Photoproduction of K+K- Pairs in Ultraperipheral Collisions

(ALICE Collaboration)

doi:10.1103/PhysRevLett.132.222303

Photoproduction of K+K- Pairs in Ultraperipheral Collisions

(ALICE Collaboration)

Relativistic Nuclear Physics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

K+K- pairs may be produced in photonuclear collisions, either from the decays of photoproduced φ(1020) mesons or directly as nonresonant K+K- pairs. Measurements of K+K- photoproduction probe the couplings between the φ(1020) and charged kaons with photons and nuclear targets. The kaon-proton scattering occurs at energies far above those available elsewhere. We present the first measurement of coherent photoproduction of K+K- pairs on lead ions in ultraperipheral collisions using the ALICE detector, including the first investigation of direct K+K- production. There is significant K+K- production at low transverse momentum, consistent with coherent photoproduction on lead targets. In the mass range 1.1<MKK<1.4 GeV/c2 above the φ(1020) resonance, for rapidity |yKK|<0.8 and pT,KK<0.1 GeV/c, the measured coherent photoproduction cross section is dσ/dy=3.37±0.61(stat)±0.15(syst) mb. The center-of-mass energy per nucleon of the photon-nucleus (Pb) system WγPb,n ranges from 33 to 188 GeV, far higher than previous measurements on heavy-nucleus targets. The cross section is larger than expected for φ(1020) photoproduction alone. The mass spectrum is fit to a cocktail consisting of φ(1020) decays, direct K+K- photoproduction, and interference between the two. The confidence regions for the amplitude and relative phase angle for direct K+K- photoproduction are presented.

Original language	English
Article number	222303
Journal	Physical Review Letters
Volume	132
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevLett.132.222303
State	Published - May 31 2024

Funding

The ALICE Collaboration thanks all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centers and the Worldwide LHC Computing Grid (WLCG) Collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL), State Committee of Science and World Federation of Scientists (WFS), Armenia; Austrian Academy of Sciences, Austrian Science Fund (FWF) [grant DOI: 10.55776/M2467-N36], and Nationalstiftung for Forschung, Technologie und Entwicklung, Austria; Ministry of Communications and High Technologies, National Nuclear Research Center, Azerbaijan; Conselho Nacional de Desenvolvimento Cientifico e Tecnolegico (CNPq), Financiadora de Estudos e Projetos (Finep), Fundacao de Amparo Pesquisa do Estado de Sao Paulo (FAPESP), and Universidade Federal do Rio Grande do Sul (UFRGS), Brazil; Bulgarian Ministry of Education and Science, within the National Roadmap for Research Infrastructures 2020-2027 (object CERN), Bulgaria; Ministry of Education of China (MOEC), Ministry of Science and Technology of China (MSTC), and National Natural Science Foundation of China (NSFC), China; Ministry of Science and Education and Croatian Science Foundation, Croatia; Centro de Aplicaciones Tecnolegicas y Desarrollo Nuclear (CEADEN), Cubaenergia, Cuba; Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic; The Danish Council for Independent Research | Natural Sciences, the VILLUM FONDEN, and Danish National Research Foundation (DNRF), Denmark; Helsinki Institute of Physics (HIP), Finland; Commissariat l'Energie Atomique (CEA) and Institut National de Physique Nucleaire et de Physique des Particules (IN2P3) and Centre National de la Recherche Scientifique (CNRS), France; Bundesministerium for Bildung und Forschung (BMBF) and GSI Helmholtzzentrum for Schwerionenforschung GmbH, Germany; General Secretariat for Research and Technology, Ministry of Education, Research and Religions, Greece; National Research, Development and Innovation Office, Hungary; Department of Atomic Energy Government of India (DAE), Department of Science and Technology, Government of India (DST), University Grants Commission, Government of India (UGC), and Council of Scientific and Industrial Research (CSIR), India; National Research and Innovation Agency-BRIN, Indonesia; Istituto Nazionale di Fisica Nucleare (INFN), Italy; Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS) KAKENHI, Japan; Consejo Nacional de Ciencia (CONACYT) y Tecnologia, through Fondo de Cooperacien Internacional en Ciencia y Tecnologia (FONCICYT) and Direccien General de Asuntos del Personal Academico (DGAPA), Mexico; Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; The Research Council of Norway, Norway; Commission on Science and Technology for Sustainable Development in the South (COMSATS), Pakistan; Pontificia Universidad Catelica del Pere, Peru; Ministry of Education and Science, National Science Centre, and WUT ID-UB, Poland; Korea Institute of Science and Technology Information and National Research Foundation of Korea (NRF), Republic of Korea; Ministry of Education and Scientific Research, Institute of Atomic Physics, Ministry of Research and Innovation, and Institute of Atomic Physics and Universitatea Nationala de Stiinta si Tehnologie Politehnica Bucuresti, Romania; Ministry of Education, Science, Research and Sport of the Slovak Republic, Slovakia; National Research Foundation of South Africa, South Africa; Swedish Research Council (VR) and Knut and Alice Wallenberg Foundation (KAW), Sweden; European Organization for Nuclear Research, Switzerland; Suranaree University of Technology (SUT), National Science and Technology Development Agency (NSTDA), and National Science, Research and Innovation Fund (NSRF via PMU-B B05F650021), Thailand; Turkish Energy, Nuclear and Mineral Research Agency (TENMAK), Turkey; National Academy of Sciences of Ukraine, Ukraine; Science and Technology Facilities Council (STFC), United Kingdom; National Science Foundation (NSF) and U.S. Department of Energy, Office of Nuclear Physics (DOE NP), USA. In addition, individual groups or members have received support from: Czech Science Foundation (Grant No. 23-07499S), Czech Republic; European Research Council, Strong 2020-Horizon 2020 (Grants No. 950692 and No. 824093), European Union; ICSC-Centro Nazionale di Ricerca in High Performance Computing, Big Data and Quantum Computing, European Union-NextGenerationEU; and Academy of Finland (Center of Excellence in Quark Matter) (Grants No. 346327 and No. 346328), Finland.

