{"title":"Squeezing effect on D+∕D− with nonzero chemical potential","authors":"Hong-Jie Yin, Jia-Hui Feng, Yong Zhang","doi":"10.1142/s0217732324500421","DOIUrl":null,"url":null,"abstract":"<p>The medium mass modification may lead to a squeezing effect. In the baryonic medium, the mass of <i>D</i> meson was expected to reduce and the in-medium masses of <span><math altimg=\"eq-00003.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span><span></span> and <span><math altimg=\"eq-00004.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span><span></span> may show a splitting effect, and the chemical potential of <i>D</i> meson may be not zero. We study the squeezing effect on the yield ratio <span><math altimg=\"eq-00005.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy=\"false\">∕</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span><span></span> with nonzero chemical potential. Due to the in-medium mass splitting, the squeezing effect on the momentum distributions of <span><math altimg=\"eq-00006.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span><span></span> and <span><math altimg=\"eq-00007.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span><span></span> are different. Without the squeezing effect, the yield ratio <span><math altimg=\"eq-00008.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy=\"false\">∕</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span><span></span> remains constant as the transverse momentum increases. The yield ratio <span><math altimg=\"eq-00009.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy=\"false\">∕</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span><span></span> is affected by the squeezing effect, resulting in a dependence on transverse momentum. An increase in transverse momentum leads to a decrease in the yield ratio, especially when there is a high chemical potential. Additionally, the in-medium mass splitting amplifies this phenomenon. The yield ratio <span><math altimg=\"eq-00010.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy=\"false\">∕</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span><span></span> with nonzero chemical potential approaches 1 when there is a large average in-medium mass reduction, which becomes more evident at higher transverse momentum. The study of the squeezing effect on the yield ratio <span><math altimg=\"eq-00011.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy=\"false\">∕</mo><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span><span></span> with nonzero chemical potential may be meaningful for the CBM and PANDA experiments of the FAIR project at GSI.</p>","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":null,"pages":null},"PeriodicalIF":1.5000,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Modern Physics Letters A","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1142/s0217732324500421","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
The medium mass modification may lead to a squeezing effect. In the baryonic medium, the mass of D meson was expected to reduce and the in-medium masses of and may show a splitting effect, and the chemical potential of D meson may be not zero. We study the squeezing effect on the yield ratio with nonzero chemical potential. Due to the in-medium mass splitting, the squeezing effect on the momentum distributions of and are different. Without the squeezing effect, the yield ratio remains constant as the transverse momentum increases. The yield ratio is affected by the squeezing effect, resulting in a dependence on transverse momentum. An increase in transverse momentum leads to a decrease in the yield ratio, especially when there is a high chemical potential. Additionally, the in-medium mass splitting amplifies this phenomenon. The yield ratio with nonzero chemical potential approaches 1 when there is a large average in-medium mass reduction, which becomes more evident at higher transverse momentum. The study of the squeezing effect on the yield ratio with nonzero chemical potential may be meaningful for the CBM and PANDA experiments of the FAIR project at GSI.
期刊介绍:
This letters journal, launched in 1986, consists of research papers covering current research developments in Gravitation, Cosmology, Astrophysics, Nuclear Physics, Particles and Fields, Accelerator physics, and Quantum Information. A Brief Review section has also been initiated with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.