Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at sqrt{s}=7 TeV

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Ajaltouni,N Bondar,S Filippov,F Ferreira Rodrigues,E Graugés,P Pais ,M Traill,E Gersabeck,T Likhomanenko,A Vorobyev,U Straumann,M Van Veghel,S Amato,D Loh,V Maćko ,V Egorychev,T Skwarnicki,A Rollings,V Renaudin,O G Girard,F Machefert,A Comerma-Montells,P Tsopelas,A Bizzeti,A Bondar,M Tresch,P Mackowiak,L Massacrier ,A Bay,G J Pomery,A Papanestis,P Koppenburg,A Puig Navarro,D Melnychuk,R Nandakumar,R Currie,A Dovbnya,A Crocombe,M Ebert,S Neubert,S Richards,S Kotriakhova,W Barter,J A De Vries,I Nasteva,E Michielin,C R Jones,B Małecki ,S Braun,T Nakada,G Martellotti,M Baalouch,A Ossowska,A Weiden,M Gandelman,M Stepanova,T Blake,J J Saborido Silva,L Carson,Ia Bezshyiko,J Wang,M Jeżabek ,M Straticiuc,D C Craik,Zishuo Yang ,G Passaleva,M Schlupp,B Sciascia,T Verlage ,P E L Clarke,I Gorelov ,M Kelsey,M Calvo Gomez,G Gazzoni,A Heister,M Palutan,R Cenci,K Carvalho Akiba,G Tellarini,I Longstaff,Y Zhang,A Pistone,A Palano,C Marín Benito ,P Alvarez Cartelle,D Websdale,N Kazeev,P Carniti,P 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Walsh,E S Sepulveda,G Wormser,M Dorigo,C Matteuzzi,X R Lyu ,T Lesiak,T Li,L Grillo,Y Xie,R Dzhelyadin,J Arnau Romeu,G Haefeli,K Wyllie,G Wilkinson,M Williams,S Benson,M Vieites Diaz,J Müller,E Price,W Bonivento,C Wallace,M Alexander,B Souza De Paula,R Calladine,E Bowen,M Pappagallo,F Ferrari,T D Nguyen,C Santamarina Ríos ,K A Zarebski,D Gerick,S Bachmann,B Sanmartin Sedes,G Penso,T Schmelzer,A Sergi,D Pinci,I G Bordyuzhin ,V Vagnoni,M Smith,J Serrano,B R Gruberg Cazon,B Quintana,N Skidmore,В Жуков ,M Reboud,Z Huard ,O Grünberg,C Hombach,I Raniuk,M Wilkinson,J Brodzicka,A Lupato,F Baryshnikov,M Rihl,D Brundu,Z Li,A Gallas Torreira,A Dendek,A Beiter,J J Back,O Stenyakin,G Lanfranchi,V V Gligorov,J Yu,U Marconi,G Sarpis,S Barsuk,I T Smith,M Vesterinen,J Fu,P Henrard,D Galli,Yang Gao ,S Coquereau,V Balagura,W Kucewicz,T Kirn,M Hatch,A B Rodrigues,V Batozskaya,L Castillo García ,A Dziurda,L Cojocariu,P.-R Li,A Hicheur,D A Milanés ,D Vieira,A Poluektov,C Khurewathanakul,E Gabriel,G Cowan ,P 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Lucchesi,S Gallorini,R Schwemmer,M Mulder,N Sagidova,B Meadows,S Reichert,M D Sokoloff,J Dalseno,P D’Argent,D R Ward,C Bozzi,L De Paula,S Blusk,B Rachwał ,N Nikitin,T Gys,Ph Charpentier,A Tayduganov,F J P Soler,K Heinicke,A Usachov,M W Majewski,F Lemaître ,T J V Bowcock,P Vázquez Regueiro ,T Mombächer,M Dziewiecki,H.-P Dembinski,C Sánchez Mayordomo ,Ph Ghez,W Funk,J Molina Rodriguez,E Luppi,C Hasse,Yao Yao ,J Garra Ticó ,G Andreassi,C Joram,R Calabrese,F Fleuret,S Borghi,L J Bel,M Frank,D Martínez Santos ,M.-N Minard,J Lefrançois,S Nieswand,F F Wilson,D Berninghoff,M Schmelling,F Alessio,D Fazzini,W Qian,L Beaucourt,L Garrido,S Stahl,R Oldeman,M Chefdeville,A Mauri,A Leflat,C Gaspar,M Gersabeck,C Hadjivasiliou,V Cogoni,A Birnkraut,M John,T Hadavizadeh,N K Watson,J Wishahi,D Ferguson,O Lupton,I Komarov,M Kecke,L L Pappalardo,D Lacarrère ,H M Wark,A Davis,J B Zonneveld,S T’Jampens,F Archilli,M Neuner,M Pikies,K Hennessy,R Le Gac,J Ruiz Vidal,Jinjin He ,M De Serio,C Vacca,P De Simone,D P O’Hanlon,D Hill,S Malde,J E Andrews,J Beddow,G Dujany,M Heß,A Pearce,V Tisserand,N Belloli,G Ciezarek,V Rives Molina,A Piucci,M Schubiger,O Leroy,T Gershon,R Forty,S Maddrell-Mander,B Storaci,A Romero Vidal,M J Tilley,A Carbone,A Gomes,A