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

J Adam,B Dönigus,A Badalá ,X Li,Oeystein Djuvsland ,R Orava,A Deisting,T H Lutz,H Poppenborg,Q Shou,J J Gaardhøje,B Hippolyte,M Broz,R P Scharenberg,S R Navarro,L Musa,C Klein-Bösing,R Singaraju,S Parmar,N De Marco,R Arnaldi,V Loginov,P Pillot,Y Melikyan,A Gupta,J F Grosse-Oetringhaus,D B Rana,P Crochet,P Glässel,T Peitzmann,M A Mazzoni,F Barile,A Kuryakin,L Gruber,M Płoskoń ,N Zhigareva,U Westerhoff,O Villalobos Baillie,G Scioli,E García-Solis ,R Hosokawa,G Simatovic,X Ren,A Konevskikh,O Shadura,S Bufalino,G Eulisse,D Varga,G G Fronzé ,F Scarlassara,D Colella,A Batista Camejo,P Camerini,M Planinić ,S Rajput,B Polichtchouk,B A Hess,R Barbera,Dae Sung Hwang ,A Ortiz Velasquez,D A Moreira De Godoy,R Lea,L Aphecetche,B S Nielsen,A Gómez Ramírez ,P Riedler,D Domenicis Gimenez,D Di Bari,M Schmidt,E Stenlund,S Foertsch,M Niculescu,A Pop,F Guber,H Bello Martínez ,C M Mitu,C Gao,J Mareš,T Siemiarczuk,S Esumi,D F Weiser,S Gorbunov,R Majka ,D Mal’Kevich,N Jacazio,F Colamaria,V Ratza,L Cunqueiro,D Voscek,Y Corrales Morales,G Simonetti,S Porteboeuf-Houssais,E Kryshen,S Biswas,E Botta,L Feldkamp,S Cho,I Selyuzhenkov,Z Vilakazi,C Blume,S Yano,P Ganoti,B Windelband,A M Veen,T Hussain,M A S Figueredo,A Masoni,A Margotti,Z Ahammed,M A Lisa,A Festanti,L O D L Pimentel,D Silvermyr,K Garg,T Virgili,D Budnikov,Y Kharlov,Z Yin,A Velure,K Ullaland,K Oyama,X Lopez,C Kobdaj,D Peresunko,D F Lodato,J Book,G Martınez García ,M Ivanov,D W Kim,J M Gronefeld,D M Goméz Coral,Y F Ryabov ,A J Lowe ,W Riegler,A M Kubera,A Di Mauro,P Sett,T J Humanic,G Paić,P Cortese,K F Hetland,C Nattrass,S Muhuri,M G Târzilă ,V Manzari,W J Llope ,A Vasiliev,I Vorobyev,M.c.s Williams ,V Papikyan,K F Read,Daisuke Watanabe ,H Murakami,F Carena,O Dordic,P Bartalini,T Tsuji,A Maire,I Králik,B Paul,I Lakomov,S Jena,P Sahoo,R Tieulent,C D Galvan,G Conesa Balbastre,N K Behera,E Hellbär,J Park,P Luettig,I Cortés Maldonado,E Cuautle,G G Barnaföldi,A Furs,J Margutti,H Natal Da Luz,K Mikhaylov,Y Pestov,E Gładysz-Dziaduś ,S G Weber,A Mischke,A Morsch,F Ng,S Sadovsky,M Suleymanov,B Alessandro,A Rossi,P Kaliňák ,J Kim,V Nikulin,Erin Frances Gauger ,D Elia,C Roy,D R Gangadharan,D Röhrich,M Mukherjee,A Toia,A Utrobicic,A Uras,S Masciocchi,J Zhu,A Vargas,B Sahlmuller,A Feliciello,S B Oh ,P Lévai,G De Cataldo,J Niedziela,A Morreale,A Nedosekin,G Steyn,X Peng,J De Cuveland,O Kovalenko,M Fusco Girard,J Bielčík,A Shabanov,S L La Pointe,B Erazmus,J Butt ,M Gallio,S Pochybová ,A Zichichi,S Aiola,F Antinori,M Arslandok,P Giubellino,M Krzewicki,I Pshenichnov,M Lunardon,J Faivre,J Mercado Pérez,A Khuntia,J Seger ,G Wilk,L Vickovic,L G E Beltran,A Passfeld,M S Islam,I R Bhat,Christoph Mayer ,C Lara,A Herghelegiu,P Gasik,J Hladký ,J W Harris,K Schweda,O Karavichev,H Yokoyama,A K