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1Direct Observation and Partial-Width Measurement of Γγ Decay of Charmonium States

C BAGLIN,S BAIRD,G BASSOMPIERRE,G BORREANI,JC BRIENT,C BROLL, JM BROM,L BUGGE,T BURAN,JP BURQ,A BUSSIERE,A BUZZO,

As part of the charmonium formation experiment at the CERN Intersecting Storage Rings, we studied the reaction pp→cc→γγ in an antiproton momentum scan through the ηc, χ1, and χ2 regions. We report events observed in the ηc and χ2 regions, whilst no event was observed in the χ1 region, as expected for a spin-1 state.

1987PHYSICS LETTERS B（1987）引用：75

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2Angular distributions in the reaction p$\overline{p}$ --> chi$_{1,2}$ --> gamma.psi --> gamma.e+e-

Ch Baglin,S A Baird,G Bassompierre,G Borreani,J C Brient,C Broll, Jm Brom,L Bugge,T Buran,J P Burq,A Bussiere,A Buzzo,

1987引用：23

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3J/Ψ Resonant Formation and Mass Measurement in Antiproton-Proton Annihilations

C BAGLIN,G BASSOMPIERRE,JC BRIENT,C BROLL,A BUSSIERE,JP GUILLAUD,C MORCH,M POULET,S BAIRD,E KHANARONSEN,L LEISTAM,A LUNDBY,

Experiment R704, the last to be performed at the CERN-ISR, has successfully applied a new method to study (cc) states formed directly in antiproton-proton annihilations. The novelty of the method rests on the capability to build a highly performing annihilation source by letting a cold

1987NUCLEAR PHYSICS B（1987）引用：50

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4Angular distributions in the reactions pp-->chi1,2-->gammapsi-->gammae+e-

C Baglin,S A Baird,G Bassompierre,G Borreani,J C Brient,C Broll,J M Brom,L Bugge,T Buran,J P Burq,A Bussiere,A Buzzo,

1987Physics Letters B（1987）引用：23

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5Angular-Distributions In The Reactions Ppbar-]Chi-1,2-]Gamma-Psi-]Gamma-Ete-

C Baglin,S A Baird,G Bassompierre,G Borreani,J C Brient,C Broll,J M Brom,L Bugge,T Buran,J P Burq,A Bussiere,A Buzzo,

1987PHYSICS LETTERS B（1987）引用：12

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6Angular distributions in the reactions $p\vec p \rightarrow \chi_{1,2} \rightarrow \gamma\psi \rightarrow \gamma e^+e^-$

C. Baglin,S. Baird,G. Bassompierre,G. Borreani,J.C. Brient,C. Broll,J.M. Brom,L. Bugge,T. Buran,J.-P. Burq,A. Bussiere,A. Buzzo,

1986Physics Letters B引用：23

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7Formation of the Χ1 and Χ2 Charmonium Resonances in Antiproton-Proton Annihilation and Measurements of Their Masses and Total Widths

C BAGLIN,S BAIRD,G BASSOMPIERRE,G BORREANI,JC BRIENT,C BROLL,JM BROM,L BUGGE,T BURAN,JP BURQ,A BUSSIERE,A BUZZO,

In an experiment performed at the CERN-ISR the direct formation is observed of the χ1 and χ2 charmonium states in proton-antiproton annihiliation. A novel technique provided excellent energy resolution together with small background and reduced systematics. The following values for the masses and total widths of the states were obtained: Λχ1 <3 MeV (95% CL); mχ1 = (3511.3±0.4±0.4) MeV; Λχ2=(2.6 +1.4−1.0) MeV; mξ2=(3556.9±0.4±0.5) MeV. First measurements of the partial widths to antiproton-proton are also reported: Λ(χ1→pp)=57+13-11±11) and Λ(χ2→pp)=(233 +51-45±48) eV.

1986Physics Letters B（1986）引用：70

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8Formation of charmonium states in $\overline{p}$p annihilations

Ch Baglin,S A Baird,G Bassompierre,G Borreani,J C Brient,C Broll, Jm Brom,L Bugge,T Buran,J P Burq,A Bussiere,A Buzzo,

1986引用：23

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9Search for the 1P1 Charmonium State in Annihilations at the CERN Intersecting Storage Rings

C BAGLIN,S BAIRD,G BASSOMPIERRE,G BORREANI,JC BRIENT,C BROLL, JM BROM,L BUGGE,T BURAN,JP BURQ,A BUSSIERE,A BUZZO,

This experiment has been performed at the CERN Intersecting Storage Rings to study the direct formation of charmonium states in antiproton-proton annihilations. The experimental program has partly been devoted to an inclusive scan for pp → J/ψ + X in the range 3520–3530 MeV/c2. A cluster of five events has been observed in a narrow energy band, centred on the centre of gravity of the 3PJ states where the 1P1 is expected to be. When interpreted as a new resonace, these data yield a mass m = 3525.4±0.8 MeV/c2.

1986Physics Letters B（1986）引用：123

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10CHI Formation by Antiproton Annihilations on Hydrogen: Results from Experiment R704 at the CERN ISR

C BAGLIN, G BAIRD,G BASSOMPIERRE,G BORREANI,JC BRIENT,C BROLL,JM BROM,L BUGGE,T BURAN,JP BURQ,A BUSSIERE,A BUZZO,

Recent measurements of masses, total widths and branching ratios to pp̄ of χ1 and χ2 charmonium states are reported: a novel experimental technique (circulating p̄ beams+gas jet target) has provided excellent energy resolution, together with small background and reduced systematics.

1985AIP CONFERENCE PROCEEDINGS（1985）

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11Charmonium spectroscopy at the ISR using an antiproton beam and a hydrogen gas "jet target"