Observation of Enhanced Double Parton Scattering in Proton-Lead Collisions at sqrt[s_{NN}]=8.16 TeV.

R Aaij ,H M Wark ,Rafał Dominik Krawczyk ,M Brodski ,N Tuning ,J Maratas ,A Mathad ,F Ferreira Rodrigues ,G Valenti ,L Li ,J J Saborido Silva ,A Obłąkowska-Mucha ,M Firlej ,V Denysenko ,J Mauricio ,S Eidelman ,G Graziani ,M Fontana ,M Tobin ,S Chen ,L Eklund ,L Henry ,А Артамонов ,M J Tilley ,F Redi ,S Petrucci ,V Romanovskiy ,S Luchuk ,T Fiutowski ,A Lai ,M Veltri ,A Merli ,T Halewood-Leagas ,S E Mitchell ,A G Morris ,W Hu ,M John ,D Maisuzenko ,G Andreassi ,M Jeżabek ,J S Butter ,C Betancourt ,P Ibis ,M J Bradley ,F Dordei ,P Koppenburg ,A Seuthe ,J Bhom ,B Khanji ,M D Sokoloff ,Zishuo Yang ,P Ilten ,Y Yang ,F L Souza De Almeida ,P Alvarez Cartelle ,T Shears ,M Hecker ,R J Hunter ,A Gallas Torreira ,A Papanestis ,A Beiter ,Q Fuehring ,V Vagnoni ,B Schmidt ,X Huang ,P Robbe ,A Berezhnoy ,M Cattaneo ,R Calabrese ,S Escher ,A Loi ,V Matiunin ,M Mulder ,S C Haines ,M J Morello ,M Andreotti ,M Karacson ,T J V Bowcock ,R Lefèvre ,D Hynds ,J Ruiz Vidal ,L De Paula ,F Machefert ,M E 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Cholak ,T Blake ,Maik Becker ,M Calvi ,M Gersabeck ,S Neubert ,D P O’hanlon ,S Ponce ,S Taneja ,Jan Langer ,M Mikhasenko ,M Pepe Altarelli ,B R Gruberg Cazon ,J A Boelhauve ,Elisabet Golobardes ,L Shekhtman ,H Schindler ,S Jakobsen ,P M Hamilton ,W Krzemień ,B Delaney ,S Akar ,V Obraztsov ,A Danilina ,D Müller ,В Жуков ,S Eisenhardt ,B K Jashal ,A B Rodrigues ,H F Schreiner ,M Zavertyaev ,E Graverini ,Y Luo ,A Zhelezov ,J J Back ,N Meinert ,A B Morris ,N Harnew ,W Parker ,L Lopes ,D Décamp ,P Perret ,J Fu ,M Chefdeville ,M De Serio ,X Liu ,M Borisyak ,C Weisser ,N S Nolte ,D Popov ,V Jevtic ,Thomas Peter Jones ,S A Bouchiba ,T Szumlak ,M Veronesi ,J Haimberger ,Zhihao Xu ,D Berninghoff ,E Gersabeck ,A Semennikov ,M Kucharczyk ,A Ukleja ,J L Cobbledick ,D Lucchesi ,L Congedo ,U Uwer ,P Pais ,T Latham ,M Zeng ,P Carniti ,Jun Xu ,G Meier ,A Boyer ,G Casse ,S Sellam ,H Pullen ,F Martínez Vidal ,A Ene ,M Cruz Torres ,V Dobishuk ,S Legotin ,S Aiola ,J Walsh ,M Borsato ,C Patrignani ,A Puig 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,James Vincent Mead ,A Usachov ,M Rama ,A Lupato ,H Liu ,T Tekampe ,P Owen ,Y Amhis ,M Fiorini ,N K Watson ,E Smith ,M Clemencic ,K Klimaszewski ,M Shapkin ,V Kudryavtsev ,A Ryzhikov ,N Jurik ,B Małecki ,S Ek-In ,S Esen ,F Fleuret ,A Vitkovskiy ,B Rachwał ,A Rollings ,C Gu ,A Tsaregorodtsev ,C Meaux ,Y Kang ,P Griffith ,I Longstaff ,A Bay ,P A Gorbounov ,P H Hopchev ,E Buchanan ,Ph Charpentier ,B Audurier ,G Coombs ,V Bocci ,Y J Lu ,A Vollhardt ,T Kvaratskheliya ,V Balagura ,M Reboud ,V Lisovskyi ,Zhihong Shen ,K Świentek ,Mara Senghi Soares ,A Inglessi ,J Marks ,A J Chadwick ,K Belous ,N Voropaev ,C T Dean ,V Lukashenko ,K A Zarebski ,P Vincent ,A G Downes ,F Desse ,D Savrina ,E Thomas ,B Batsukh ,G Punzi ,R Schwemmer ,A Chernov ,M Hushchyn ,F Goncalves Abrantes ,A Robert ,X Han ,R A Mohammed ,B Mitreska ,M Mazurek ,D Dutta ,D Websdale ,J Closier ,Ilaria Neri ,T Gaintseva ,R Lane ,G Zunica

doi:10.1103/physrevlett.125.212001

Abstract

A study of prompt charm-hadron pair production in proton-lead collisions at sqrt[s_{NN}]=8.16 TeV is performed using data corresponding to an integrated luminosity of about 30 nb^{-1}, collected with the LHCb experiment. Production cross sections for different pairs of charm hadrons are measured and kinematic correlations between the two charm hadrons are investigated. This is the first measurement of associated production of two charm hadrons in proton-lead collisions. The results confirm the predicted enhancement of double parton scattering production in proton-lead collisions compared to the single parton scattering production.

Highlights

1⁄4 8.16 TeV is performed using data corresponding to an integrated luminosity of about 30 nb−1, collected with the LHCb experiment
The results confirm the predicted enhancement of double parton scattering production in proton-lead collisions compared to the single parton scattering production
The underlying parton densities are described by parton distribution functions (PDFs)

Summary

Introduction

1⁄4 8.16 TeV is performed using data corresponding to an integrated luminosity of about 30 nb−1, collected with the LHCb experiment. Study of prompt charm-hadron pair production in proton-lead collisions at pffiffiffiffiffiffiffi sNN Production cross sections for different pairs of charm hadrons are measured and kinematic correlations between the two charm hadrons are investigated.

Results

Conclusion