{"title":"在120 GeV的p+p和p+d相互作用中测量J/ψ和ψ(2S)的产生","authors":"","doi":"10.1016/j.physletb.2024.139032","DOIUrl":null,"url":null,"abstract":"<div><p>We report the <span><math><mi>p</mi><mo>+</mo><mi>p</mi></math></span> and <span><math><mi>p</mi><mo>+</mo><mi>d</mi></math></span> differential cross sections measured in the SeaQuest experiment for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production at <figure><img></figure> beam energy covering the forward <em>x</em>-Feynman (<span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span>) range of <span><math><mn>0.5</mn><mo><</mo><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub><mo><</mo><mn>0.9</mn></math></span>. The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced from a recent global analysis of proton- and pion-induced charmonium production data. The <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></mrow></msub><mo>/</mo><msub><mrow><mi>σ</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span> cross section ratios are found to increase as <span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> increases, indicating that the <span><math><mi>q</mi><mover><mrow><mi>q</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> annihilation process has larger contributions in the <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production than the <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production. The <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>d</mi></mrow></msub><mo>/</mo><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msub></math></span> cross section ratios are observed to be significantly different for the Drell-Yan process and <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production, reflecting their different production mechanisms. We find that the <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>d</mi></mrow></msub><mo>/</mo><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msub></math></span> ratios for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production at the forward <span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> region are sensitive to the <span><math><mover><mrow><mi>d</mi></mrow><mrow><mo>¯</mo></mrow></mover><mo>/</mo><mover><mrow><mi>u</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> flavor asymmetry of the proton sea, analogous to the Drell-Yan process. The transverse momentum (<span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) distributions for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production are also presented and compared with data collected at higher center-of-mass energies.</p></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"858 ","pages":"Article 139032"},"PeriodicalIF":4.3000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005902/pdfft?md5=256ccf665a79c52019f29fb66fd83fc5&pid=1-s2.0-S0370269324005902-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Measurement of J/ψ and ψ(2S) production in p + p and p + d interactions at 120 GeV\",\"authors\":\"\",\"doi\":\"10.1016/j.physletb.2024.139032\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>We report the <span><math><mi>p</mi><mo>+</mo><mi>p</mi></math></span> and <span><math><mi>p</mi><mo>+</mo><mi>d</mi></math></span> differential cross sections measured in the SeaQuest experiment for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production at <figure><img></figure> beam energy covering the forward <em>x</em>-Feynman (<span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span>) range of <span><math><mn>0.5</mn><mo><</mo><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub><mo><</mo><mn>0.9</mn></math></span>. The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced from a recent global analysis of proton- and pion-induced charmonium production data. The <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></mrow></msub><mo>/</mo><msub><mrow><mi>σ</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span> cross section ratios are found to increase as <span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> increases, indicating that the <span><math><mi>q</mi><mover><mrow><mi>q</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> annihilation process has larger contributions in the <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production than the <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production. The <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>d</mi></mrow></msub><mo>/</mo><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msub></math></span> cross section ratios are observed to be significantly different for the Drell-Yan process and <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production, reflecting their different production mechanisms. We find that the <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>d</mi></mrow></msub><mo>/</mo><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msub></math></span> ratios for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production at the forward <span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> region are sensitive to the <span><math><mover><mrow><mi>d</mi></mrow><mrow><mo>¯</mo></mrow></mover><mo>/</mo><mover><mrow><mi>u</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> flavor asymmetry of the proton sea, analogous to the Drell-Yan process. The transverse momentum (<span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) distributions for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production are also presented and compared with data collected at higher center-of-mass energies.</p></div>\",\"PeriodicalId\":20162,\"journal\":{\"name\":\"Physics Letters B\",\"volume\":\"858 \",\"pages\":\"Article 139032\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2024-09-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S0370269324005902/pdfft?md5=256ccf665a79c52019f29fb66fd83fc5&pid=1-s2.0-S0370269324005902-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics Letters B\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0370269324005902\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics Letters B","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0370269324005902","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
Measurement of J/ψ and ψ(2S) production in p + p and p + d interactions at 120 GeV
We report the and differential cross sections measured in the SeaQuest experiment for and production at beam energy covering the forward x-Feynman () range of . The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced from a recent global analysis of proton- and pion-induced charmonium production data. The cross section ratios are found to increase as increases, indicating that the annihilation process has larger contributions in the production than the production. The cross section ratios are observed to be significantly different for the Drell-Yan process and production, reflecting their different production mechanisms. We find that the ratios for production at the forward region are sensitive to the flavor asymmetry of the proton sea, analogous to the Drell-Yan process. The transverse momentum () distributions for and production are also presented and compared with data collected at higher center-of-mass energies.
期刊介绍:
Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.