Pandey,M Mohisin Khan,K Røed,H Hillemanns,S Ahmad,H Caines,P Giubilato,J Viinikainen,M Marchisone,P Nomokonov,I Altsybeev,J Vrláková,A R Timmins,V Kučera,A M Gago,S De,U Tabassam,H Helstrup,E López Torres,H Hamagaki,E Kondratyuk,A Grigoryan,T Okubo,S Mahajan,M R An ,D Stocco,M Rodríguez Cahuantzi,M Keil,W Poonsawat,Z Song,Mohammad Tariq ,Y Sekiguchi,B Cheynis,M Vargyas,M Mazzilli,M G Munhoz,M Krivda,K Šafařı́k ,S Lindal,D D Chinellato,R Preghenella,J T Buxton,Irais Bautista Guzman ,M Masera,C Furget,I Stan,S Sambyal,S P Sørensen ,C Garabatos,J C Hamon,F Křížek ,C Jahnke,L Molnár ,E G Ferreiro,P G Kuijer,V Kondratiev,S Lee,B T Rascanu,E Meninno,R Bailhache,P W Stankus ,A Collu,J Wiechuła ,J Lien,F Prino,D Miśkowiec ,K Gulbrandsen,J D Mulligan,C Andrei,M B Zimmermann,J Jadlovsky,J Mitra,S Swain,R Singh,F Bossú ,I G Bearden,M Bombara,M Chartier,E Laudi,P Garg,A Alkin,M Šuljić ,В В Исаков ,R Lietava,A Tikhonov,K M Sielewicz,M Chojnacki,R Schicker,D Finogeev,R Nayak,C Zampolli,A Khatun,A Deloff,A Ohlson,R Nania,S M Mahmood,A Rybicki,I Léon Monźon ,D Sekihata,Г Феофилов ,R Bellwied,R J Ehlers,C De Conti,S Arcelli,T Kim,A Roy,S Das,F Ronchetti,J Kumar,I Belikov,Robert Helmut Münzer ,S Kirsch,D Sarkar,J L Klay,Andreas Michael Mathis ,A S González ,F Noferini,S Dash,M Song,R Vernet,E Endress,Y Berdnikov,S Vigolo,R Cruz Albino,T A Browning,V Zaccolo,A Mamonov,F Bock,D B Piyarathna,K Nayak,D J Kim,B Naik,R Renfordt,L Nellen,R Divià,L Greiner,M Cherney,M Puccio,Y Schütz ,Y J Kwon ,N Sarkar,N Poljak,D Pagano,D Berzano,C Jena,C Terrevoli,N Smirnov,D Rathee,B Wagner,U Fuchs,G Puddu,A I Sheikh,A Zarochentsev,Aditya Nath Mishra ,E Vercellin,J Milošević ,A C Oliveira Da Silva,F Sozzi,D Kim,Mike Henry Petrus Sas ,M Petrovici,F Cindolo,A Baldisseri,L Fabbietti,M Kofarago,T W Snellman,L Oláh ,N Hussain,V Singhal,B K Nandi,D S D Albuquerque,S Yalcin,E Karpechev,G S Pappalardo,Z Buthelezi,S Chattopadhyay,J Eum,C Bourjau,S Bagnasco,H Zhang,E Rogochaya,S Filchagin,J Pospı́šil ,V Pozdniakov,J Onderwaater,F Lehas,B Mohanty,S Senyukov,R Gupta,K Choi,S Evdokimov,P Cerello,Jan Wagner ,E M Fiore,V Vechernin,N Sharma,A Szabó ,A Kolojvari,X Zhang,K Münning,J Figiel,F Herrmann,K Schwarz,Ganesh Jagannath Tambave ,A Vodopyanov,S Siddhanta,S Raha,V Anguelov,В Коваленко ,K Shigaki,A Öskarsson ,J Castillo Castellanos,V Trubnikov,A Nyanin,S Kundu,C Schmidt,S Altinpinar,C Kouzinopoulos,A Rehman,J Nystrand,B Audurier,E Fragiacomo,R Derradi De Souza ,L Malinina,S Lehner,Y Pachmayer,V Muccifora,P Yang,T Drozhzhova,M Weber,J Bielčíková,B Sahoo,S Kiselev,O Vázquez Doce,C Zhao,N Bianchi,M R Cosentino,L Görlich,R Haake,B Chang,J Lehrbach,M Inaba,A Francescon,Alexandre Alarcon Do Passo Suaide ,J Wikne,K Redlich,J Alme,T K Nayak,S Kim,A Augustinus,D Thomas,S Kar,E Perez Lezama,A K Bhati,K L Graham,R Alfaro