Bumps Under J/Ψ

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Bumps Under J/Ψ The Eta, Omega, and Phi mesons Mesons • A Meson is a sub atomic particle made up of a Quark and an Anti- Quark. • Mesons are a part of the Hadron family. • They have spins and are considered Bosons. • They play a crucial part in nuclear interaction since they act as force mediating particles over short distances. Shield of the University of Bristol where the first Meson, the Pion, was Discovered in 1947 by Cecil Powell, Cesar Lattes, and Giuseppe Occhialini. The Eta (η) Meson on a Large Scale The Eta (η) Meson The Eta (η) Meson, Continued.. • The Eta Meson is a η Mass: 0.547 GeV combination of the Up, η’ Mass: 0.957 GeV Down, and Strange -19 Quarks and their Anti- η Lifetime: 5.0x10 η’ Lifetime: 3.2x10-21 Quarks. • The Top Quark is unable to create a similar Meson because of its fast decay rate. • The Eta Meson was discovered in 1961 while colliding Pion Nucleons at the Bevatron. Image of the Bevatron Accelerator at Lawrence Berkeley National Laboratory. The Omega (ω) Meson The Omega (ω) Meson, Continued.. • The Omega Meson has a mass of ω Mass: 0.782 GeV 1,532 times larger than an -25 electron. ω Lifetime: 7.0x10 • Discovered in 1961 by B. Maglic , L. Alvarez, A. Rosenfield and M. Stevenson. The Phi (φ) Meson The Phi (φ) Meson, Continued.. • Formed from the Strange Quark and the Strange φ Mass: 1.02 GeV Anti-Quark. φ Lifetime: 1.55x10-22 • Decays into two Kaons. • The Phi Meson is a Vector Meson. • Discovered at Brookhaven National Laboratory in the 1950s. The End! Credits (1/2): Purav Patel (left): Researcher, Iron Man, Connor Watson Tony Stark, Genius, (right): Billionaire, -Researcher and Philanthropist PowerPoint Compiler (I created the intro video too) Steve Dobry (bottom): -Researcher and •Oh yeah, and Cid Khode PowerPoint Compiler too! (bottom) -Researcher Credits (2/2): IT’S FRIDAY!!!! Have a great summer everyone!! Thanks: • We would like to thank Amitabh Lath and Steve Schnetzer for hosting the Rutgers QuarkNet program on behalf of the Rutgers Physics Department! • We would also like to thank all of the other people who came in to present for us! • We would like to thank all of the students and teachers who helped make this program cool! .

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Selfconsistent Description of Vector-Mesons in Matter 1
Selfconsistent description of vector-mesons in matter 1 Felix Riek 2 and Jörn Knoll 3 Gesellschaft für Schwerionenforschung Planckstr. 1 64291 Darmstadt Abstract We study the influence of the virtual pion cloud in nuclear matter at finite den- sities and temperatures on the structure of the ρ- and ω-mesons. The in-matter spectral function of the pion is obtained within a selfconsistent scheme of coupled Dyson equations where the coupling to the nucleon and the ∆(1232)-isobar reso- nance is taken into account. The selfenergies are determined using a two-particle irreducible (2PI) truncation scheme (Φ-derivable approximation) supplemented by Migdal’s short range correlations for the particle-hole excitations. The so obtained spectral function of the pion is then used to calculate the in-medium changes of the vector-meson spectral functions. With increasing density and temperature a strong interplay of both vector-meson modes is observed. The four-transversality of the polarisation tensors of the vector-mesons is achieved by a projector technique. The resulting spectral functions of both vector-mesons and, through vector domi- nance, the implications of our results on the dilepton spectra are studied in their dependence on density and temperature. Key words: rho–meson, omega–meson, medium modifications, dilepton production, self-consistent approximation schemes. PACS: 14.40.-n 1 Supported in part by the Helmholz Association under Grant No. VH-VI-041 2 e-mail:[email protected] 3 e-mail:[email protected] Preprint submitted to Elsevier Preprint Feb. 2004 1 Introduction It is an interesting question how the behaviour of hadrons changes in a dense hadronic medium.
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