Observation of Multiplicity Dependent Prompt χ_{c1}(3872) and ψ(2S) Production in pp Collisions.

R Aaij ,M Pappagallo ,V Kudryavtsev ,B Batsukh ,R A Fini ,B Audurier ,Q Fuehring ,R Santacesaria ,S Easo ,P Owen ,A Usachov ,S Belin ,Xu Li ,J M Otalora Goicochea ,R Newcombe ,A Bizzeti ,L Witola ,A Pellegrino ,T J V Bowcock ,Hilbrand Steffen Kuindersma ,M Charles ,P Garcia Moreno ,A Jawahery ,S Braun ,C Marín Benito ,L Kravchuk ,J Lomba Castro ,C Bertella ,D Savrina ,T Kirn ,S Popov ,D Websdale ,M Bjørn ,X K Zhou ,M Vieites Diaz ,N K Watson ,J Ruiz Vidal ,T Schmelzer ,P M Hamilton ,X Han ,O Stenyakin ,A Philippov ,Vladimir Gligorov ,M Piccini ,J Bhom ,S Maccolini ,S A Wotton ,N Farley ,S T’jampens ,V Obraztsov ,S Akar ,J M De Miranda ,C L Da Silva ,F Dordei ,M Birch ,T Harrison ,A Inglessi ,M Straticiuc ,J A B Coelho ,J Fu ,E M Niel ,R Forty ,Hangyi Wu ,A Satta ,H Van Hecke ,B Schmidt ,J H Lopes ,Y Yao ,A Carbone ,M J Tilley ,C Parkes ,F Dettori ,D Bobulska ,U Egede ,Y Luo ,М Королев ,C Sanchez Gras ,T Nakada ,W Wiślicki ,C Nguyen-Mau ,A G Downes ,A Boyer ,G J Kunde ,Patrícia Camargo Magalhães ,M.-N Minard ,M Van Beuzekom ,X Li ,S Gromov ,S Aiola ,A Puig Navarro ,M Lucio Martínez ,S Ricciardi ,Andrea Lampis ,H Pullen ,T Nanut ,S Stahl ,J T Borsuk ,M Zdybał ,N Tuning ,A Snoch ,F J P Soler ,M T Tran ,L Douglas ,S Petrucci ,Q Han ,T Ovsiannikova ,S Schael ,M J Bradley ,B Garcia Plana ,O Deschamps ,F C R Bishop ,K R Mattioli ,J D Roth ,F Desse ,J S Butter ,C Betancourt ,P Ibis ,F Reiss ,S Schulte ,Y Wang ,I Nasteva ,Е Говоркова ,J García Pardiñas ,C Gotti ,S Ely ,D Sanchez Gonzalo ,L M Garcia Martin ,S Malde ,M Chrząszcz ,Ying Lü ,E Aslanides ,S Maddrell-Mander ,D Müller ,V Chobanova ,Ao Xu ,F Fleuret ,M Alexander ,K Rinnert ,M Guarise ,A Battig ,P Perret ,G Wilkinson ,S Mariani ,S E Hollitt ,L Shchutska ,D Brundu ,C Burr ,Z Li ,A Romero Vidal ,M Karacson ,A Golutvin ,K E Kim ,C B Van Hulse ,U Uwer ,D Melnychuk ,C J G Onderwater ,A Maevskiy ,T Halewood-Leagas ,W Hu ,K Müller ,K Carvalho Akiba ,Z Ajaltouni ,K Hennessy ,P Billoir ,N Sahoo ,M Patel ,M Bachmayer ,M Whitehead ,G Ciezarek ,А Артамонов ,J D Shupperd ,E Van Herwijnen ,D Gascón ,Q J Xu ,I Longstaff ,Y Zhang ,G Bassi ,A Smetkina ,A Tsaregorodtsev ,M Martinelli ,H.-P Dembinski ,L An ,U Marconi ,F A Garcia Rosales ,W Baldini ,B Pagare ,M O Bettler ,R Lefèvre ,A Ukleja ,M Slater ,P E L Clarke ,A Gioventù ,C Haen ,O De Aguiar Francisco ,T Hadavizadeh ,I Williams ,A Petrov ,F Betti ,P Vincent ,J Cogan ,S Barsuk ,S E Mitchell ,S G Weber ,E Luppi ,M Veltri ,B Meadows ,I Solovyev ,T Fiutowski ,A Bertolin ,A J Chadwick ,S.