Molina,C Alves Garcia Prado,C Gargiulo,A Sandoval,E Serradilla,A Sharma,S Basu,A Kravčáková,M Szymański ,M G Poghosyan,L Boldizsár,N A Martin,A Tumkin,J Wilkinson,S De Pasquale,M H Oliver ,L Vinogradov,S Moretto,G Trombetta,P Vande Vyvre,V Samsonov,N Agrawal,D Hatzifotiadou,L Ronflette,A De ,A Rakotozafindrabe,M Martı́nez ,P Jacobs ,M B Jadhav,E Scomparin,M Fasel,F Soramel,K Terasaki,M Mager,N Kondratyeva,A Sevcenco,Anastasia Maria Barbano ,J Norman,M Kowalski,M Meres,S A Iga Buitron ,R Averbeck,P I Loenne,U Kebschull,G Zinovjev,L S Barnby,L Karayan,S Kushpil,R C Lemmon,E Ryabinkin,P Reichelt,S A Khan,V Peskov,Meike Charlotte Danisch ,J Oleniacz,Sushanta Tripathy ,B Di Ruzza,P L.m Podesta-Lerma ,C Pruneau ,E Montes,S Bjelogrlic,M Šefčík,A Castro ,T Sinha,Z Conesa Del Valle,E Spiriti,S Nikolaev,L Betev,J P Wessels,D Blau,Y Mao,T Gunji,A M Whitehead,P Hristov,G Herrera Corral,V Lenti,C H Christensen,R Keidel,A Fantoni,A Villatoro Tello,E Bartsch,M M Mieskolainen,K Lapidus,E A R Casula,C Anson,J W Van Hoorne,F Riggi,M Ippolitov,A Karasu Uysal,А Виноградов ,P Dhankher,J Mušinský ,G Kiss,M A Diaz Corchero,F Carnesecchi,S A Voloshin,C Hadjidakis,F Manso,T Vǎnát ,H Zhu,D Zhou,D Alexandre,L Milano,M Vasileiou,P Chochula,P K Sahu,J Takahashi,I Szarka,P G Jones,P Sarma,M M Aggarwal,R Ilkaev,H J C Zanoli,V Lindenstruth,W H Trzaska,H Borel,C Grigoras,S U Chung,J Van Der Maarel,J H Stiller,T Karavicheva,A Kisiel,R Turrisi,B Kileng,M Basile,B Sitár ,B Batyunya,P Rosnet,T Dahms,D Evans,Justin Thomas Blair ,Dmitry Aleksandrov ,J Ferencei,A K Dubey,M Pikna,Michael Andreas Winn ,R Scott,Sk Noor Alam ,A Dainese,G Bíró ,S Mhlanga,J Saini,Monika Joanna Jakubowska ,L Kumar,K Senosi,F Erhardt,G Tejeda Muñoz,C Ceballos Sànchez ,V Barret,M Lupi,P Závada,L Pinsky,S Raniwala,W Carena,J Cerkala,P Pagano,G Bencédi ,O Pinazza,T Richert,A Tauro,M Irfan,J L Charvet,S Kumar,P Khan,J C C Noris,A Grelli,A Kalweit,S Chapeland,A De Falco,G E Bruno,P Dillenseger,M Vala,P Kurashvili,R Anwar,A Fernández Téllez,M Kopčík ,P González-Zamora,C Petta,M Martinez Pedreira,B Bathen,M Connors ,S K Ghosh,K Suzuki,N Tanaka,Sami Sakari Rasanen ,J Cepila,Martin Andreas Volkl ,I Maldonado Cervantes,P Palni,L A P Moreno,H Pei,J Cabala,C Bedda,B Guerzoni,T Kollegger,A Reshetin,Matthias Richter ,W J Park,R T Jimenez Bustamante,A Maevskaya,J Cleymans,R Guernane,Y Sibiriak,Y Zhang,Raimond Snellings ,H Qvigstad,F Rami,A Dash,N Zardoshti,J H Kang,D Mühlheim,E Bruna,E Nappi,M Bonora,C Cicalò ,S Trogolo,F Bellini,S Nikulin,T Alt,V Yurchenko,L Ramello,A Bhasin,I C Arsene,Guido Alexander Willems ,S Saarinen,S Gotovac,R Nair,A Zimmermann,H Buesching,M Floris,J Porter,C Markert,R Langoy,N Mohammadi,C Suire,C Hughes,V Pacik,A Akindinov,Panagiotis Christakoglou ,V Paticchio,R Grosso,D Das,V Petráček,T A Broker,S Sumowidagdo,Ejiro