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

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Latham,S T Harnew,M Borisyak,S Strokov,S.-G Chitic,C Potterat,B Hamilton,A Grecu,A Vollhardt,D Dutta,C Vázquez Sierra,А Малинин ,T Williams,B Dey,R Cenci,D Gascon,K Belous,A Loi,Q N Xu ,Z Yang,C M Costa Sobral,A C Dos Reis,J Arnau Romeu,V Battista,D Berninghoff,R Calabrese,L L Pappalardo,R Forty,R Lindner,M Borsato,R Bernet,M Schubiger,E Santovetti,P De Simone,N Tuning,E Rodrigues,D P O’Hanlon,F Pisani,Ph Charpentier,P Perret,L J Bel,W Hulsbergen,J V Viana Barbosa,G Passaleva,M Vesterinen,M Reboud,K Dreimanis,R Lefèvre,A A Alves,A Puig Navarro,E Graverini,G Lafferty,A Dziurda,P Collins,P Ibis,A Mcnab,S Ali,F Marinho ,Yu Guz,R Aaij,E S Sepulveda,B Pietrzyk,X R Lyu ,V Volkov,G Manca,V Vorobyev,M Ravonel Salzgeber,M Wilkinson,S Koliiev,B Khanji,T Kvaratskheliya,Y Zhang,S Stracka,Wenbin Qian ,Y Shcheglov,J Albrecht,S Valat,L Minzoni,R Schwemmer,M John,B G Siddi,D Martínez Santos ,L Pescatore,D Galli,D Loh,M Vitti,A Romero Vidal,V Coco,M Stepanova,T Nakada,G Punzi,J Walsh,P Robbe,A 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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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