Abstract

We report on the high statistics two-pion correlation functions from pp collisions at root s = 0.9 TeV and root s = 7 TeV, measured by the ALICE experiment at the Large Hadron Collider. The correlation functions as well as the extracted source radii scale with event multiplicity and pair momentum. When analyzed in the same multiplicity and pair transverse momentum range, the correlation is similar at the two collision energies. A three-dimensional femtoscopic analysis shows an increase of the emission zone with increasing event multiplicity as well as decreasing homogeneity lengths with increasing transverse momentum. The latter trend gets more pronounced as multiplicity increases. This suggests the development of space-momentum correlations, at least for collisions producing a high multiplicity of particles. We consider these trends in the context of previous femtoscopic studies in high-energy hadron and heavy-ion collisions and discuss possible underlying physics mechanisms. Detailed analysis of the correlation reveals an exponential shape in the outward and longitudinal directions, while the sideward remains a Gaussian. This is interpreted as a result of a significant contribution of strongly decaying resonances to the emission region shape. Significant nonfemtoscopic correlations are observed, and are argued to be the consequence of "mini-jet"-like structures extending to low p(t). They are well reproduced by the Monte-Carlo generators and seen also in pi(+)pi(-) correlations.

Autore Pugliese

• Mastroserio Annalisa

Tutti gli autori

• Aamodt K , Quintana Aa , Adamova D , Adare Am , Aggarwal Mm , Rinella Ga , Agocs Ag , Salazar Sa , Ahammed Z , Ahmad N , Masoodi Aa , Ahn Su , Akindinov A , Aleksandrov D , Alessandro B , Molina Ra , Alici A , Alkin A , Avina Ea , Alt T , Altini V , Altinpinar S , Altsybeev I , Andrei C , Andronic A , Anguelov V , Anson C , Anticic T , Antinori F , Antonioli P , Aphecetche L , Appelshauser H , Arbor N , Arcelli S , Arend A , Armesto N , Arnaldi R , Aronsson T , Arsene Ic , Asryan A , Augustinus A , Averbeck R , Awes Tc , Aysto J , Azmi Md , Bach M , Badala A , Baek Yw , Bagnasco S , Bailhache R , Bala R , Ferroli Rb , Baldisseri A , Baldit A , Ban J , Barbera R , Barile F , Barnafoldi Gg , Barnby Ls , Barret V , Bartke J , Basile M , Bastid N , Bathen B , Batigne G , Batyunya B , Baumann C , Bearden Ig , Beck H , Belikov I , Bellini F , Bellwied R , Belmont Moreno E , Beole S , Berceanu I , Bercuci A , Berdermann E , Berdnikov Y , Betev L , Bhasin A , Bhati Ak , Bianchi L , Bianchi N , Bianchin C , Bielcik J , Bielcikova J , Bilandzic A , Biolcati E , Blanc A , Blanco F , Blanco F , Blau D , Blume C , Boccioli M , Bock N , Bogdanov A , Boggild H , Bogolyubsky M , Boldizsar L , Bombara M , Bombonati C , Book J , Borel H , Bortolin C , Bose S , Bossu F , Botje M , Bottger S , Boyer B , Braun Munzinger P , Bravina L , Bregant M , Breitner T , Broz M , Brun R , Bruna E , Bruno Ge , Budnikov D , Buesching H , Busch O , Buthelezi Z , Caffarri D , Cai X , Caines H , Villar Ec , Camerini P , Roman Vc , Romeo Gc , Carena F , Carena W , Carminati F , Diaz Ac , Caselle M , Castellanos Jc , Catanescu V , Cavicchioli C , Cerello P , Chang B , Chapeland S , Charvet Jl , Chattopadhyay S , Chattopadhyay S , Cherney M , Cheshkov C , Cheynis B , Chiavassa E , Barroso Vc , Chinellato Dd , Chochula P , Chojnacki M , Christakoglou P , Christensen Ch , Christiansen P , Chujo T , Cicalo C , Cifarelli L , Cindolo F , Cleymans J , Coccetti F , Coffin Jp , Coli S , Balbastre Gc , del Valle ZC , Constantin P , Contin G , Contreras Jg , Cormier Tm , Morales Yc , Maldonado Ic , Cortese P , Cosentino Mr , Costa F , Cotallo Me , Crescio E , Crochet P , Cuautle E , Cunqueiro L , D'Erasmo G , Dainese A , Dalsgaard Hh , Danu A , Das D , Das I , Dash A , Dash S , De S , Moregula Ad , de Barros GOV , De Caro A , de Cataldo G , de Cuveland J , De Falco A , De Gruttola D , De Marco N , De Pasquale S , De Remigis R , de Rooij R , Delagrange H , Mercado Yd , Dellacasa G , Deloff A , Demanov V , Denes E , Deppman A , Di Bari D , Di Giglio C , Di Liberto S , Di Mauro A , Di Nezza P , Dietel T , Divia R , Djuvsland O , Dobrin A , Dobrowolski T , Dominguez I , Donigus B , Dordic O , Driga O , Dubey Ak , Ducroux L , Dupieux P , Majumdar Akd , Majumdar Mrd , Elia D , Emschermann D , Engel H , Erdal Ha , Espagnon B , Estienne M , Esumi S , Evans D , Evrard S , Eyyubova G , Fabris D , Faivre J , Falchieri D , Fantoni A , Fasel M , Fearick R , Fedunov A , Fehlker D , Fekete V , Felea D , Feofilov G , Tellez Af , Ferretti A , Ferretti R , Figueredo Mas , Filchagin S , Fini R , Finogeev D , Fionda Fm , Fiore Em , Floris M , Foertsch S , Foka P , Fokin S , Fragiacomo E , Fragkiadakis M , Frankenfeld U , Fuchs U , Furano F , Furget C , Girard Mf , Gaardhoje Jj , Gadrat S , Gagliardi M , Gago A , Gallio M , Ganoti P , Garabatos C , Gemme R , Gerhard J , Germain M , Geuna C , Gheata A , Gheata M , Ghidini B , Ghosh P , Girard Mr , Giraudo G , Giubellino P , Gladysz Dziadus E , Glassel P , Gomez R , Gonzalez Trueba LH , Gonzalez Zamora P , Santos Hg , Gorbunov S , Gotovac S , Grabski V , Graczykowski Lk , Grajcarek R , Grelli A , Grigoras A , Grigoras C , Grigoriev V , Grigoryan A , Grigoryan S , Grinyov B , Grion N , Gros P , Grosse Oetringhaus JF , Grossiord Jy , Grosso R , Guber F , Guernane R , Gutierrez Cg , Guerzoni B , Gulbrandsen K , Gulkanyan H , Gunji T , Gupta A , Gupta R , Gutbrod H , Haaland O , Hadjidakis C , Haiduc M , Hamagaki H , Hamar G , Harris Jw , Hartig M

Titolo volume/Rivista

PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY

Anno di pubblicazione

2011

ISSN

1550-7998

ISBN

Non Disponibile

Numero di citazioni Wos

62

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

59

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile