Beauty production in pp collisions at [formula omitted] measured via semi-electronic decays

V Vechernin,F Blanco,Carlos A Salgado ,S Sadovsky,M Špaček ,A Zimmermann,A Gupta,C Terrevoli,A Telesca,L D Hanratty ,O Karavichev,J H Stiller ,J Kumar,J Mlynarz,S S Räsänen ,L Massacrier,T Kugathasan,B I Abelev ,E Pereira De Oliveira Filho,Riccardo Russo ,D Aleksandrov,Y Zoccarato,D Thomas,A De Falco,A Dainese,M Mukherjee,F Bock,J P Wessels ,N K Behera ,A Francescon,C M Mitu ,N Bianchi,M A Lisa ,A Bogdanov,D Mühlheim,S Rohni,L Boldizsár,S Yang,R Varma,S Yasnopolskiy,J Viinikainen,B Kim,F Bellini,L Görlich,A Badalá ,J Cleymans,V Ivanov,M A S Figueredo ,R Romita,J Bielčíková,R Preghenella,Sang Un Ahn ,J Milošević ,F Zhou,F V Böhmer ,Y Kwon,V Trubnikov,Alexander Kluge ,D Eschweiler,S Choudhury,A Vyushin,J Seger ,F Scarlassara,M Marquard,A Fantoni,S Raha,M Leoncino,K Gulbrandsen,P Strmeň ,J Thäder,A Karasu Uysal,Z Conesa Del Valle,D Fabris,D Berzano,P Khan,G Batigne,S Kar,A Danu,D Di Bari,V Muccifora,G De Cataldo,V Petráček,A Festanti,J L Charvet ,G Zinovjev,S Chapeland,A Szczepankiewicz,K Shtejer,R T Jimenez Bustamante ,A W Rauf ,D Domenicis Gimenez,P Reichelt,D Evans,S Vergara Limón,P Cortese,P Gianotti,K Mikhaylov,M Zhalov,G Paić,C Zampolli,G E Bruno ,A Kurepin,V Manzari,V Singhal,J Zhu,R Tieulent,B Paul,P Roy,M Basile,V Peskov,J Kamin,H Gulkanyan,T Siemiarczuk,R Scott,S Sakai,Y Pestov,I Garishvili,J Otwinowski,A Morreale,R A Soltz ,D Stocco,D Felea,S Arcelli,R Cruz Albino,D Das,G Stefanek,T Schuster,G M Innocenti ,M Šumbera,T Antičić,R Bellwied,K Schwarz,G Volpe,A Reshetin,A M Gago ,K Røed,Daisuke Watanabe ,C Schmidt,S Evdokimov,J Onderwaater,M A Janik ,R Divià,T K Nayak ,A Zarochentsev,S Basu,A Margotti,K Das,E Mudnić ,P Cerello,T J M Symons ,J Nystrand,D Adamová,D Zhou,H Oeschler,Ø Haaland,J Král ,D Hutter,S Grigoryan,R A Bertens ,J Mitra,T Kim,K Schweda,G Simatovic,C Bianchin,M G Târzilă ,D F Lodato ,D J Kim ,A Rivetti,D Vranić ,G G Barnaföldi ,A Bilandzic,A Mastroserio,C H Christensen ,C Gao,G Shabratova,I Altsybeev,B Espagnon,M Irfan,F Roukoutakis,C Ionita,M Fusco Girard,G Hamar,E Rogochaya,A Okatan,F Cindolo,J Song,M Kowalski,X Sanchez Castro,T M Cormier ,C Bedda,A Nedosekin,E Calvo Villar,F Painke,L Cifarelli,Y Yamaguchi,J Wikne,C Klein-Bösing,S Nazarenko,R Haake,L K Graczykowski ,M K Köhler ,A Uras,C Zach,V Razazi,A Pesci,A Maevskaya,N Smirnov,P Dillenseger,Christoph Mayer ,A Kravčáková,S Kim,L Šándor,J J Gaardhøje ,D D Chinellato ,A Tauro,H A Erdal ,H Zhu,E Nappi,R Averbeck,A K Dubey ,R De Rooij,V Kadyshevskiy,D Finogeev,S Aiola,R Raniwala,E Ryabinkin,A Tarantola Peloni,J Book,R Schicker,V Cătănescu ,E García-Solis ,D Hatzifotiadou,M Song,Y Vinogradov,C Kobdaj,J S Réal ,T A Browning ,A Deloff,M Colocci,I Stan,G Herrera Corral,C Pajares,N Zhigareva,C Petta,P Yang,P Christiansen,I.-K Yoo,M Vasileiou,Z Vilakazi,L Vickovic,C Jena,J Wilkinson,J Takahashi,A Caliva,M Gumbo,G Steyn,O Pinazza,F Meddi,G Viesti,Marco Esposito ,B Bathen,R Guernane,M Sano,F Prino,F Bossú,E Spiriti,M Kim,L Manceau,J W Harris ,G Conesa Balbastre,J Hladký ,J Figiel,Shamik Ghosh ,S Kiselev,I Sputowska,W J Park ,R C Baral ,M Gheata,D Röhrich,P Lévai,Y Berdnikov,M Broz,H Pereira Da Costa,D Berényi ,J D Tapia Takaki ,M Mohisin Khan ,I Ahmed,F Reidt,F Ronchetti,A Tarazona Martinez,R J Ehlers ,J S Kim ,S Gorbunov,P Chochula,E Belmont‐Moreno ,A Hansen,V Kovalenko,G R Lee ,A Dubla,R A Ricci ,M Haiduc,J Bartke,P Sahoo,J Rak,M Malaev,M Kretz,S Kirsch,I Ilkiv,J De Cuveland,J Bhom,P Riedler,S Filchagin,H Müller,G Scioli,M Vala,B Ghidini,P Dupieux,R Majka ,F Carena,A Gómez Ramírez ,I G Bearden ,S Bjelogrlic,R Bala,P I Loenne ,M A Mazzoni ,E Vercellin,A Bhasin,V Papikyan,A K Bhati ,B S Nielsen ,T A Broker ,E López Torres,M Zyzak,A Borissov,S Vallero,X Zhang,S Beolè ,M Arslandok,D Silvermyr,C Pruneau ,V Chibante Barroso,А Виноградов ,C Markert,M Słupecki ,Dae Sung Hwang ,A Agostinelli,S Moretto,P Závada,A Matyja,A Vodopyanov,J Norman,J Gerhard,D Mal’kevich ,S Piano,T Šuša ,C Loizides,G Puddu,H Buesching,P Ghosh,Kristin Fanebust Hetland ,R Shahoyan,A Menchaca‐Rocha ,M Bregant,P Kurashvili,V Samsonov,X Lopez,K Reygers,D Falchieri,P Martinengo,M L Knichel ,E Dénes,A Mischke,A J Rubio Montero ,P M Jacobs ,C Suire,S Muhuri,F Riggi,M G Poghosyan ,Z Buthelezi,P R Pujahari ,C Andrei,M Nicassio,A Collu,C Oppedisano,M Spyropoulou‐Stassinaki ,A Baldisseri,S Lindal,S Pochybová ,J Van Der Maarel,T Dietel,L Bianchi,C Lippmann,A Roy,S Bufalino,K Nayak,K F Read ,M I Martínez ,C Gargiulo,R Dang,S Sharma,M Płoskoń,A Sandoval,I Kisel,I Vorobyev,G Tejeda Muñoz,A Passfeld,S Gotovac,I Kulakov,M Mager,B Wagner,I Cortés Maldonado,S Porteboeuf-Houssais,L Ducroux,J Ferencei,A Mamonov,P K Sahu ,M Petrovici,I Selyuzhenkov,S Murray,K Redlich,A C Oliveira Da Silva ,C Silvestre,C Ceballos Sànchez ,M D Azmi ,E Scapparone,I Aimo,O Dordic,C Nattrass,E Montes,S Kalcher,A Mas,A Harton,K Oyama,C G Yaldo ,P Giubellino,M Vajzer,L S Barnby ,E M Fiore ,W H Trzaska ,M Petriş ,B Srivastava ,A Palmeri,B Kileng,T Breitner,V Manko,D Rathee,E Leogrande,M Veldhoen,S Böttger,G Nooren,J Pluta,D Sarkar,B Sahlmuller,Martin Berger ,R Turrisi,P Jones ,P Luettig,B Vulpescu,G Segato,M Ippolitov,M Ajaz,G V Margagliotti ,L Ramello,C Furget,H Zhang,M Botje,N Hussain,C Cicalò ,S Yano,M Meres,T Peitzmann,M Gagliardi,F Noferini,W Riegler,P Camerini,R Singh,R Gupta,K Voloshin,T Virgili,N Zaviyalov,T E Hilden ,R Lietava,V Punin,W Carena,F Antinori,M Rodríguez Cahuantzi,B A Hess ,B Polichtchouk,E Rocco,A Zichichi,D Budnikov,C Cheshkov,P Pillot,J Klein,U Frankenfeld,R P Scharenberg ,U Fuchs,F Barile,Jan Wagner ,V Belyaev,M Huang,B Potukuchi,J Martin Blanco,A Kisiel,V Kučera,M Bogolyubsky,V Lindenstruth,A De ,Alexandre Alarcon Do Passo Suaide ,B Guerzoni,M Marchisone,A Szabó ,Y Zhou,F Soramel,H Helstrup,R Bailhache,Y Sibiriak,A Batista Camejo,M Steinpreis,M Chojnacki,R Rui,J Alme,M Niculescu,M Petráň ,F Manso,Y Wang,Raimond Snellings ,B Windelband,J Cepila,E Kryshen,M A Tangaro ,J Schukraft,E Stenlund,C Lara,S Parmar,V Barret,N A Martin ,H P Beck ,P Hristov,A Kalweit,P Crochet,D De Gruttola,G L Usai ,E H O Pohjoisaho ,J Lien,A Szanto De Toledo,A N Vasiliev ,Ester Anna Rita Casula ,I Martashvili,V Zaccolo,D R Gangadharan ,D Peresunko,M Agnello,O Busch,S Singha,P H S Y Jayarathna ,M Guilbaud,P Malzacher,H R Schmidt ,A Sevcenco,J Adam,M Heide,L Valencia Palomo,S Foertsch,S L La Pointe ,A Vargas,S Kushpil,N De Marco,T J Humanic ,M Masera,E Cuautle,G Wilk,M J Kweon ,A Alkin,V.-R Loggins ,A Lardeux,R Sultanov,N Poljak,T Tsuji,V Wagner,G S Pappalardo ,S Das,A Maŕın ,D Fehlker,T B Skaali ,H Yang,J Lehnert,I Pshenichnov,C Garabatos,J L Klay ,M Fasel,P Christakoglou,H Caines,J Bielčík,R Arnaldi,B Sitár ,Y Pachmayer,L Feldkamp,J G Contreras ,Ashutosh Dash ,S Bagnasco,K H Khan ,R Langoy,M Lunardon,I R Bhat ,R Reed ,D Miśkowiec,S Hayashi,V Nikulin,P Braun‐Munzinger ,T Alt,J Stachel,D Pant,J Porter,V Grigoriev,D Elia,J Anielski,Martin Schulc ,A R Timmins ,K Skjerdal,N Grion,Y Miake,E Fragiacomo,K Ozdemir ,M B Zimmermann ,G Luparello,L Molnár ,S Chattopadhyay,A Khanzadeev,V Paticchio,C Hadjidakis,L Pinsky,I S Zgura ,B Mohanty,Z Yin,K Ullaland,D A Moreira De Godoy ,G Koyithatta Meethaleveedu,P Bunčić ,L Malinina,L Calero Diaz,H Bøggild,R Vernet,Sk Noor Alam ,X Zhu,S Raniwala,P Nomokonov,A Rehman,J Salzwedel,M Reicher,U Westerhoff,A Kolojvari,S Masciocchi,L Milano,P G Kuijer ,A Rossi,S Sambyal,P Antonioli,N Sharma,B Cheynis,T Kollegger,N Ahmad,J Yi,R Renfordt,A Akindinov,V Anguelov,P Rosnet,S Altinpinar,Y Corrales Morales,M Weber,A Zaman,S T Heckel ,Y Schütz ,S Nikulin,C Blume,D I Patalakha ,M Ivanov,Ø Djuvsland,B S Nilsen ,D Colella,B Alessandro,A Grelli,S Khan ,G D’erasmo ,I Berceanu,T Chujo,B Hippolyte,H Qvigstad,M Krzewicki,A Kuryakin,M Bach,H Borel,H Zbroszczyk,E G Ferreiro ,H Delagrange,A Bercuci,I Lakomov,M Germain,Y Zhang,I E Yushmanov ,U Kebschull,F Baltasar Dos Santos Pedrosa,A Nyanin,S Oh,Michael Andreas Winn ,B Dönigus,S U Chung ,J Oleniacz,D Caffarri,E Scomparin,L Betev,C Zhao,S Fokin,Y P Viyogi ,D W Kim ,S De Pasquale,I C Arsene ,Y Sekiguchi,A Fernández Téllez,S Nikolaev,P Ganoti,J W Van Hoorne ,M Wang,X Cai,I Léon Monźon ,N Bastid,J Putschke,F Křížek ,Martin Andreas Volkl ,S Zaporozhets,V Kondratiev,E Floratos,G Bencédi ,R Keidel,M M Aggarwal ,M Stolpovskiy,C Roy,L Cunqueiro,A G Knospe ,V Chelnokov,F Rettig,F Guber,R Ilkaev,B Batyunya,K Shigaki,R Ma,J H Kang ,C Grigoras,T Sinha,J Vrláková,A K Dutta Majumdar ,A Shabetai,C Søgaard,D Lohner,M Kofarago,D B Piyarathna ,C Alves Garcia Prado,Yongwook Baek ,M Vargyas,H Hartmann,M Sitta,H Engel,L Vinogradov,A Jusko,A Masoni,Y F Ryabov ,V Riabov,P Glässel,H Hamagaki,A Ortiz Velasquez,E Serradilla,M Verweij,S Esumi,F Rodrı́guez ,A Toia,M Wilde,B K Nandi ,B Grinyov,F M Fionda ,S Dash,S A Voloshin ,L Oláh ,A Dobrin,E Karpechev,Z Zhou ,B Von Haller,A Rodriguez Manso,D Blau,D Alexandre,A Lattuca,P Kaliňák ,S Sörensen ,M Bombara,I Králik,R Singaraju,Aditya Nath Mishra ,I Belikov,P González-Zamora,A Konevskikh,C Baumann,B Chang,P Pagano,E Bruna,P Pareek,I Das,A Grigoras,T Gunji,G Kiss,A Rybicki,A Jachołkowski,A Velure,M Gallio,S Di Liberto,A Shangaraev,N Agrawal,A Herghelegiu,L Aphecetche,S Schuchmann,P C Batzing ,T C Awes ,I Szarka,N Kondratyeva,S Dørheim,S M Mahmood ,C Kuhn,A Öskarsson ,F Colamaria,A Ferretti,A Grigoryan,M Planinić ,F Costa,J.j Seo ,D P Mahapatra ,T Sugitate,S Jena,P La Rocca,M Suleymanov,M Venaruzzo,E Botta,A Tumkin,V Loginov,T Richert,J Mareš,M Pachr,J Mazer,M C S Williams ,P Ladrón De Guevara ,Bikash Sinha ,P Foka,H Appelshäuser,C Cavicchioli,B Erazmus,C Lagana Fernandes,R Belmont,C Schiaua,M Van Leeuwen,J Wiechuła ,G Aglieri Rinella,M G Munhoz ,Y Martynov,S Li,R C Lemmon ,B T Rascanu ,A Morsch,S Kox,K Šafařı́k ,Г Феофилов ,I Legrand,L Ronflette,A Pop,M Connors ,H M Ljunggren ,M Krivda,H Jung,C Jahnke,M Estienne,Y Kharlov,R Sahoo,J.-P Revol,L Leardini,Matthias Richter ,N Armesto,A Rakotozafindrabe,O Villalobos Baillie,T Dobrowolski,M Krelina,X.-G Lu,R Nania,M Szymański ,M Morando,A Gheaţă ,Subrata Pal ,M A Diaz Corchero ,J Faivre,D Røhr ,A R Reolon ,S De,A Rachevski,J F Grosse-Oetringhaus ,A Feliciello,G Santagati,E Gładysz-Dziaduś ,P Di Nezza,J Y Grossiord ,Y Kucheriaev,Z Ahammed,T S Tveter ,M Cherney,J Mercado Pérez,A Andronic,M Inaba,L Musa,P L.m Podesta-Lerma ,A Di Mauro,R Lea,B Bhattacharjee,S K Prasad ,A Maire,L Montaño Zetina,R Barbera,M Pikna,J Castillo Castellanos,N Mohammadi,D L D Keijdener ,V Kaplin,P Vande Vyvre,M R Cosentino ,R Grosso,T Pawlak,H J Jang ,T Karavicheva,S Siddhanta,V Lenti,G Martınez García ,T Aronsson,A Alici,J Mušinský ,I Maldonado Cervantes,M Floris,A Augustinus,J Saini

