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In-medium spectral change of vector mesons explored via dielectron decay at J-PARC.

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Τίτλος: In-medium spectral change of vector mesons explored via dielectron decay at J-PARC.
Συγγραφείς: Aoki, Kazuya1 (AUTHOR) kazuya.aoki@kek.jp, Ashikaga, Sakiko2 (AUTHOR), Chang, Wen-Chen3 (AUTHOR), Chujo, Tatsuya4 (AUTHOR), Ejima, Ren5 (AUTHOR), En'yo, Hideto6 (AUTHOR), Esumi, Shinichi4 (AUTHOR), Rodriguez Garces, Dairon7,8 (AUTHOR), Hamagaki, Hideki9 (AUTHOR), Heuser, Johann M.8 (AUTHOR), Honda, Ryotaro1 (AUTHOR), Ichikawa, Masaya1,10 (AUTHOR), Ishii, Daichi11 (AUTHOR), Kajikawa, Shunsuke12 (AUTHOR), Kakunaga, Jo13 (AUTHOR), Kanno, Koki1 (AUTHOR), Kiyomichi, Akio14 (AUTHOR), Hori, Yusuke11 (AUTHOR), Lin, Chih-Hsun3 (AUTHOR), Morino, Yuhei1 (AUTHOR)
Πηγή: EPJ Web of Conferences. 8/1/2026, Vol. 378, p1-5. 5p.
Θεματικοί όροι: *Vector mesons, *Particle detectors, *Particle physics, *Quantum chromodynamics, *Proton-proton interactions, *Particle decays
Περίληψη: J-PARC E16 experiment aims to measure the spectral change of vector mesons in a nuclear medium. It measures dielectron invariant mass spectra in p+A collisions at 30 GeV. The invariant mass is a mixture of the mass of vector mesons that decay inside and outside of the nuclear medium. Therefore, it is sensitive to the in-medium mass of vector mesons. We put emphasis on ϕ meson due to its narrow and isolated peak. According to QCD sum rule calculations, the mass is sensitive to the strange-quark condensate in the medium. We have conducted several commissioning runs while increasing the acceptance, upgrading detectors and DAQ. The last one accepted 206 hours of primary proton beam in total, intermittently conducted in April–June 2024. We were able to demonstrate excellent electron identification capability using Hadron Blind Detector (HBD) and Leadglass (LG) calorimeters, together with four layers of tracking devices, one layer of silicon detectors (SSD) and three layers of Gas Electron Multiplier (GEM) Trackers. ω and ϕ mesons were observed. In this talk, we report the outcomes of the commissioning runs and the prospects for the physics run. [ABSTRACT FROM AUTHOR]
Βάση Δεδομένων: Academic Search Index
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  Data: In-medium spectral change of vector mesons explored via dielectron decay at J-PARC.
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  Data: <searchLink fieldCode="JN" term="%22EPJ+Web+of+Conferences%22">EPJ Web of Conferences</searchLink>. 8/1/2026, Vol. 378, p1-5. 5p.
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– Name: Abstract
  Label: Abstract
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  Data: J-PARC E16 experiment aims to measure the spectral change of vector mesons in a nuclear medium. It measures dielectron invariant mass spectra in p+A collisions at 30 GeV. The invariant mass is a mixture of the mass of vector mesons that decay inside and outside of the nuclear medium. Therefore, it is sensitive to the in-medium mass of vector mesons. We put emphasis on ϕ meson due to its narrow and isolated peak. According to QCD sum rule calculations, the mass is sensitive to the strange-quark condensate in the medium. We have conducted several commissioning runs while increasing the acceptance, upgrading detectors and DAQ. The last one accepted 206 hours of primary proton beam in total, intermittently conducted in April–June 2024. We were able to demonstrate excellent electron identification capability using Hadron Blind Detector (HBD) and Leadglass (LG) calorimeters, together with four layers of tracking devices, one layer of silicon detectors (SSD) and three layers of Gas Electron Multiplier (GEM) Trackers. ω and ϕ mesons were observed. In this talk, we report the outcomes of the commissioning runs and the prospects for the physics run. [ABSTRACT FROM AUTHOR]
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      – Type: doi
        Value: 10.1051/epjconf/202637808006
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      – Code: eng
        Text: English
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      – SubjectFull: Vector mesons
        Type: general
      – SubjectFull: Particle detectors
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      – SubjectFull: Particle physics
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      – SubjectFull: Quantum chromodynamics
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      – SubjectFull: Particle decays
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