-G Chitic ,P D’argent ,F Pisani ,O Maev ,M D Sokoloff ,S C Haines ,W Parker ,G Vitali ,James Vincent Mead ,G Pietrzyk ,E Dall’occo ,L Minzoni ,R Oldeman ,I A Monroy ,P Kopciewicz ,Y Li ,A Buonaura ,D Murray ,N V Raab ,A Beiter ,D Gerstel ,S Esen ,P Vázquez Regueiro ,J Baptista De Souza Leite ,J G Smeaton ,M P Blago ,V Bellée ,M Stahl ,L Ferreira Lopes ,M Pló Casasús ,L Shekhtman ,G Bencivenni ,D Y Tou ,J Moroń ,V Duk ,E Thomas ,M Gandelman ,T D Nguyen ,W Krupa ,K Dreimanis ,F Lazzari ,O Lupton ,W Barter ,D S Mitzel ,J Brodzicka ,M S Soares ,M Ferro‐Luzzi ,R E Geertsema ,F Baryshnikov ,C Santamarina Ríos ,J Ryżka ,Olga Madejczyk ,Y Zhou ,K Heijhoff ,P Pais ,S De Capua ,D Berninghoff ,T Gaintseva ,A Berezhnoy ,R J Barlow ,C Abellán Beteta ,A Papanestis ,D Décamp ,R Silva Coutinho ,M Adinolfi ,S Tolk ,M Jeżabek ,L Dufour ,E Graugés ,A Piucci ,M Mulder ,Xiaoyu Zhu ,A Kondybayeva ,P H Hopchev ,A Palano ,M Romero Lamas ,D Saranin ,D H Campora Perez ,Aleksandr Solovev ,A Obłąkowska-Mucha ,A Falabella ,S Stemmle ,O Lantwin ,T Evans ,S Eisenhardt ,J J Saborido Silva ,H C Bernstein ,A Leflat ,G Haefeli ,L Giubega ,O Boente García ,A Kharisova ,S Ponce ,R Ribatti ,M John ,L Del Buono ,W Qian ,E Smith ,A C Dos Reis ,Y Amhis ,P Baladrón Rodríguez ,D Galli ,V Denysenko ,I Shchemerov ,M Rotondo ,Z Wang ,M Schiller ,P Naik ,S Jakobsen ,M S Rangel ,G Punzi ,Ph Charpentier ,К Ившин ,K Prasanth ,V Coco ,V Franco Lima ,Feng Jiang ,R Mcnulty ,S Eidelman ,F Machefert ,S Ek-In ,G Chatzikonstantinidis ,N Neufeld ,C Nunez ,A Hicheur ,P Gandini ,M Bartolini ,X Cid Vidal ,P Robbe ,L A Granado Cardoso ,V Dobishuk ,A G Morris ,J Qin ,S Baker ,J A De Vries ,M W Majewski ,V Vagnoni ,S Celani ,V Gibson ,M Rama ,Angel Fernando Campoverde Quezada ,G Valenti ,J Marks ,P Campana ,D Lucchesi ,N Nikitin ,I Skiba ,J H Rademacker ,M Szymański ,X Vilasis‐Cardona ,R Lane ,M Palutan ,Ming Zeng ,D S Richards ,C Vázquez Sierra ,V Pugatch ,G Corti ,C A Aidala ,A Mcnab ,M Petruzzo ,Z Tang ,M Andreotti ,G Robertson ,S Meloni ,C Fitzpatrick ,R Nandakumar ,V Vorobyev ,D Gerick ,F Teubert ,N Bondar ,L M Greeven ,T Shears ,H Cai ,S Sellam ,M E Stramaglia ,A Pastore ,G Morello ,A Robert ,B Małecki ,M Poliakova ,S Liu ,L Cojocariu ,M Calvo Gomez ,D Popov ,V Romanovskiy ,A Ossowska ,W Hulsbergen ,C Weisser ,M Materok ,F Keizer ,V S Kirsebom ,V Jevtic ,S Chen ,E Franzoso ,Yang Yu ,M Chefdeville ,O Leroy ,M Hecker ,R Le Gac ,T Ruf ,C Langenbruch ,B Leverington ,V Tisserand ,G Graziani ,G Liu ,P Li ,S Vecchi ,C Matteuzzi ,A Oyanguren ,C Pappenheimer ,D Wiedner ,K Świentek ,N Cooke ,T Pajero ,A Semennikov ,R A Mohammed ,A Vollhardt ,J Albrecht ,Di Yang ,I Gorelov ,X