doi:10.1016/j.physletb.2014.09.026

Abstract

The ALICE Collaboration at the LHC reports measurement of the inclusive production cross section of electrons from semi-leptonic decays of beauty hadrons with rapidity |y|<0.8 and transverse momentum 1<pT<10 GeV/c, in pp collisions at s=2.76 TeV. Electrons not originating from semi-electronic decay of beauty hadrons are suppressed using the impact parameter of the corresponding tracks. The production cross section of beauty decay electrons is compared to the result obtained with an alternative method which uses the distribution of the azimuthal angle between heavy-flavour decay electrons and charged hadrons. Perturbative QCD predictions agree with the measured cross section within the experimental and theoretical uncertainties. The integrated visible cross section, σb→e=3.47±0.40(stat)−1.33+1.12(sys)±0.07(norm) μb, was extrapolated to full phase space using Fixed Order plus Next-to-Leading Log (FONLL) calculations to obtain the total bb¯ production cross section, σbb¯=130±15.1(stat)−49.8+42.1(sys)−3.1+3.4(extr)±2.5(norm)±4.4(BR) μb.

Highlights

Perturbative Quantum Chromodynamics calculations of the production of heavy quarks can be carried out with well-controlled accuracy, due to the hard scale imposed by the large mass of heavy quarks [1,2,3]
The large mass implies that heavy quark production in high energy collisions of heavy ions occurs early compared to the formation time of the strongly interacting partonic matter generated in such collisions [4,5,6,7]
Within the statistical and systematic uncertainties the resulting fractions are in agreement with each other and show that the beauty contribution to the total heavy-flavour spectrum is comparable to the contribution from charm for pT > 4 GeV/c

Summary

Introduction

Perturbative Quantum Chromodynamics (pQCD) calculations of the production of heavy (charm and beauty) quarks can be carried out with well-controlled accuracy, due to the hard (high Q 2) scale imposed by the large mass of heavy quarks [1,2,3]. Since both charm and beauty hadrons decay semi-leptonically, the measured distribution of heavy-flavour decay muons and electrons have contributions from both. The objective of the analyses presented here is to obtain the total beauty production cross section by measuring the pT-differential inclusive production cross section of electrons from semi-electronic decays of beauty hadrons. The measured relative beauty contribution to the heavy-flavour decay electrons and the inclusive production cross section of electrons from semi-electronic decays of beauty hadrons are compared to the predictions from three different pQCD calculations (FONLL [1], GM-VFNS [16], and kT-factorization [3]). ALICE Collaboration / Physics Letters B 738 (2014) 97–108 be used along with the measured heavy-flavour electron spectrum to compute the production cross section of electrons from beauty hadron decays

Event and track selection

Impact parameter technique

Azimuthal electron–hadron correlation technique

Results

Summary