Funders	Funder number
Council of Scientific and Industrial Research, India
State Committee of Science and World Federation
National Research and Innovation Agency-BRIN
Ministry of Communications and High Technologies
Ministry of Education and Science
Department of Atomic Energy, Government of India
National Academy of Sciences of Ukraine
National Science and Technology Development Agency
National Research Foundation of Korea
Villum Fonden
National Science, Research and Innovation Fund
Ministry of Education of the People's Republic of China
Narodowe Centrum Nauki
University Grants Commission
National Science Foundation
Institut National de Physique Nucléaire et de Physique des Particules
Science and Technology Facilities Council
Institute of Atomic Physics and Universitatea Nationala de Stiinta si Tehnologie Politehnica Bucuresti
General Secretariat for Research and Technology, Ministry of Education, Research and Religions
Japan Society for the Promotion of Science
Ministry of Education and Science
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Korea Institute of Science and Technology Information
Knut och Alice Wallenbergs Stiftelse
Ministry of Science and Education and Croatian Science Foundation
Instituto Nazionale di Fisica Nucleare
Austrian Science Fund
Financiadora de Estudos e Projetos
Ontario Ministry of Research and Innovation
Department of Science and Technology, Ministry of Science and Technology, India
Consejo Nacional de Humanidades, Ciencias y Tecnologías
Helsinki Institute of Physics
Norges Forskningsråd
Yerevan Physics Institute
Natur og Univers, Det Frie Forskningsråd
Centre National de la Recherche Scientifique
Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México
Bundesministerium für Bildung und Forschung
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Danmarks Grundforskningsfond
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Czech Republic
Suranaree University of Technology
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
European Commission
GSI Helmholtzzentrum für Schwerionenforschung
U.S. Department of Energy
Fundação de Amparo à Pesquisa do Estado de São Paulo
National Nuclear Research Center
WUT ID-UB
Institutul de Fizică Atomică
Ministry of Science and Technology of the People's Republic of China
Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic
Ministry of Education, Science, Research and Sport
Fondo de Cooperación Internacional en Ciencia y Tecnología
Universidade Federal do Rio Grande do Sul
Österreichischen Akademie der Wissenschaften
Nationalstiftung for Forschung, Technologie und Entwicklung
University Grants Commission, Government of India
National Research Foundation
Ministry of Higher Education and Scientific Research
CERN
Nuclear Physics
Vetenskapsrådet
Ministry of Education, Culture, Sports, Science and Technology
National Natural Science Foundation of China
NSRF	B05F650021
Grantová Agentura České Republiky	23-07499S
Grantová Agentura České Republiky
European Research Council, Strong 2020-Horizon 2020	824093, 950692
Research Council of Finland	346328, 346327
Research Council of Finland

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10.1103/PhysRevLett.132.222303

