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Low Mass Vector Meson at FAIR

Arun Prakash Banaras Hindu University. Low Mass Vector Meson at FAIR. Outline. Introduction Why to study Low Mass Vector Meson(LMVM) How to measure LMVM Past Experiments to detect them How we can Detect them in FAIR. Types of mesons. Type. S. L. P. J. J P. Example.

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Low Mass Vector Meson at FAIR

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  1. Arun Prakash Banaras Hindu University Low Mass Vector Meson at FAIR

  2. Outline • Introduction • Why to study Low Mass Vector Meson(LMVM) • How to measure LMVM • Past Experiments to detect them • How we can Detect them in FAIR

  3. Types of mesons Type S L P J JP Example Pseudo Scalar Meson 0 0 − 0 0− Pion, Kaon ,Eta Meson ,B Meson,D Meson Pseudo vector meson 0 1 + 1 1+ h1(1170),b1(1235), a1(1260),K1(1270), K1(1400) ρ -meson,ω-meson,ϕ-meson J/Ψ-meson Vector meson 1 0 − 1 1− Scalar meson 1 1 + 0 0+ K0*(1430) Tensor meson 1 1 + 2 2+ f2(1270)

  4. Why to study low mass vector mesons In heavy ion collisions, low mass vector mesons provide a clean signal for studying • Chiral symmetry restoration and/or in-medium modification

  5. Restoration of Chiral Symmetry

  6. Expected mass-modification of Light Vector Meson (LVM) <qq> condensate depend on temperature and density Some models predict the mass modification of LVM on hot/dense matter RHIC R. Rapp (Nucl. Phys A661(1999) 238c ~ hadron mass

  7. How to measure LMVM in High energy experiments LMV has hadronic and leptonic decay channels Di-lepton channel is good probe lepton does not interact with the strong coupled medium Leptons carry clean information of LMV Other candidate Collision broadening (hadronic many-body scheme) e+ K+   K- e-

  8. Results from different past experiments • Famous CERES results • enhancement in the pair yield • A probe of Chiral symmetry restoration and/or medium modification • Only hadronic decays so far at RHIC • rp+p- • STAR (Phys. Rev. Lett. 92, 092301) • f K+K- • PHENIX (nucl-ex/0410012) • STAR (nucl-ex/0406003) • Lepton-pair measurement is demanding • should provide information on space-time evolution at RHIC, which might be very different from SPS • mass shift vs broadening R. Rapp (Nucl. Phys A661(1999) 238c

  9. “combinatorial pairs” total background S/B ~ 1/500 Irreducible charm background all signal charm signal How to measure low-mass pairs • At PHENIX, R&D efforts to develop a Dalitz rejecter, in order to manage combinatorial backgrounds • HBD (hadron Blind Detector) is a strong candidate • UV photon detector • with CsI cathode • CF4 gas radiator • Ne(Cherenkov) > Ne(ionization)

  10. The CBM Muon Detection system Fe 20 20 20 30 35 100 cm ≡ 13.5 λI ≡ 7.5 λI low-mass vector meson measurements (compact setup)

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