Collins and Sivers transverse-spin asymmetries in inclusive muoproduction of ρ0 mesons

G D Alexeev ,F Tessarotto,A Kerbizi,O Subrt,D Spülbeck,M Virius,G.K Mallot,A Gridin,G.V Khaustov,D Eremeev,F Krinner,M Mikhasenko,G Mattson,C Riedl,S Gerassimov,M Grüner,A Kveton,S Wallner,A Martin,B Ketzer,W Dünnweber,A Townsend,M Pešková,D Panzieri,D Von Harrach,S Platchkov,M Chiosso,O.P Gavrichtchouk,V Andrieux,F Bradamante,A Guskov,F Gautheron,M Ostrick,S.V Donskov,H Pekeler,C Elia,K Sharko,A Rymbekova,N Doshita,A.M Kotzinian,A Grasso,F Sozzi,V.A Polyakov,V.N Kolosov,S Ishimoto,N Makins,A Thiel,M Gorzellik,S Dasgupta,J Lichtenstadt,L Sinha,N Horikawa,A Maggiora,W Augustyniak,J Barth,R Beck,S Dalla Torre,J Giarra,Y Miyachi,A Cicuttin,A.G Chumakov,A Srnka,A Selyunin,S Paul,C Quintans,A Moretti,C Chatterjee,C Menezes Pires,A Bressan,V.D Samoylenko,P Faccioli,H Fischer,M Grosse Perdekamp,K Kurek,J.F.C.A Veloso,D Ecker,M Zavertyaev,S Sarkar,F Tosello,A.G Olshevsky,C Alice,N Makke,M Hoffmann,V Jary,M Pešek,M Bodlak,M Ziembicki,S Levorato,G Reicherz,W.-D Nowak,M Jandek,I Denisenko,S Huber,C.D.R Azevedo,J Marzec,T Rudnicki,S.A Mamon,J Bernhard,P.-J Lin,J Tomsa,B Grube,V.E Burtsev,S Tessaro,J Nový,B Parsamyan,G Sbrizzai,M Quaresma,J Pochodzalla,A Rychter,M.L Crespo,D Giordano,Yu.V Mikhailov,W Meyer,H Schmieden,A Magnon,K Kondo Horikawa,A Maltsev,A Koval,Y.-S Lian,B.M Veit,A Nagaytsev,A Amoroso,R Joosten,V Tskhay,A Sandacz,E Zemlyanichkina,C.-Y Hsieh,M Faessler,K.J Flöthner,F Kunne,M Finger,E Mitrofanov,Y Bedfer,K Augsten,D.V Peshekhonov,M Stolarski,Ch Dreisbach,I Konorov,T Matsuda,D Neyret,G Nukazuka,E Kabuß,M Zemko,C Naim,A Khatun,Friedrich Jm ,Werner Florian Samayoa ,Daisuke Miura ,K Lavičková ,W C Chang ,Mathias Wagner ,M Slunečka ,R R Dusaev ,Hayato Suzuki ,V V Frolov ,А В Ефремов ,Martin M Meyer ,В.ф Константинов ,D I Ryabchikov ,Bruno Valinoti ,Zdeněk Král ,М Фингер ,Luis G Ordóñez ,О Денисов ,O Kouznetsov ,J H Koivuniemi ,M Šulc ,Riccardo Longo ,S U Chung ,P M M Correia ,Filippo Delcarro ,F Kašpar ,Triloki Pandit ,F.r Metzger ,Tadahisa Iwata ,Bartolomeo Della Ventura ,B Badełek ,I Savin ,Jan Matoušek ,Romina Molina ,А Иванов ,A Korzenev ,M Alexeev ,Ф Клейн ,J C Peng ,R Kurjata ,D D’ago ,В Аносов ,N D’hose ,Valery E Lyubovitskij ,К Заремба

doi:10.1016/j.physletb.2023.137950

Abstract

The production of vector mesons in deep inelastic scattering is an interesting yet scarcely explored channel to study the transverse spin structure of the nucleon and the spin-dependence of fragmentation. The COMPASS collaboration has performed the first measurement of the Collins and Sivers asymmetries for inclusively produced ρ0 mesons. The analysis is based on the data set collected in deep inelastic scattering in 2010 using a 160GeV/cμ+ beam impinging on a transversely polarized NH3 target. The ρ0 mesons are selected from oppositely charged hadron pairs, and the asymmetries are extracted as a function of the Bjorken-x variable, the transverse momentum of the pair and the fraction of the energy z carried by the pair. Indications for positive Collins and Sivers asymmetries are observed.

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