Multiplicity dependence of inclusive J/psi production at midrapidity in pp collisions at root s=13 TeV
S. Acharya,D. Adamova,A. Adler,J. Adolfsson,M. M. Aggarwal,G. Aglieri Rinella,M. Agnello,N. Agrawal,Z. Ahammed,S. Ahmad,S. U. Ahn,A. Akindinov,M. Al-Turany,S. N. Alam,D. S. D. Albuquerque,D. Aleksandrov,B. Alessandro,H. M. Alfanda,R. Alfaro Molina,B. Ali,Y. Ali,A. Alici,A. Alkin,J. Alme,T. Alt,L. Altenkamper,I. Altsybeev,M. N. Anaam,C. Andrei,D. Andreou,H. A. Andrews,A. Andronic,M. Angeletti,V. Anguelov,C. Anson,T. Anticic,F. Antinori,P. Antonioli,R. Anwar,N. Apadula,L. Aphecetche,H. Appelshaeuser,S. Arcelli,R. Arnaldi,M. Arratia,I. C. Arsene,M. Arslandok,A. Augustinus,R. Averbeck,S. Aziz,M. D. Azmi,A. Badala,Y. W. Baek,S. Bagnasco,X. Bai,R. Bailhache,R. Bala,A. Baldisseri,M. Ball,S. Balouza,R. Barbera,L. Barioglio,G. G. Barnafoldi,L. S. Barnby,V. Barret,P. Bartalini,K. Barth,E. Bartsch,F. Baruffaldi,N. Bastid,S. Basu,G. Batigne,B. Batyunya,D. Bauri,J. L. Bazo Alba,I. G. Bearden,C. Bedda,N. K. Behera,I. Belikov,A. D. C. Bell Hechavarria,F. Bellini,R. Bellwied,V. Belyaev,G. Bencedi,S. Beole,A. Bercuci,Y. Berdnikov,D. Berenyi,R. A. Bertens,D. Berzano,M. G. Besoiu,L. Betev,A. Bhasin,I. R. Bhat,M. A. Bhat,H. Bhatt,B. Bhattacharjee,A. Bianchi,L. Bianchi,N. Bianchi,J. Bielcik,J. Bielcikova,A. Bilandzic,G. Biro,R. Biswas,S. Biswas,J. T. Blair,D. Blau,C. Blume,G. Boca,F. Bock,A. Bogdanov,S. Boi,L. Boldizsar,A. Bolozdynya,M. Bombara,G. Bonomi,H. Borel,A. Borissov,H. Bossi,E. Botta,L. Bratrud,P. Braun-Munzinger,M. Bregant,M. Broz,J. Brucken,E. Bruna,G. E. Bruno,M. D. Buckland,D. Budnikov,H. Buesching,S. Bufalino,O. Bugnon,P. Buhler,P. Buncic,Z. Buthelezi,J. B. Butt,J. T. Buxton,S. A. Bysiak,D. Caffarri,A. Caliva,E. Calvo Villar,R. S. Camacho,P. Camerini,A. A. Capon,F. Carnesecchi,R. Caron,J. Castillo Castellanos,A. J. Castro,E. A. R. Casula,F. Catalano,C. Ceballos Sanchez,P. Chakraborty,S. Chandra,W. Chang,S. Chapeland,M. Chartier,S. Chattopadhyay,A. Chauvin,C. Cheshkov,B. Cheynis,V. Chibante Barroso,D. D. Chinellato,S. Cho,P. Chochula,T. Chowdhury,P. Christakoglou,C. H. 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PHYSICS LETTERS B（2020）
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摘要
Measurements of the inclusive J/psi yield as a function of charged-particle pseudorapidity density dN(ch)/d eta in pp collisions at root s = 13 TeV with ALICE at the LHC are reported. The J/psi meson yield is measured at midrapidity (vertical bar y vertical bar < 0.9) in the dielectron channel, for events selected based on the charged-particle multiplicity at midrapidity (vertical bar eta vertical bar < 1) and at forward rapidity (-3.7 < eta < -1.7 and 2.8 < eta < 5.1); both observables are normalized to their corresponding averages in minimum bias events. The increase of the normalized J/psi yield with normalized dN(ch)/d eta is significantly stronger than linear and dependent on the transverse momentum. The data are compared to theoretical predictions, which describe the observed trends well, albeit not always quantitatively. (C) 2020 European Organization for Nuclear Research. Published by Elsevier B.V.
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