G. P. Dubois

STUDY OF THE RADIATIVE DECAY J / PSI ---> GAMMA ETA PI+ PI-

J. Becker, D. Coward, David E. Dorfan, W. Stockhausen et autres

The Mark III collaboration has performed a high statistics study of the reaction J/q3 --) rq7r+7r-, with two different final states of the q, r~ --) 77 and rj --) 7r07r+7r-.Both modes have a broad structure from 1.2 to 1.9 GeV/c2 and …

Limit of the reduction of the spraying volume.

B. Huyghebaert, Fanny Henriet, G. P. Dubois, E. Lorencowicz et autres

CCDC 213136: Experimental Crystal Structure Determination

Anthony D. Murphy, G. P. Dubois, T. Daniel P. Stack

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

CCDC 213137: Experimental Crystal Structure Determination

Anthony D. Murphy, G. P. Dubois, T. Daniel P. Stack

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

[The utilization of the ocular system as a detector of fatigue and disorders of equilibrium].

Baron Jb, Bessineton Jc, G. P. Dubois, G Duflo et autres

Direct Measurement of the Jψ Leptonic Branching Fraction

D. M. Coffman, F. DeJongh, G. P. Dubois, G. Eigen et autres

Partial-wave analysis ofJ/ψ→γη π+ π−

T. Bolton, J. S. Brown, K. O. Bunnell, Mark J. Burchell et autres

We present a study of the decay J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\eta}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$ using the Mark III detector at the SLAC ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ storage ring SPEAR. A partial-wave amplitude analysis is performed on the \ensuremath{\eta}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$ system in the mass region from 1.2 to 1.5 GeV. We observe two …

Observation of f1(1285)→π+π−π+π− in radiative decays

T. Bolton, J. S. Brown, K. O. Bunnell, Mark J. Burchell et autres

We present an analysis of Jψ→γf1(1285), f1(1285)→π+π−π+π−, using the Mark III detector at SPEAR, based on 5.8 × 106 produced Jψ events. We measure B(Jψ→γf1(1285), f1(1285)→π+π−π+π−)=(4.8±1.3±0.9) × 10−5. We obtain a new measurement of the absolute branching ratio of Jψ→γf1(1285). The mixing …

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Resonant substructure in K[over ¯]πππ decays of D mesons

D. M. Coffman, F. DeJongh, G. P. Dubois, G. Eigen et autres

We determine the resonant substructure of $D\ensuremath{\rightarrow}\overline{K}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\pi}$ decays, extracting the relative fractions and phases of the amplitudes contributing to the ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\overline{K}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$, and ${\overline{K}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ final states. We find that two-body decay modes account for at least 75% of these decays. We …

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Direct measurement of theJ/ψ leptonic branching fraction

D. M. Coffman, F. DeJongh, G. P. Dubois, G. Eigen et autres

The Mark III Collaboration has measured the J/\ensuremath{\psi} leptonic branching fractions using the process \ensuremath{\psi}(2S)\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$J/\ensuremath{\psi}, J/\ensuremath{\psi}\ensuremath{\rightarrow}${\mathit{l}}^{+}$${\mathit{l}}^{\mathrm{\ensuremath{-}}}$. The results are B(J/\ensuremath{\psi}\ensuremath{\rightarrow}${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$)=(5.92\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.20)% and B(J/\ensuremath{\psi}\ensuremath{\rightarrow}${\mathrm{\ensuremath{\mu}}}^{+}$${\mathrm{\ensuremath{\mu}}}^{\mathrm{\ensuremath{-}}}$)=(5.90\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.19)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the …

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Measurement of the inclusive decay properties of charmed mesons

D. M. Coffman, F. DeJongh, G. P. Dubois, G. Eigen et autres

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Measurement of the hadronic structure of semileptonic D0 and D+ decays

Zi-Yue Bai, T. Bolton, J. S. Brown, K. O. Bunnell et autres

Absolute branching fractions for the ${\mathit{D}}_{\mathit{l}3}$ and ${\mathit{D}}_{\mathit{l}4}$ decays ${\mathit{D}}^{+}$\ensuremath{\rightarrow}K\ifmmode\bar\else\textasciimacron\fi{} $^{0}$${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$,${\mathit{D}}^{+}$\ensuremath{\rightarrow}K\ifmmode\bar\else\textasciimacron\fi{} $^{0}\mathrm{\ensuremath{\mu}}^{+}$${\ensuremath{\nu}}_{\mathrm{\ensuremath{\mu}}}$, ${\mathit{D}}^{+}$\ensuremath{\rightarrow}K\ifmmode\bar\else\textasciimacron\fi{} $^{\mathrm{*}0}$${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$, and ${\mathit{D}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{*}\mathrm{\ensuremath{-}}}$${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$ are determined using completely reconstructed DD\ifmmode\bar\else\textasciimacron\fi{} events at the \ensuremath{\psi}(3770). Reconstructed ${\mathit{D}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$ decays are used to determine the pole mass of the ${\mathit{f}}_{4}$(${\mathit{q}}^{2}$) form factor. Resonant …