Moments of ϕ meson spectral functions in vacuum and nuclear matter
Moments of the ϕ meson spectral function in vacuum and in nuclear matter are analyzed, combining a model based on chiral SU(3) effective field theory (with kaonic degrees of freedom) and finite-energy QCD sum rules. For the vacuum we show that the spectral density is strongly constrained by a recent...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2015-12-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269315008278 |
| _version_ | 1828521569402486784 |
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| author | Philipp Gubler Wolfram Weise |
| author_facet | Philipp Gubler Wolfram Weise |
| author_sort | Philipp Gubler |
| collection | DOAJ |
| description | Moments of the ϕ meson spectral function in vacuum and in nuclear matter are analyzed, combining a model based on chiral SU(3) effective field theory (with kaonic degrees of freedom) and finite-energy QCD sum rules. For the vacuum we show that the spectral density is strongly constrained by a recent accurate measurement of the e+e−→K+K− cross section. In nuclear matter the ϕ spectrum is modified by interactions of the decay kaons with the surrounding nuclear medium, leading to a significant broadening and an asymmetric deformation of the ϕ meson peak. We demonstrate that both in vacuum and nuclear matter, the first two moments of the spectral function are compatible with finite-energy QCD sum rules. A brief discussion of the next-higher spectral moment involving strange four-quark condensates is also presented. |
| first_indexed | 2024-12-11T19:52:18Z |
| format | Article |
| id | doaj.art-fd211383b9f1471998176b9d95588869 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-11T19:52:18Z |
| publishDate | 2015-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-fd211383b9f1471998176b9d955888692022-12-22T00:52:45ZengElsevierPhysics Letters B0370-26931873-24452015-12-01751C39640110.1016/j.physletb.2015.10.068Moments of ϕ meson spectral functions in vacuum and nuclear matterPhilipp Gubler0Wolfram Weise1ECT*, Villa Tambosi, 38123 Villazzano (Trento), ItalyECT*, Villa Tambosi, 38123 Villazzano (Trento), ItalyMoments of the ϕ meson spectral function in vacuum and in nuclear matter are analyzed, combining a model based on chiral SU(3) effective field theory (with kaonic degrees of freedom) and finite-energy QCD sum rules. For the vacuum we show that the spectral density is strongly constrained by a recent accurate measurement of the e+e−→K+K− cross section. In nuclear matter the ϕ spectrum is modified by interactions of the decay kaons with the surrounding nuclear medium, leading to a significant broadening and an asymmetric deformation of the ϕ meson peak. We demonstrate that both in vacuum and nuclear matter, the first two moments of the spectral function are compatible with finite-energy QCD sum rules. A brief discussion of the next-higher spectral moment involving strange four-quark condensates is also presented.http://www.sciencedirect.com/science/article/pii/S0370269315008278 |
| spellingShingle | Philipp Gubler Wolfram Weise Moments of ϕ meson spectral functions in vacuum and nuclear matter Physics Letters B |
| title | Moments of ϕ meson spectral functions in vacuum and nuclear matter |
| title_full | Moments of ϕ meson spectral functions in vacuum and nuclear matter |
| title_fullStr | Moments of ϕ meson spectral functions in vacuum and nuclear matter |
| title_full_unstemmed | Moments of ϕ meson spectral functions in vacuum and nuclear matter |
| title_short | Moments of ϕ meson spectral functions in vacuum and nuclear matter |
| title_sort | moments of ϕ meson spectral functions in vacuum and nuclear matter |
| url | http://www.sciencedirect.com/science/article/pii/S0370269315008278 |
| work_keys_str_mv | AT philippgubler momentsofphmesonspectralfunctionsinvacuumandnuclearmatter AT wolframweise momentsofphmesonspectralfunctionsinvacuumandnuclearmatter |