Naomi Umaka ,K Voloshin,S Jadlovska,Y Zhou,A Mas,A Jusko,M Gagliardi,A Khanzadeev,J Schukraft,D Vranić ,G V Margagliotti,S Choudhury,C Deplano,L K Graczykowski,E Leogrande,L Bianchi,J Putschke,H Kim,M Kim,P C Batzing,M D Azmi,P Antonioli,F Reidt,S Zaporozhets,V Chibante Barroso,C Silvestre,S T Heckel,M Nicassio,U Frankenfeld,J Mazer,E Mudnić ,R Sultanov,J Bartke,G Batigne,Y Watanabe,H Oeschler,P Dupieux,M L Knichel,A Harton,R A Ricci,H Pereira Da Costa,P Christiansen,D Caffarri,M Germain,M Agnello,Rajendra Nath Patra ,J Otwinowski,A Dobrin,V Manko,E Calvo Villar,A Bogdanov,A Rachevski,K Krizkova Gajdosova ,S Balasubramanian,B Bhattacharjee,C Kuhn,D Horak,D De Gruttola,D Adamová,A Szczepankiewicz,G Volpe,S Vergara Limón,J Klein,S Klewin,R Biswas,P Malzacher,S Hayashi,S Grigoryan,A Menchaca‐Rocha ,S Piano,Alexander Kluge ,T Antičić,S Nazarenko,Sidharth Kumar Prasad ,H A Andrews,P Bunčić ,K Ozdemir ,N Zaviyalov,R A Negrao De Oliveira,H P Beck ,E Epple,M Kour,R Rui,R Bala,R Raniwala,A Matyja,C Ristea,P Roy,M Šumbera,S Beolè ,P Strmeň ,I Kisel,C Oppedisano,A Ferretti,M J Kweon,H Engel,M Borri,V Riabov,A K Duggal,R Sahoo,P R Pujahari ,N Bastid,A Bilandzic,R Vértesi,C Cheshkov,M Słupecki ,D Berényi ,G Nooren,G Luparello,Ashok Kumar ,P Ghosh,V Kaplin,N Grion,M Sano,V Chelnokov,D Fabris,M Marquard,H Zbroszczyk,B Teyssier,G Hamar,P Bühler ,William Edward Witt ,V Vislavicius,A Telesca,Mohammad Saleh ,T Sugitate,R C Baral,K Barth,A Shabetai,G Usai ,M Oravec,V Grigoriev,O Busch,E Brücken ,M Wang,M A Janik,S Sadhu,A Caliva,F Meddi,G Koyithatta Meethaleveedu,O Arnold ,S Sahoo,B Srivastava ,A Shangaraev,P H S Y Jayarathna,A Bercuci,A Vauthier,C Klein,R Varma,M Malaev,L Leardini,J Salzwedel,S Li,A R Reolon,B Jacak,P La Rocca,J Zmeskal,T Mishra,I Das,V González ,I K Yoo ,J Bhom,F M Fionda,V Ivanov,S Sakai,A Dubla,J S Kim,H Wang,D L D Keijdener,C Zhang,C Bianchin,A Alici,J Rak,A Borissov,I Sputowska,A Mastroserio,J Song,D Thakur,Y W Baek,J Crkovská,V Punin,G Eyyubova,P Foka,S Fokin,S U Ahn,F Roukoutakis,Trine Spedstad Tveter ,Riccardo Russo ,E Scapparone,R Shahoyan,M U Naru,B Espagnon,Z Zhou,J Pan,Y Miake,A Chauvin,V Grabski,M Bregant,D Hutter,H R Schmidt,H Appelshäuser,A Andronic,A Maŕın ,T Chujo,T M Cormier,T B Skaali,C Lippmann,K Reygers,Victor Jose Gaston Feuillard ,M Colocci,S K Pal,M Zhalov,A G Knospe,Z Zhang,P Gianotti,C J Myers,P Braun‐Munzinger ,L Ducroux,M Tarhini,T Dietel,P Martinengo,A Francisco,C Loizides,A Lardeux,J G Contreras,L Cifarelli,D Røhr ,B Von Haller,J Stachel,A Lattuca,A Danu,P Pareek,M Van Leeuwen,H M Ljunggren,L Lazaridis,I Ravasenga,C Schiaua,G Aglieri Rinella,A Kurepin,C Lagana Fernandes,K Shtejer,P Di Nezza,R A Bertens,F Costa,V Izucheev,J Pluta,V Petrov,A J Rubio Montero,V Belyaev,Ji Eun Lee ,M Sitta,A Zaman,Meenakshi Sharma ,S Murray