K Kuonen,M Charles,E Van Herwijnen,M Whitehead,Е Говоркова ,J W Ronayne,S Simone,E Ben-Haim,M Zavertyaev,F Kruse,A Petrolini,V Franco Lima,S Stracka,M Van Beuzekom,M Andreotti,F Lionetto,D Savrina,A Sarti,M Cruz Torres,I Belyaev,T Klimkovich,J Jałocha ,E Gushchin,D Décamp ,P Griffith,M Sirendi,M Ravonel Salzgeber,A Pellegrino,T Boettcher,P Collins,B Hamilton,Y Amhis,P Ruiz Valls,L Federici,R Lindner,S Klaver,A Lusiani,E Furfaro,M Lucio Martínez ,L Pescatore,N Meinert,M Corvo,Xiaoyan Han ,G D Lafferty ,A Jawahery,K Kurek,P Spradlin,Y Li,L Gavardi,F Blanc,E Cogneras,A Zhelezov,K Klimaszewski,A Massafferri,M Vitti,X Zhu,C Gotti,M H Schune ,James Vincent Mead ,M De Cian,M S Rangel,V Bocci,S Sridharan,C Baesso,M Clemencic,N Beliy,M Ferro‐Luzzi ,C Färber,M Santimaria,M Borsato,G Manca,W Wiślicki ,M Rotondo,M Adinolfi,V Shevchenko,S C Haines,H Yin,D M Saunders,S Koliiev,R Silva Coutinho,A Tsaregorodtsev,M Ramos Pernas,D Johnson,A Tully,S Amerio,T Humair,E Thomas,M Boubdir,A Cardini,A Alfonso Albero,E Dall’Occo,T Tekampe,A Dzyuba,R A Fini,W Sutcliffe,A Artamonov,F Maciuc,U Eitschberger,T Britton,T Kvaratskheliya,M Fiorini,M Martinelli,A Mogini,A Venkateswaran,P H Hopchev,R Matev,P M Manning ,B Spaan,J Moroń ,G Auriemma,G Fernández ,B Schmidt,K Belous,V Chobanova,V Lisovskyi,S Ely,P Campana,P Durante,J M Otalora Goicochea,E Khairullin,S Ponce,B G Siddi,A Pastore,Feng Jiang ,R Niet,M Fiore,S Karodia,S Schael,U Uwer,V Bellée ,P Di Nezza,B Adeva,V Gibson,L Anderlini,M Veltri,M Szymański ,M Idzik,J J Velthuis,M Calvi,L Gruber,J A Rodriguez Lopez,P Krokovny,H Pullen,M Pepe Altarelli,F Bedeschi,M Karacson,J P Grabowski,N Farley,G Punzi,V Obraztsov,A Bursche,A Rogozhnikov,M Hecker,S Perazzini,V Romanovskiy,F Ratnikov,A Di Canto,J M Kariuki,M Shapkin,S Cadeddu,L Sun,M Mccann,T Szumlak,Z Máthé ,Y Shcheglov,C J G Onderwater,M Winn,D Moran ,F Teubert,G Raven,R Wallace,E Millard,R Lefèvre,M Borisyak,T Latham,T Evans,C Fitzpatrick,C Langenbruch,K Müller,J Harrison,P Naik,F Meier,G Bencivenni,M J Morello,M Marinangeli,T H Hancock,S T Harnew,P Marino,N Neri,G Mancinelli,L Henry,C Lazzeroni,W Krzemień ,D Müller,E Buchanan,X Liu,S Easo,J Cogan,L M Garcia Martin ,S Kandybei,A Fernández Prieto ,S Ali,H Dijkstra,M Hushchyn,A Vollhardt,T Nikodem,N Harnew,A Satta,D Chamont,O Deschamps,A Merli,M Kolpin,K Dreimanis,Yu Guz,A Mazurov,T Ruf,X Vilasis‐Cardona ,B Jost,E Graverini,F Betti,A Mathad,S Stone,A Nogay,V Volkov,P Billoir,Stefan-Gabriel Chitic ,R Bernet,D C Forshaw,L Sestini,P Ciambrone,G Veneziano,V Placinta,J Albrecht,V Salustino Guimarães ,G Graziani,P J Garsed,S Zucchelli

doi:10.1007/jhep12(2017)025

Abstract

Bose-Einstein correlations of same-sign charged pions, produced in proton-proton collisions at a 7 TeV centre-of-mass energy, are studied using a data sample collected by the LHCb experiment. The signature for Bose-Einstein correlations is observed in the form of an enhancement of pairs of like-sign charged pions with small four-momentum difference squared. The charged-particle multiplicity dependence of the Bose-Einstein correlation parameters describing the correlation strength and the size of the emitting source is investigated, determining both the correlation radius and the chaoticity parameter. The measured correlation radius is found to increase as a function of increasing charged-particle multiplicity, while the chaoticity parameter is seen to decrease.

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