdyn exhibits a change in sign for $$\hbox {p}/\pi $$ p/π and K/p.
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