Z-boson production in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 8.16 TeV and Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

Author:

,Acharya S.,Adamová D.,Adler A.,Adolfsson J.,Aggarwal M. M.,Aglieri Rinella G.,Agnello M.,Agrawal N.,Ahammed Z.,Ahmad S.,Ahn S. U.,Akbar Z.,Akindinov A.,Al-Turany M.,Alam S. N.,Albuquerque D. S. D.,Aleksandrov D.,Alessandro B.,Alfanda H. M.,Alfaro Molina R.,Ali B.,Ali Y.,Alici A.,Alizadehvandchali N.,Alkin A.,Alme J.,Alt T.,Altenkamper L.,Altsybeev I.,Anaam M. N.,Andrei C.,Andreou D.,Andronic A.,Angeletti M.,Anguelov V.,Anson C.,Antičić T.,Antinori F.,Antonioli P.,Apadula N.,Aphecetche L.,Appelshäuser H.,Arcelli S.,Arnaldi R.,Arratia M.,Arsene I. C.,Arslandok M.,Augustinus A.,Averbeck R.,Aziz S.,Azmi M. D.,Badalà A.,Baek Y. W.,Bagnasco S.,Bai X.,Bailhache R.,Bala R.,Balbino A.,Baldisseri A.,Ball M.,Balouza S.,Banerjee D.,Barbera R.,Barioglio L.,Barnaföldi G. G.,Barnby L. S.,Barret V.,Bartalini P.,Bartels C.,Barth K.,Bartsch E.,Baruffaldi F.,Bastid N.,Basu S.,Batigne G.,Batyunya B.,Bauri D.,Bazo Alba J. L.,Bearden I. G.,Beattie C.,Bedda C.,Behera N. K.,Belikov I.,Bell Hechavarria A. D. C.,Bellini F.,Bellwied R.,Belyaev V.,Bencedi G.,Beole S.,Bercuci A.,Berdnikov Y.,Berdnikova A.,Berenyi D.,Bertens R. A.,Berzano D.,Besoiu M. G.,Betev L.,Bhasin A.,Bhat I. R.,Bhat M. A.,Bhatt H.,Bhattacharjee B.,Bianchi A.,Bianchi L.,Bianchi N.,Bielčík J.,Bielčíková J.,Bilandzic A.,Biro G.,Biswas R.,Biswas S.,Blair J. T.,Blau D.,Blume C.,Boca G.,Bock F.,Bogdanov A.,Boi S.,Bok J.,Boldizsár L.,Bolozdynya A.,Bombara M.,Bonomi G.,Borel H.,Borissov A.,Bossi H.,Botta E.,Bratrud L.,Braun-Munzinger P.,Bregant M.,Broz M.,Bruna E.,Bruno G. E.,Buckland M. D.,Budnikov D.,Buesching H.,Bufalino S.,Bugnon O.,Buhler P.,Buncic P.,Buthelezi Z.,Butt J. B.,Bysiak S. A.,Caffarri D.,Caliva A.,Calvo Villar E.,Camacho J. M. M.,Camacho R. S.,Camerini P.,Canedo F. D. M.,Capon A. A.,Carnesecchi F.,Caron R.,Castillo Castellanos J.,Castro A. J.,Casula E. A. R.,Catalano F.,Ceballos Sanchez C.,Chakraborty P.,Chandra S.,Chang W.,Chapeland S.,Chartier M.,Chattopadhyay S.,Chattopadhyay S.,Chauvin A.,Cheshkov C.,Cheynis B.,Chibante Barroso V.,Chinellato D. D.,Cho S.,Chochula P.,Chowdhury T.,Christakoglou P.,Christensen C. H.,Christiansen P.,Chujo T.,Cicalo C.,Cifarelli L.,Cilladi L. D.,Cindolo F.,Ciupek M. R.,Clai G.,Cleymans J.,Colamaria F.,Colella D.,Collu A.,Colocci M.,Concas M.,Conesa Balbastre G.,Conesa del Valle Z.,Contin G.,Contreras J. G.,Cormier T. M.,Corrales Morales Y.,Cortese P.,Cosentino M. R.,Costa F.,Costanza S.,Crochet P.,Cuautle E.,Cui P.,Cunqueiro L.,Dabrowski D.,Dahms T.,Dainese A.,Damas F. P. A.,Danisch M. C.,Danu A.,Das D.,Das I.,Das P.,Das P.,Das S.,Dash A.,Dash S.,De S.,De Caro A.,de Cataldo G.,de Cuveland J.,De Falco A.,De Gruttola D.,De Marco N.,De Pasquale S.,Deb S.,Degenhardt H. F.,Deja K. R.,Deloff A.,Delsanto S.,Deng W.,Dhankher P.,Di Bari D.,Di Mauro A.,Diaz R. A.,Dietel T.,Dillenseger P.,Ding Y.,Divià R.,Dixit D. 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Abstract

Abstract Measurement of Z-boson production in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ s NN = 8.16 TeV and Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ s NN = 5.02 TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity 4 < ημ< −2.5 and transverse momentum $$ {p}_{\mathrm{T}}^{\mu } $$ p T μ > 20 GeV/c in the laboratory frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass 60 < mμμ< 120 GeV/c2 and rapidity 2.5 <$$ {y}_{\mathrm{cms}}^{\mu \mu} $$ y cms μμ < 4. They are presented as a function of rapidity and, for the Pb-Pb collisions, of centrality as well. The results are compared with theoretical calculations, both with and without nuclear modifications to the Parton Distribution Functions (PDFs). In p-Pb collisions the center-of-mass frame is boosted with respect to the laboratory frame, and the measurements cover the backward (4.46 <$$ {y}_{\mathrm{cms}}^{\mu \mu} $$ y cms μμ < −2.96) and forward (2.03 <$$ {y}_{\mathrm{cms}}^{\mu \mu} $$ y cms μμ < 3.53) rapidity regions. For the p-Pb collisions, the results are consistent within experimental and theoretical uncertainties with calculations that include both free-nucleon and nuclear-modified PDFs. For the Pb-Pb collisions, a 3.4σ deviation is seen in the integrated yield between the data and calculations based on the free-nucleon PDFs, while good agreement is found once nuclear modifications are considered.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

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