The two gluons from chi_b0 decay carry correlated linear polarizations, so the angular correlation between two pion pairs can directly probe the previously unmeasured linearly polarized gluon dihadron fragmentation function.
Inclusive chi_bJ(nP) Decays to D0 X
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
Using Upsilon(2S) and Upsilon(3S) data collected with the CLEO III detector we have searched for decays of chi_bJ to final states with open charm. We fully reconstruct D0 mesons with p_D0 > 2.5 GeV/c in three decay modes (K-pi+, K-pi+pi0, and K-pi-pi+pi+) in coincidence with radiative transition photons that tag the production of one of the chi_bJ(nP) states. We obtain significant signals for the two J=1 states. Recent NRQCD calculations of chi_{bJ}(nP) --> c cbar X depend on one non-perturbative parameter per chi_bJ triplet. The extrapolation from the observed D0 X rate over a limited momentum range to a full c cbar X rate also depends on these same parameters. Using our data to fit for these parameters, we extract results which agree well with NRQCD predictions, confirming the expectation that charm production is largest for the J=1 states. In particular, for J=1, our results are consistent with c cbar g accounting for about one-quarter of all hadronic decays.
fields
hep-ph 1years
2026 1verdicts
CONDITIONAL 1representative citing papers
citing papers explorer
-
Probing Gluon Linear Polarization with Dihadron Fragmentation in $\chi_b$ Decays
The two gluons from chi_b0 decay carry correlated linear polarizations, so the angular correlation between two pion pairs can directly probe the previously unmeasured linearly polarized gluon dihadron fragmentation function.