Li, Yiming
J/Psi
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rivet Analysis
A Measurement of J / psi decay widths

The BES collaboration Bai, J.Z. ; Chen, G.P. ; Chen, H.F. ; et al.
Phys.Lett.B 355 (1995) 374-380, 1995.
Inspire Record 39870 DOI 10.17182/hepdata.28500

The cross sections for e + e − → hadrons, e + e − , μ + μ − have been measured in the vicinity of the J Ψ resonance using the BES detector operated at BEPC. The partial widths for J Ψ to hadrons, electrons, muons and the total width have been determined to be Γ h = 74.1 ± 8.1 keV, Γ e = 5.14 ± 0.39 keV, Γ μ = 5.13 ± 0.52 keV, and Γ = 84.4 ± 8.9 keV, respectively.

1 data table
Table 1

No description provided.


Measurement of the cross-section for the reaction gamma p ---> J / psi p with the ZEUS detector at HERA

The ZEUS collaboration Derrick, M. ; Krakauer, D. ; Magill, S. ; et al.
Phys.Lett.B 350 (1995) 120-134, 1995.
Inspire Record 393907 DOI 10.17182/hepdata.44897

This paper reports the cross section measurements for the process ep $\rightarrow$ e\jpsip for $Q~2 < 4$ GeV$~2$ at $\sqrt s = 296$ GeV, based on an integrated luminosity of about 0.5pb$~{-1}$, using the ZEUS detector. The \jpsiwas detected in its $\rm e~{+}e~{-}$ and $\rm \mu~{+}\mu~{-}$ decay modes. The photoproduction cross section was measured to be $52~{ \ +7}_{-12}\pm 10$nb at an average $\gamma$p centre of mass energy of 67 GeV and $71~{+13}_{-20}\pm 12$nb at 114 GeV. The significant rise of the cross section compared to lower energy measurements is not in agreement with VDM models, but can be described by QCD inspired models if a rise in the gluon momentum density at low $x$ in the proton is assumed.

1 data table
Table 1

No description provided.


Measurement of the B meson and b quark cross-sections at s**(1/2) = 1.8-TeV using the exclusive decay B0 ---> J / psi K*0 (892)

The CDF collaboration Abe, F. ; Albrow, Michael G. ; Amidei, Dante E. ; et al.
Phys.Rev.D 50 (1994) 4252, 1994.
Inspire Record 382305 DOI 10.17182/hepdata.51050

This paper reports the measurement of the B meson and b quark cross sections through the decay chain B0→J/ψ K*(892)0, J/ψ→μ+μ−, K*(892)0→K+π−, using 4.3 pb−1 of data collected at the Collider Detector at Fermilab in p¯p collisions at qrts=1.8 TeV. We obtain σB=1.5±0.7(stat)±0.6(syst) μb for B0 mesons with transverse momentum PT>9.0 GeV/c and rapidity ‖y‖<1.0. Using this result, we find σb=3.7±1.6(stat)±1.5(syst) μb for b quarks with PT>11.5 GeV/c and rapidity ‖y‖<1.0. The b quark cross section is compared to next-to-leading order QCD calculations and previous measurements.

2 data tables
Table 1

B0 meson cross section.

Table 2

Bquark cross section.


Inclusive J / psi, psi (2S) and b quark production in anti-p p collisions at s**(1/2) = 1.8-TeV

The CDF collaboration Abe, F. ; Amidei, Dante E. ; Anway, Carol E. ; et al.
Phys.Rev.Lett. 69 (1992) 3704-3708, 1992.
Inspire Record 340126 DOI 10.17182/hepdata.19780

Inclusive J/ψ and ψ(2S) production has been studied in p¯p collisions at √s =1.8 TeV using 2.6±0.2 pb−1 of data taken with the Collider Detector at Fermilab. The products of production cross section times branching fraction were measured as functions of PT for J/ψ→μ+μ− and ψ(2S)→μ+μ−. In the kinematic range PT>6 GeV/c and ‖η‖≤0.5 we get σ(p¯p→J/ψ X)B(J/ψ→μ+μ−) =6.88±0.23(stat)−1.08+0.93(syst) nb, and σ(p¯p→ψ(2S)X)B(ψ(2S)→μ+μ−) =0.232±0.051(stat)−0.032+0.029(syst)nb. From these values we calculate the inclusive b-quark production cross section.

