1 / 17

ee→J/ ψ X(1835) & ee→J/ ψρ ( φ )

ee→J/ ψ X(1835) & ee→J/ ψρ ( φ ). Peking University Wang Jian April 19. 2010. pp found by BES. 1. X(1835) found by BES. eta’ excited state? glueball state? Or others?. 2. KEKB/Belle. =10.58GeV. c s d u. 3. ee→J/ ψ cc. Problem. 方 案 一. 4.

sammy
Télécharger la présentation

ee→J/ ψ X(1835) & ee→J/ ψρ ( φ )

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ee→J/ψ X(1835) & ee→J/ψρ(φ) Peking University Wang Jian April 19. 2010

  2. pp found by BES 1

  3. X(1835) found by BES eta’ excited state?glueball state?Or others? 2

  4. KEKB/Belle =10.58GeV c s d u 3

  5. ee→J/ψ cc Problem 方 案 一 4

  6. ee→J/ψ cc vs. ee→J/ψ glueball Problem 方 案 二 5

  7. Searching for X(1835) in recoil mass against J/ψ 6

  8. Backgroundstudy • Combinatorial di-muon events fallen in J/psi mass window(green histogram); • Peaking background: 1.Prompt J/psi a. b. 2.Non-prompt J/psi(negligible from a MC test on ee-> Ψ’γ/ee->Y(4360) γ). Red histogram: continuum background (u,d,s,c) MC generated using EvtGen;Blue one: just u,d,s continuum MC data. 7

  9. Fitting/Result 8

  10. e+e-J/ψ() Introduction 1 2 3 9

  11. e+e-VV----VMD model calculation M. Davier et al, hep-ph/0606155 • Assuming the e+e−→** process followed by conversion of * into V1 and V2, with • effective coupling e/f1 and e/f2 . The cross section in c.m. frame can be written as: • Obtain effective coupling through meson’s leptonic width: • Calculation with this simple VMD model agree with the measurements of • e+e-0/. More calculations based on VMD are summarized in the previous • slide. • The value obtained for e+e-J/psi J/psi differs somewhat from the estimate given by vs. 10

  12. Selection criteria * * Two photon processes was removed under 11

  13. Some plots • Green histograms are MC data scaled to 10.16fb and 1.46fb for e+e-J/ψ and e+e-J/ψ respectively, calculated in hep-ph/0606155. 12

  14. Fitting/results scaled 13

  15. Fitting/results 14

  16. Production anglue and helicity study MC MC Consistent with theoritic prediction using Two-Virtual Photon Annihilation very well. 15

  17. Summary • Set an upper limit for ee→J/ψ X(1835) to be 0.9 fb at 90% CL. • First mesurement for decay e+e-J/ψ(): An upper limit for e+e-J/ψ is set to be 2.4fb at 90%. hep-ph/0606155 which is consistent with the theoritic pridiction: 16

More Related