Measurement of Ds\xb1 production asymmetry in pp collisions at sqrt{s}=7 and 8 TeV

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Vincent Mead ,D R Ward,V Romanovskiy,J Cogan,M Atzeni,B Khanji,M Vesterinen,M John,S Stahl,S Klaver,M Clemencic,D Marangotto,P Perret,M Dorigo,K A Zarebski,V Coco,J Wishahi,F Teubert,Z Máthé ,I Gorelov ,H Schindler,M Van Veghel,S Valat,S Schael,N Serra,W C Zhang,V Volkov,F Machefert,D Berninghoff,C D’Ambrosio,D Popov,K Belous,M Traill,X Han,A Tayduganov,J Sun,A Golutvin,C Voß,M J Morello,F J P Soler,C Sánchez Mayordomo ,R Greim,M Santimaria,L Sestini,L De Paula,R Forty,J Closier,A Jawahery,F Baryshnikov,S Koliiev,C Remon Alepuz,E Ben-Haim,C Nguyen-Mau,R A Fini,P Robbe,R Tourinho Jadallah Aoude,A B Rodrigues,T Colombo,F Alessio,D Pereima,J Walsh,I T Smith,P Ibis,P Di Nezza,L Del Buono,O Deschamps,F Lionetto,M Hatch,R Waldi,M Calvi,N Jurik,M Gersabeck,L M Garcia Martin,S Blusk,J Van Tilburg,A Oyanguren,A Fernández Prieto ,B Quintana,S Gambetta,V Vagnoni,S Escher,T Fiutowski,N Bondar,C Khurewathanakul,G Manca,Y Zhang,Vladimir Gligorov ,E Khairullin,A Artamonov,W Kucewicz,T Lesiak,A Vorobyev,A Hicheur,M Pló Casasús ,A Pastore,B Leverington,S Malde,N Neufeld,S Kotriakhova,R J Barlow,J M De Miranda,M Ravonel Salzgeber,W Wiślicki ,K Dreimanis,M Mccann,H V Cliff,D Hill,J Buytaert,A Valassi,G Lanfranchi,D Chamont,V Lisovskyi,C J G Onderwater,B G Siddi,P Koppenburg,M Merk,L Lopes ,C Fitzpatrick,M T Tran,E Aslanides,A Pearce,O Leroy,I Belyaev,S Perazzini,R Lefèvre,T Gershon,M Rama,B Dey,E S Sepulveda,M H Schune,A Lusiani,E Gushchin,F Marinho ,B Adeva,V Egorychev,B Meadows,B Garcia Plana,Feng Jiang ,F Muheim,M Vieites Diaz,L Pescatore,R Ekelhof,S Didenko,A Ukleja,E Price,L Grillo,L Giubega,S Gallorini,M S Rangel,J A Rodriguez Lopez,M Winn,A Usachov,O Steinkamp,C Marín Benito ,A Nogay,M Alexander,B Jost,G Morello,A Mauri,R Lindner,B Pietrzyk,G Auriemma,G Cavallero,S Tolk,F Lemaître ,K Wyllie,A Vollhardt,S Ogilvy,F Ferrari,B Małecki ,Y Amhis,M Borisyak,D Fazzini,А Малинин ,M Mulder,A Danilina,M Corvo,R Jacobsson,A Leflat,M Shapkin,E Dall’Occo,L Carson,M Vernet,A Heister,M Stepanova,T Klimkovich,C Bozzi,M Neuner,J M Otalora Goicochea,Z Huard ,X Liu,L Douglas,M Cruz Torres,D Maisuzenko,O De Aguiar Francisco,A Trisovic,X R Lyu ,A Ustyuzhanin,C Santamarina Ríos ,A Obłąkowska-Mucha ,A Dziurda,P.-R Li,J Beddow,D Müller,N Beliy,J Arnau Romeu,P Naik,C Satriano,M Adinolfi,J Qin,M Poli Lener,A Palano,E Gabriel,C Göbel,S Ponce,V Chobanova,G Graziani,G Lafferty,R Mcnulty,P Billoir,M Kecke,A Tully,J Moroń ,S Roiser,A Birnkraut,S Karodia,T D Nguyen,V Renaudin,R Calabrese,C Weisser,I A Monroy,E Michielin,M De Serio,M Martinelli,D Hutchcroft,V Vorobyev,E Tournefier,A Dendek,A Carbone,C Prouvé ,J Müller,M Marinangeli,L Kravchuk,K Maguire,P Griffith,K Heinicke,V Bellée ,D Melnychuk,V Batozskaya,T Evans,C Langenbruch,M Aldaya Martin ,M Kucharczyk,C Frei,C Joram,A Loi,H M Evans,C T Dean,B Delaney,P Gandini,A Berezhnoy,R Oldeman,J Wang,G Passaleva,Y Zheng,J M Durham,M Schellenberg,E Gersabeck,V Placinta,S Braun,F Bedeschi,G Raven,A Zhelezov,P Collins,M Schmelling,T Ketel,M 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doi:10.1007/jhep08(2018)008

Abstract

The inclusive Ds± production asymmetry is measured in pp collisions collected by the LHCb experiment at centre-of-mass energies of sqrt{s}=7 and 8 TeV. Promptly produced Ds± mesons are used, which decay as Ds± → ϕπ±, with ϕ → K+K−. The measurement is performed in bins of transverse momentum, pT, and rapidity, y, covering the range 2.5 < pT< 25.0 GeV/c and 2.0 < y < 4.5. No kinematic dependence is observed. Evidence of nonzero Ds± production asymmetry is found with a significance of 3.3 standard deviations.

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