Liang ,M Ramos Pernas ,Y Fan ,M Williams ,G Carboni ,A Ustyuzhanin ,F Ferreira Rodrigues ,H Liu ,J Plews ,M Sarpis ,A Loi ,M W Dudek ,C H Murphy ,E Jans ,A M Donohoe ,P Carniti ,D Zuliani ,D Lancierini ,N Harnew ,L Tomassetti ,A Butkevich ,S Bachmann ,S Kotriakhova ,R Wang ,R Mountain ,C Bozzi ,A M Hennequin ,D Manuzzi ,O Schneider ,R Manera Escalero ,B Sciascia ,T Grammatico ,J Pinzino ,M Merk ,R Schwemmer ,L Promberger ,L Dieste Maronas ,L L Gerken ,A Güth ,M Mazurek ,M Kenzie ,G Casse ,G Lafferty ,M Santimaria ,O Yushchenko ,H Yin ,J He ,J Wang ,B Delaney ,B Saitta ,D Ilin ,M Cattaneo ,E Ben-Haim ,G Cavallero ,A Brea Rodríguez ,G J Pomery ,S Zucchelli ,F F Wilson ,M Hushchyn ,M C S Williams ,L G Scantlebury Smead ,I Bediaga ,A Gallas Torreira ,B R Gruberg Cazon ,M Cruz Torres ,P Koppenburg ,G Lanfranchi ,E Gushchin ,M Witek ,H Xing ,S Zhang ,H M Wark ,J Buytaert ,J Fan ,G Alkhazov ,Ekaterina Trifonova ,M Calvi ,Д Деркач ,S Neubert ,P Marino ,Zhiyu Xiang ,S Escher ,P Griffith ,B Fang ,D Zhang ,A S Boldyrev ,V Maćko ,L De Paula ,E Epple ,R Cardinale ,C Sánchez Mayordomo ,M J Morello ,G Loustau ,R Litvinov ,V Placinta ,Y Sun ,P Spradlin ,S Kandybei ,N Meinert ,A Lupato ,M Kecke ,V Belavin ,R Matev ,S A Bouchiba ,K Wyllie ,F Alessio ,S Borghi ,L Calero Diaz ,Yu Guz ,A Ryzhikov ,V Balagura ,N Polukhina ,T Boettcher ,M Borsato ,F Kress ,D Pereima ,J Dalseno ,T Lesiak ,M Morandin ,L Garrido ,D J Unverzagt ,X R Lyu ,Guanghua Gong ,D Xiao ,И Белов ,N Sagidova ,Y Zheng ,S Perazzini ,B Quintana ,M Mukherjee ,S Gambetta ,T Latham ,A Davis ,P Ilten ,Peter Švihra ,B Khanji ,A Sarti ,S Luchuk ,I Kostiuk ,F Fontanelli ,L Bian ,Ilaria Neri ,C Göbel ,Lishuang Ma ,V Egorychev ,A Cardini ,D Johnson ,C T Dean ,Y Gan ,V Lisovskyi ,B G Siddi ,S Legotin ,F Archilli ,P Fernandez Declara ,G Tuci ,M Zavertyaev ,K A Thomson ,G Mancinelli ,L Li ,T Colombo ,M De Serio ,P Krokovny ,J P Grabowski ,R Graciani Diaz ,A Popov ,S Bhasin ,E L Gkougkousis ,T Blake ,O Kot ,H Li ,D Fazzini ,O Steinkamp ,J Serrano ,J M Durham ,A Chernov ,C J Pawley ,S Hansmann-Menzemer ,K M Fischer ,D Martínez Santos ,F Bedeschi ,M Traill ,L L Pappalardo ,Y Gao ,T Kvaratskheliya ,A Mauri ,F Stagni ,G Raven ,M Saur ,J Mauricio ,I Belyaev ,S Nieswand ,J Eschle ,D Hutchcroft ,L Meyer Garcia ,P Mackowiak ,O Zenaiev ,C M Costa Sobral ,J L Cobbledick ,M Idzik ,D Hynds ,M Ferrillo ,E Shmanin ,A Massafferri ,A Bay ,L Zhang ,R J Hunter ,E Graverini ,F Suljik ,S Capelli ,P N Swallow ,P De Simone ,S H Lee ,M Pili ,B Couturier ,A Petrolini ,M Firlej ,S Farry ,K Klimaszewski ,M Brodski ,L Calefice ,S Monteil ,M Frank ,T Maltsev ,A Seuthe ,A Rollings ,D