Observation of Multiplicity Dependent Prompt χc1 (3872) and ψ (2S) Production in pp Collisions

被引：40

作者：

Aaij, R. ^{[32
]}

Beteta, C. Abellan ^{[50
]}

Ackernley, T. ^{[60
]}

Adeva, B. ^{[46
]}

Adinolfi, M. ^{[54
]}

Afsharnia, H. ^{[9
]}

Aidala, C. A. ^{[68
,86
]}

Aiola, S. ^{[25
]}

Ajaltouni, Z. ^{[9
]}

Akar, S. ^{[65
]}

Albrecht, J. ^{[14
]}

Alessio, F. ^{[48
]}

Alexander, M. ^{[59
]}

Alfonso Albero, A. ^{[45
]}

Aliouche, Z. ^{[62
]}

Alkhazov, G. ^{[38
]}

Cartelle, P. Alvarez ^{[48
]}

Amato, S. ^{[2
]}

Amhis, Y. ^{[11
]}

An, L. ^{[21
]}

Anderlini, L. ^{[21
]}

Andreianov, A. ^{[38
]}

Andreotti, M. ^{[20
]}

Archilli, F. ^{[16
]}

Artamonov, A. ^{[44
]}

Artuso, M. ^{[68
]}

Arzymatov, K. ^{[42
]}

Aslanides, E. ^{[10
]}

Atzeni, M. ^{[50
]}

Audurier, B. ^{[11
]}

Bachmann, S. ^{[16
]}

Bachmayer, M. ^{[49
]}

Back, J. J. ^{[56
]}

Baker, S. ^{[61
]}

Baladron Rodriguez, P. ^{[46
]}

Balagura, V ^{[11
]}

Baldini, W. ^{[20
]}

Leite, J. Baptista ^{[1
]}

Barlow, R. J. ^{[62
]}

Barsuk, S. ^{[11
]}

Barter, W. ^{[61
]}

Bartolini, M. ^{[23
,94
]}

Baryshnikov, F. ^{[38
,81
]}

Basels, J. M. ^{[13
]}

Bassi, G. ^{[29
]}

Batsukh, B. ^{[68
]}

Battig, A. ^{[14
]}

Bay, A. ^{[49
]}

Becker, M. ^{[14
]}

Bedeschi, F. ^{[29
]}

机构：

[1] Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil

[2] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil

[3] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China

[4] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China

[5] Univ Chinese Acad Sci, Beijing, Peoples R China

[6] Inst High Energy Phys IHEP, Beijing, Peoples R China

[7] Cent China Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China

[8] Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IN2P3,LAPP, Annecy, France

[9] Univ Clermont Auvergne, LPC, IN2P3, CNRS, Clermont Ferrand, France

[10] Aix Marseille Univ, CPPM, IN2P3, CNRS, Marseille, France

[11] Univ Paris Saclay, IJCLab, IN2P3, CNRS, Orsay, France

[12] Sorbonne Univ, IN2P3, CNRS, Paris Diderot Sorbonne Paris Cite,LPNHE, Paris, France

[13] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany

[14] Tech Univ Dortmund, Fak Phys, Dortmund, Germany

[15] Max Planck Inst Kernphys MPIK, Heidelberg, Germany

[16] Heidelberg Univ, Phys Inst, Heidelberg, Germany

[17] Univ Coll Dublin, Sch Phys, Dublin, Ireland

[18] Ist Nazl Fis Nucl, Sez Bari, Bari, Italy

[19] Ist Nazl Fis Nucl, Sez Bologna, Bologna, Italy

[20] Ist Nazl Fis Nucl, Sez Ferrara, Ferrara, Italy

[21] Ist Nazl Fis Nucl, Sez Firenze, Florence, Italy

[22] Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy

[23] Ist Nazl Fis Nucl, Sez Genova, Genoa, Italy

[24] Ist Nazl Fis Nucl, Sez Milano Bicocca, Milan, Italy

[25] Ist Nazl Fis Nucl, Sez Milano, Milan, Italy

[26] Ist Nazl Fis Nucl, Sez Cagliari, Monserrato, Italy

[27] Univ Padua, Padua, Italy

[28] Ist Nazl Fis Nucl, Padua, Italy

[29] Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy

[30] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy

[31] Ist Nazl Fis Nucl, Sez Roma La Sapienza, Rome, Italy

[32] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands

[33] Vrije Univ Amsterdam, Amsterdam, Netherlands

[34] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Krakow, Poland

[35] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland

[36] Natl Ctr Nucl Res NCBJ, Warsaw, Poland

[37] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania

[38] NRC Kurchatov Inst PNPI NRC KI, Petersburg Nucl Phys Inst, Gatchina, Russia

[39] NRC Kurchatov Inst ITEP NRC KI, Inst Theoret & Expt Phys, Moscow, Russia

[40] Moscow State Univ SINP MSU, Inst Nucl Phys, Moscow, Russia

[41] Russian Acad Sci INR RAS, Inst Nucl Res, Moscow, Russia

[42] Yandex Sch Data Anal, Moscow, Russia

[43] Budker Inst Nucl Phys SB RAS, Novosibirsk, Russia

[44] NRC Kurchatov Inst IHEP NRC KI, Inst High Energy Phys, Protvino, Russia

[45] Univ Barcelona, ICCUB, Barcelona, Spain

[46] Univ Santiago de Compostela, Insto Galego Fis Altas Enerxias IGFAE, Santiago De Compostela, Spain

[47] Ctr Mixto Univ Valencia CSIC, Inst Fis Corpuscular, Valencia, Spain

[48] European Org Nucl Res CERN, Geneva, Switzerland

[49] Ecole Polytech Fed Lausanne EPFL, Inst Phys, Lausanne, Switzerland

[50] Univ Zurich, Phys Inst, Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2021年 / 126卷 / 09期

关键词：

PROTON-NUCLEUS COLLISIONS; SUPPRESSION; J/PSI; X(3872); HEAVY; EVENTS;

D O I：

10.1103/PhysRevLett.126.092001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The production of chi(c1)(3872) and psi(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, 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 chi(c1) (3872) to psi(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 chi(c1) (3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the chi(c1)(3872) state are discussed.

引用

页数：11

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