6 data tables
Table 1

Cross section times the branching ratio into mu+ mu- pairs.

Table 2

Cross section times the branching ratio into mu+ mu- pairs.

More…

A Measurement of the B meson and b quark cross-sections at s**(1/2) = 1.8-TeV using the exclusive decay B+- ---> J / psi K+-

The CDF collaboration Abe, F. ; Amidei, Dante E. ; Apollinari, G. ; et al.
Phys.Rev.Lett. 68 (1992) 3403-3407, 1992.
Inspire Record 333080 DOI 10.17182/hepdata.19852

This letter reports the full reconstruction of B mesons through the decay chain B±→J/ψ K±, J/ψ→μ+μ−, using data obtained at the Collider Detector at Fermilab in p¯p collisions at √s =1.8 TeV. This exclusive sample, the first observed at a hadron collider, is then used to measure the B-meson cross section, from which we extract the b-quark cross section. We obtain σ=2.8±0.9 (stat) ±1.1(syst) μb for B− mesons with PT>9.0 GeV/c and rapidity ‖y‖<1.0. We obtain σ=6.1±1.9(stat) ±2.4(syst) μb, for b quarks with transverse momentum PT>11.5 GeV/c and rapidity ‖y‖<1.0.

2 data tables
Table 1

B-meson cross section.

Table 2

B-quark cross section.


Properties of $J / \psi$ Production in $\pi^-$ Be and p Be Collisions at 530 GeV/c

The E672/706 collaboration Abramov, V. ; Antipov, Yu. ; Baldin, B. ; et al.
FERMILAB-PUB-91-062-E, 1991.
Inspire Record 315071 DOI 10.17182/hepdata.42566

None

2 data tables
Table 1

Data is extrapolated to full x range.

Table 2

Data requested from authors.


The Production of $J/_{\psi}$ and Associated Particles in the Collision of 530 GeV/c Protons and Pions with Nuclear Targets

De, K. ; Crittenden, R. ; Dzierba, A. ; et al.
(1989) 467-472, 1989.
Inspire Record 280605 DOI 10.17182/hepdata.22998

None

3 data tables
Table 1

Interacting beam cross-section.

Table 2

No description provided.

Table 3

No description provided.


High Transverse Momentum $J/\psi$ Production at the {CERN} Proton - Anti-proton Collider

The UA1 collaboration Albajar, C. ; Albrow, M.G. ; Allkofer, O.C. ; et al.
Phys.Lett.B 200 (1988) 380-390, 1988.
Inspire Record 250764 DOI 10.17182/hepdata.28173

We have studied high transverse momentum J/ψ production in p p interactions at s =630 GeV . The measured cross section times branching fraction for J/ψ→μ + μ − production with p T ⩾5 GeV / c and | y |<2.0 is 7.5±0.7±1.2 nb . The event topology is used to establish that there is J/ψ production from both the direct production of c c bound states and the decay of B hadrons. The inferred yield of J/ψ from beauty decays is compatible with our estimates of beauty production in other channels.

3 data tables
Table 2

Data extracted from figure with g3data.

Table 3

Data extracted from figure with g3data.


SEARCH FOR EXCLUSIVE J / psi PRODUCTION

Chiang, I.H. ; Johnson, R.A. ; Kwan, B.P. ; et al.
Phys.Rev.D 34 (1986) 1619, 1986.
Inspire Record 228262 DOI 10.17182/hepdata.23503

We have searched for exclusive hadronic J/ψ production by looking for narrow resonances in the e+e− mass spectrum of the reaction π−p→e+e−n. No events were observed in the region around 3.1 GeV/c2. The cross section for the reaction π−p→J/ψ n at 13 GeV/c is no more than 103 pb at the 90% confidence level.

1 data table
Table 1

Corrected cross section based on 7.4 pct branching ratio.