Pseudo invariant masses of hadrons in nuclei

✍ Scribed by Toshimitsu Yamazaki; Yoshinori Akaishi

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 175 KB
• Volume: 654
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)88499-7

✦ Synopsis

Effects of nuclear medium on the invariant mass spectrum of a decaying hadron are discussed. Importance of correlated decays at high nuclear densities is emphasized.

Since hadrons are composite particles, their sizes, masses, etc., are expected to change in nuclei. How the hadronic masses are modified in nuclei presents extremely interesting questions related to quantum chromodynamics. There are a number of theories in this respect [1 3], whereas there is no clear experimental information yet. Recent results of the CERES [4] and the HELIOS-3 [5] experiments on dilepton invariant mass spectra have revealed an anomalous excess in the 0.3-0.6 GeV range, which is often interpreted in terms of a decreased p meson mass in the nuclear medium . In such attempts invariantmass like quantities are reconstructed from measured momenta of daughter particles (with masses (rrh, m2, ..) and momenta (p~, p~) as Mi* ~ = E~ _ p~ = (~ E~) ~-(~)~.