doi:10.1007/jhep02(2017)077

Abstract

The W and Z boson production was measured via the muonic decay channel in proton-lead collisions at sqrt{s_{mathrm{NN}}}=5.02 TeV at the Large Hadron Collider with the ALICE detector. The measurement covers backward (−4.46 < ycms < −2.96) and forward (2.03 < ycms < 3.53) rapidity regions, corresponding to Pb-going and p-going directions, respectively. The Z-boson production cross section, with dimuon invariant mass of 60 < mμμ < 120 GeV/c2 and muon transverse momentum (pTμ) larger than 20 GeV/c, is measured. The production cross section and charge asymmetry of muons from W-boson decays with pTμ > 10 GeV/c are determined. The results are compared to theoretical calculations both with and without including the nuclear modification of the parton distribution functions. The W-boson production is also studied as a function of the collision centrality: the cross section of muons from W-boson decays is found to scale with the average number of binary nucleon-nucleon collisions within uncertainties.

Highlights

Background contamination Tracking efficiency Trigger efficiencyTracker/trigger matching Alignment Fμ-trig/Minimum Bias (MB) MB cross section< 1% 4% (p-going) 6% (Pb-going)The measured number of candidates is corrected by the A × evaluated with simulations
The results are compared with NLO and NNLO theoretical calculations both with and without including the nuclear modification of the parton distribution functions
The W-boson cross section and decay lepton charge asymmetry were measured in the muonic decay channel with pμT > 10 GeV/c

Summary

Experimental apparatus and data samples

The ALICE detector is described in detail in [29]. Muons are reconstructed in the muon spectrometer, covering the pseudorapidity range −4 < η < −2.5 in the laboratory frame. The integrated luminosities used in the analysis were computed by estimating the equivalent number of MB events corresponding to the muon-triggered data samples and dividing by the MB cross sections. The latter were measured with Van der Meer scans and amount to 2.12 ± 0.07 b and 2.09 ± 0.07 b for the Pb-going and p-going samples, respectively [31]. The contamination is reduced with decreasing centrality, and is about 3% in the 2–20% event classes in both the p-going and Pb-going data samples These values are taken into account in the systematic uncertainties on the normalisation

Muon selection and Monte Carlo simulations

Z-boson analysis

W-boson analysis

Results

Summary