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@article{2cdb253e84f3406286457f2bce467802,

title = "Photoproduction of K+K- Pairs in Ultraperipheral Collisions",

abstract = "K+K- pairs may be produced in photonuclear collisions, either from the decays of photoproduced φ(1020) mesons or directly as nonresonant K+K- pairs. Measurements of K+K- photoproduction probe the couplings between the φ(1020) and charged kaons with photons and nuclear targets. The kaon-proton scattering occurs at energies far above those available elsewhere. We present the first measurement of coherent photoproduction of K+K- pairs on lead ions in ultraperipheral collisions using the ALICE detector, including the first investigation of direct K+K- production. There is significant K+K- production at low transverse momentum, consistent with coherent photoproduction on lead targets. In the mass range 1.1",

author = "{(ALICE Collaboration)} and S. Acharya and D. Adamov{\'a} and {Aglieri Rinella}, G. and M. Agnello and N. Agrawal and Z. Ahammed and S. Ahmad and Ahn, {S. U.} and I. Ahuja and A. Akindinov and M. Al-Turany and D. Aleksandrov and B. Alessandro and Alfanda, {H. M.} and {Alfaro Molina}, R. and B. Ali and A. Alici and N. Alizadehvandchali and A. Alkin and J. Alme and G. Alocco and T. Alt and Altamura, {A. R.} and I. Altsybeev and Alvarado, {J. R.} and Anaam, {M. N.} and C. Andrei and N. Andreou and A. Andronic and E. Andronov and V. Anguelov and F. Antinori and P. Antonioli and N. Apadula and L. Aphecetche and H. Appelsh{\"a}user and C. Arata and S. Arcelli and M. Aresti and R. Arnaldi and Arneiro, {J. G.M.C.A.} and Arsene, {I. C.} and M. Arslandok and A. Augustinus and R. Averbeck and Azmi, {M. D.} and H. Baba and F. Bock and Read, {K. F.} and Schmidt, {N. V.}",

note = "Publisher Copyright: {\textcopyright} 2024 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by CERN.",

year = "2024",

month = may,

day = "31",

doi = "10.1103/PhysRevLett.132.222303",

language = "English",

volume = "132",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "22",

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TY - JOUR

T1 - Photoproduction of K+K- Pairs in Ultraperipheral Collisions

AU - (ALICE Collaboration)

AU - Acharya, S.

AU - Adamová, D.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, S.

AU - Ahn, S. U.

AU - Ahuja, I.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, B.

AU - Alici, A.

AU - Alizadehvandchali, N.

AU - Alkin, A.

AU - Alme, J.

AU - Alocco, G.

AU - Alt, T.

AU - Altamura, A. R.

AU - Altsybeev, I.

AU - Alvarado, J. R.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andreou, N.

AU - Andronic, A.

AU - Andronov, E.

AU - Anguelov, V.

AU - Antinori, F.

AU - Antonioli, P.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arata, C.

AU - Arcelli, S.

AU - Aresti, M.

AU - Arnaldi, R.

AU - Arneiro, J. G.M.C.A.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Baba, H.

AU - Bock, F.

AU - Read, K. F.

AU - Schmidt, N. V.

N1 - Publisher Copyright: © 2024 CERN, for the ALICE Collaboration. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by CERN.

PY - 2024/5/31

Y1 - 2024/5/31

N2 - K+K- pairs may be produced in photonuclear collisions, either from the decays of photoproduced φ(1020) mesons or directly as nonresonant K+K- pairs. Measurements of K+K- photoproduction probe the couplings between the φ(1020) and charged kaons with photons and nuclear targets. The kaon-proton scattering occurs at energies far above those available elsewhere. We present the first measurement of coherent photoproduction of K+K- pairs on lead ions in ultraperipheral collisions using the ALICE detector, including the first investigation of direct K+K- production. There is significant K+K- production at low transverse momentum, consistent with coherent photoproduction on lead targets. In the mass range 1.1

AB - K+K- pairs may be produced in photonuclear collisions, either from the decays of photoproduced φ(1020) mesons or directly as nonresonant K+K- pairs. Measurements of K+K- photoproduction probe the couplings between the φ(1020) and charged kaons with photons and nuclear targets. The kaon-proton scattering occurs at energies far above those available elsewhere. We present the first measurement of coherent photoproduction of K+K- pairs on lead ions in ultraperipheral collisions using the ALICE detector, including the first investigation of direct K+K- production. There is significant K+K- production at low transverse momentum, consistent with coherent photoproduction on lead targets. In the mass range 1.1

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U2 - 10.1103/PhysRevLett.132.222303

DO - 10.1103/PhysRevLett.132.222303

M3 - Article

AN - SCOPUS:85195059933

SN - 0031-9007

VL - 132

JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

M1 - 222303

ER -

Photoproduction of K+K- Pairs in Ultraperipheral Collisions

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