dc.contributor.author | ALICE Collaboration | |
dc.date.accessioned | 2024-06-04T10:05:33Z | |
dc.date.available | 2024-06-04T10:05:33Z | |
dc.date.issued | 2024 | |
dc.identifier.citation | ALICE Collaboration. (2024). Photoproduction of K+K− Pairs in Ultraperipheral Collisions. <i>Physical Review Letters</i>, <i>132</i>(22), Article 222303. <a href="https://doi.org/10.1103/physrevlett.132.222303" target="_blank">https://doi.org/10.1103/physrevlett.132.222303</a> | |
dc.identifier.other | CONVID_216063305 | |
dc.identifier.uri | https://jyx.jyu.fi/handle/123456789/95486 | |
dc.description.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. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | |
dc.publisher | American Physical Society (APS) | |
dc.relation.ispartofseries | Physical Review Letters | |
dc.relation.uri | http://dx.doi.org/10.1103/physrevlett.132.222303 | |
dc.rights | CC BY 4.0 | |
dc.subject.other | photon and charged-lepton interactions with hadrons | |
dc.subject.other | photon production | |
dc.subject.other | photon, lepton and quark production | |
dc.title | Photoproduction of K+K− Pairs in Ultraperipheral Collisions | |
dc.type | article | |
dc.identifier.urn | URN:NBN:fi:jyu-202406044247 | |
dc.contributor.laitos | Fysiikan laitos | fi |
dc.contributor.laitos | Department of Physics | en |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | |
dc.type.coar | http://purl.org/coar/resource_type/c_2df8fbb1 | |
dc.description.reviewstatus | peerReviewed | |
dc.relation.issn | 0031-9007 | |
dc.relation.numberinseries | 22 | |
dc.relation.volume | 132 | |
dc.type.version | publishedVersion | |
dc.rights.copyright | © 2024 CERN, for the ALICE Collaboration | |
dc.rights.accesslevel | openAccess | fi |
dc.relation.grantnumber | 346328 | |
dc.relation.grantnumber | 346327 | |
dc.relation.grantnumber | 824093 | |
dc.relation.grantnumber | 824093 | |
dc.relation.projectid | info:eu-repo/grantAgreement/EC/H2020/824093/EU//STRONG-2020 | |
dc.subject.yso | hiukkasfysiikka | |
dc.format.content | fulltext | |
jyx.subject.uri | http://www.yso.fi/onto/yso/p15576 | |
dc.rights.url | https://creativecommons.org/licenses/by/4.0/ | |
dc.relation.doi | 10.1103/physrevlett.132.222303 | |
dc.relation.funder | Research Council of Finland | en |
dc.relation.funder | Research Council of Finland | en |
dc.relation.funder | European Commission | en |
dc.relation.funder | Suomen Akatemia | fi |
dc.relation.funder | Suomen Akatemia | fi |
dc.relation.funder | Euroopan komissio | fi |
jyx.fundingprogram | Centre of Excellence, AoF | en |
jyx.fundingprogram | Centre of Excellence, AoF | en |
jyx.fundingprogram | RIA Research and Innovation Action, H2020 | en |
jyx.fundingprogram | Huippuyksikkörahoitus, SA | fi |
jyx.fundingprogram | Huippuyksikkörahoitus, SA | fi |
jyx.fundingprogram | RIA Research and Innovation Action, H2020 | fi |
jyx.fundinginformation | 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. | |
dc.type.okm | A1 | |