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Exploring X(3872) Decay Channels: Evidence from gJ/ψ and p+p-J/ψ Measurements

This study presents significant insights into the decay channels of the X(3872) particle, focusing on its transitions to gJ/ψ and p+p-J/ψ. By employing a variety of cuts and vetoes and analyzing data from specific energy regions, we determine branching ratios and constraints on the X(3872)'s structure. The findings suggest that the X(3872) might have a C-parity of +1, potentially ruling out pure cc̅ states. Further analysis aims to enhance signal significance and examine additional decay modes, contributing to our understanding of this intriguing exotic meson.

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Exploring X(3872) Decay Channels: Evidence from gJ/ψ and p+p-J/ψ Measurements

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  1. Evidence for X(3872)gJ/y S.-K. Choi Gyeongsang U S. L. Olsen U of Hawaii Belle ICPV meeting Jan 27, 2005

  2. Select B±K± J/yg(B0KS J/yg running now) • Tight J/y cuts • Loose K± cuts • Eg>40 MeV • p0 veto (c2>4.0) • K* veto (M(Kg)>1.0 GeV • R2<0.4; |cosqB| < 0.8 • |Mbc – 5.28|<0.0055 GeV (2s) • |DE|<0.03 GeV (2s) • E7  E37

  3. M(g J/y) BKcc1; cc1g J/y X signal Region ±32 MeV X(3872)? M(gJ/y)

  4. Expand cc1 region Fit to determine sM(gJ/y) =10.7 MeV |M(gJ/y) – mcc1| < 25 MeV (± 2.4s) Use these fits to get means & sigmas for Mbc and DE Nev(cc1) = 510 ± 23

  5. M(g J/y) in X(3872) region ±64 MeV ±32 MeV M(gJ/y) sideband X(3872) Use this fit to get Efact for ARGUS Nev(X3872) = 10.5 ± 4.0 Signif =  2lnL(0) -2lnL(10.5) = 4.8 s No peaking background

  6. Br(Xg J/y) determination Br(Xg J/y) Br(Xp+p-J/y) = Nev(Xg J/y) Nev(cc1g J/y) Nev(Xp+p-J/y) Nev(y’ p+p-J/y) e(cc1g J/y) e(y’g J/y) e(y’ p+p-J/y) e(Xp+p-J/y) Br(BKcc1)Br(cc1g J/y) Br(BKy’) Br(y’p+p-J/y)   from PDG 1.02 ± 0.22 data: 0.30 ± 0.13 ~1.02± 0.10 = 0.30 ± 0.13 ± 0.06 (Previous 90% CL upper limit was <0.4)

  7. Could the X(3872) be the cc1’ ? Rough expectation for pure charmonium: Barnes, Godfrey hep-ph/0311162 G(23P1 g J/y) ~ 11 keV G(23P1 ppJ/y) ~ G(y’ po J/y) ~ 0 (0.3 keV) ~30 isospin violating we measure 0.3; two orders-of-magnitude smaller; cc1’ component of the X(3872) must be small

  8. Summary • X(3872)gJ/y / X(3872)p+p-J/y=0.30±0.13±0.06 • this says X must have C=+ (as does the XwJ/y obs.) • if 1++ (as ang. analyses prefer), can’t be too much cc1’ • Next: add B0 KSg J/y & look at E39 • improve signal to > 5s??

  9. status Rejected by ang. analyses XgJ/y forbidden

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