Lacarrère ,S Ferreres Sole ,T Ackernley ,M Schellenberg ,C Giugliano ,S Koliiev ,M Giovannetti ,G H Lovell ,K Gizdov ,A Tully ,N Jurik ,J Hu ,E Santovetti ,A Bursche ,P A Gorbounov ,Jan Langer ,C Chen ,N Voropaev ,G Meier ,F Blanc ,D Strekalina ,P A Günther ,J Walsh ,M Pepe Altarelli ,S Kholodenko ,J Maratas ,M De Cian ,Tongyan Lin ,A Poluektov ,D Marangotto ,A Gomes ,T Ketel ,P Seyfert ,M Clemencic ,C Trippl ,C Gu ,Ia Bezshyiko ,G Panshin ,B Pietrzyk ,J A Rodriguez Lopez ,G Coombs ,J J Back ,V Shevchenko ,S Cholak ,Z Yang ,S Stone ,William L Dean ,J M Basels ,A Venkateswaran ,Thomas Peter Jones ,D R Ward ,I Carli ,M Dziewiecki ,A Lusiani ,S Poslavskii ,Y Kang ,D Hill ,J A Boelhauve ,C R Jones ,L Henry ,A Konoplyannikov ,K Petridis ,B D C Westhenry ,A Dovbnya ,Y Pan ,B Souza De Paula ,F Maciuc ,J Yu ,M Kreps ,D Vieira ,E Rodrigues ,Z Máthé ,Y Xie ,C Meaux ,Ph Ghez ,D J White ,M Vesterinen ,M Tobin ,M Wang ,R Calabrese ,M F Cicala ,Wenqian Huang ,S Kretzschmar ,R Vazquez Gomez ,А Малинин ,Elisabet Golobardes ,L Sestini ,Artur Ishteev ,M Hilton ,L Eklund ,Z Ren ,M Marinangeli ,B K Jashal ,G Frau ,M Reboud ,H Viemann ,M S Rudolph ,H Schindler ,M G Chapman ,W Byczynski ,A Pearce ,I Polyakov ,A Dziurda ,N S Nolte ,D A Milanes ,Resmi P K ,R Currie ,A Camboni ,D Golubkov ,B Mitreska ,R D Moise ,M Atzeni ,C Gaspar ,C D’ambrosio ,D C Craik ,G Wormser ,M Wilkinson ,A Lai ,A Brossa Gonzalo ,K Heinicke ,C Frei ,E Bertholet ,L Mcconnell ,B Adeva ,X Liu ,M Franco Sevilla ,M Féo ,M Schubiger ,C Remon Alepuz ,M Gersabeck ,R Lindner ,W Funk ,C Hasse ,F Redi ,P Stefko ,L Pica ,G Manca ,F Ratnikov ,E Cogneras ,E Maurice ,P Ciambrone ,P Di Nezza ,L Anderlini ,M Smith ,D Torres Machado ,C Satriano ,H Malygina ,H Dijkstra ,W Kucewicz ,N Kazeev ,F L Souza De Almeida ,J Closier ,A Danilina ,A Sergi ,B Spaan ,X Yuan ,M Fontana ,M Mccann ,H Afsharnia ,C A Chavez Barajas ,V Renaudin ,M Xu ,J M Kariuki ,V Lukashenko ,S Bifani ,B Passalacqua ,D A Friday ,L Capriotti ,L E Yeomans ,E Gabriel ,A Mödden ,L Soares Lavra ,Dorothea Vom Bruch ,A Vagner ,S Taneja ,Tamaki Holly Mcgrath ,Jun Xu ,S Cadeddu ,Philipp Roloff ,A B Rodrigues ,A Zhelezov ,В Жуков ,Eva Vilella Figueras ,E Millard ,V Chulikov ,H V Cliff ,W Krzemień ,L Gruber ,H Stevens ,T Mombächer ,G Simi ,A Ene ,Z Xu ,A Bondar ,Liang Sun ,H Sazak ,M Borisyak ,T Szumlak ,R Calladine ,S Filippov ,S Amato ,M Garau ,K Belous ,F Polci ,M Schmelling ,D De Simone ,R Jacobsson ,C Patrignani ,M Hatch ,M Shapkin ,J B Zonneveld ,P Kravchenko ,M Mikhasenko ,P Gironella Gironell ,N Neri ,D P O’hanlon ,A Merli ,E Gersabeck ,A Andreianov ,J Cerasoli ,B Dey ,T H Hancock ,S Klaver ,K Arzymatov ,N Skidmore ,A Fernández Prieto ,O Kitouni ,G Passaleva ,A Alfonso Albero ,R Quagliani ,P Fedin ,M H Schune ,N Valls Canudas ,A Szabelski ,S Blusk ,L R Madhan Mohan ,F Martínez Vidal ,J J Velthuis ,F Muheim ,J F Marchand ,J Heuel ,N Serra ,T Skwarnicki ,G Sarpis ,B Jost ,A Dendek ,A Schopper ,M Veronesi ,A Chubykin ,M S Bieker ,L Congedo ,C J Parkinson ,K De Bruyn ,P Durante ,F Ferrari ,E Spadaro Norella ,D M Shangase ,H Mu ,P Alvarez Cartelle ,Sergio Gómez Fernández ,E Polycarpo ,S Cali ,M Goncerz ,L Grillo ,L Martinazzoli ,M Needham ,P Muzzetto ,Rafał Dominik Krawczyk ,R Waldi ,A Sciubba ,M Fiorini ,P Collins ,A Dzyuba ,S Strokov ,J J Lane ,J Haimberger ,J Sun ,A Casais Vidal ,R I Rabadán Trejo ,A B Morris ,Z Aliouche ,D Pinci ,C Wang ,Maik Becker ,A Mathad ,M Kucharczyk ,M Van Veghel ,R Kopecna ,A Grecu ,S Simone ,S Didenko ,A Contu ,P J Marshall ,M Poli Lener ,E B Shields ,D Dutta ,J C Smallwood ,T Tekampe ,R Bernet ,M Artuso ,B Rachwał ,A Vorobyev ,C Prouvé ,S Playfer ,K A Zarebski ,T Gershon ,D Maisuzenko ,V Matiunin ,T Gys ,X Huang ,A Valassi ,G Martellotti ,J Crkovská ,G Zunica

doi:10.1103/physrevlett.126.092001

Abstract

The production of χ_{c1}(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8TeV, corresponding to an integrated luminosity of 2 fb^{-1}. For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of χ_{c1}(3872) to ψ(2S) cross sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the χ_{c1}(3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the χ_{c1}(3872) state are discussed.

Highlights

In recent years, multiple new resonances containing heavy quarks have been observed that do not fit into the framework of conventional hadrons, see Ref. [1] for a recent review
LHCb has since measured the quantum numbers to be JPC 1⁄4 1þþ [8], which disfavors its assignment as conventional charmonium because no compatible charmonium states with these quantum numbers are expected near the measured mass [9]
As the effects governing heavy quark production and transport through the nucleus are assumed to be similar for states with the same quark content, the mechanism for the suppression of excited states is expected to occur in the late stages of the collision, after the heavy quark pair has hadronized into a final state

Summary

Introduction

Multiple new resonances containing heavy quarks have been observed that do not fit into the framework of conventional hadrons, see Ref. [1] for a recent review. Ψð2SÞ states, fprompt, that are produced promptly at the pp collision vertex as a function of charged particle multiplicity are presented.

Results

Conclusion