Quarkonium Resources
Differential cross sections of J/ψ and ψ'
in 800 GeV/c p-Si interactions.
T. Alexopoulos et al. (E771 Collaboration), Phys. Rev. D 55 (1997) 3927.
Reaction: |
800 GeV (fixed target) p + Si → J/ψ, ψ' |
Acceptance: |
-0.05<xF<0.25,
pT<3.5 GeV,
-0.8<Cos(θ)<0.8 |
Sample size: |
11660±139 J/ψ, 218±24 ψ' |
Nuclear effects: |
Correction using α=0.920±0.008 |
Results: |
σ= |
375±4±30 nb (J/ψ), |
σ= |
46±3±10 nb (ψ') |
|
Detailed xF and pT
distributions are given. A fit to the Cos(θ) distribution is
also presented. |
Measurement of J/ψ and ψ' production
in 800 GeV/c p-Au collisions.
M. H. Schub et al. (E789 Collaboration), Phys. Rev. D 52 (1995) 1307.
Reaction: |
800 GeV (fixed target) p + Au → J/ψ, ψ' |
Acceptance: |
- |
Sample size: |
112649±486 J/ψ, 1824±114 ψ' |
Nuclear effects: |
Correction using α=0.90±0.02 |
Results: |
σ= |
442±2±88 nb (J/ψ), |
σ= |
75±5±22 nb (ψ') |
|
The systematic error for ψ' is stated to be a lower bound.
Detailed xF and pT distributions are given. |
Measurement of J/ψ, ψ' and Υ
total cross sections in 800 GeV/c p-Si interactions.
T. Alexopoulos et al. (E771 Collaboration), Phys. Lett. B 374 (1996) 271.
Reaction: |
800 GeV (fixed target) p + Si → J/ψ, ψ',
Υ |
Acceptance: |
-0.1<xF<0.3,
pT<3.5 GeV |
Sample size: |
11660±139 J/ψ, 218±24 ψ' |
Results: |
BR . σ = |
21.8±0.3±1.4 nb (J/ψ), |
σ= |
0.360±0.040±0.024 nb (ψ') |
|
Production of Charmonium states in π- Be
collisions at 515 GeV/c.
V. Koreshev et al. (E672-E706 Collaborations),
Phys. Rev. Lett. 77 (1996) 4294.
Reaction: |
515 GeV (fixed target) π + Be → J/ψ, ψ' |
Production of J/ψ and ψ(2S) mesons in
π- Be collisions at 515 GeV/c.
A. Gribushin et al. (E672-E706 Collaborations),
Phys. Rev. D 53 (1996) 4723.
Reaction: |
515 GeV (fixed target) π- + Be → J/ψ, ψ' |
Acceptance: |
0.1<xF<0.8,
pT<3.5 GeV,
-0.8<Cos(θ)<0.8 |
Sample size: |
11660±139 J/ψ, 218±24 ψ' |
Nuclear effects: |
Correction using α=0.920±0.008 |
Results: |
BR . σ = |
9.3±0.1±1.1 nb
(J/ψ, xF>0.1), |
BR . σ = |
12.9±0.2±1.6 nb
(J/ψ, xF>0.0), |
BR . σ = |
7.4±1.5±1.2 nb
(ψ', xF>0.1) |
Fraction of J/ψ
due to ψ' = 0.083±0.017±0.013 |
|
Detailed xF and pT
distributions are given. A fit to the Cos(θ) distribution is also
presented.
|
Production of χ Charmonium via 300 GeV/c pion
and proton interactions on a Lithium target.
L. Antoniazzi et al. (E705 Collaboration),
Phys. Rev. D 49 (1994) 543.
Reaction: |
300 GeV (fixed target) p + Li → χc |
Reaction: |
300 GeV (fixed target) π + Li → χc |
A measurement of J/ψ and ψ' production in 300 GeV/c
proton, anti-proton and π± nucleon interactions.
L. Antoniazzi et al. (E705 Collaboration),
Phys. Rev. D 46 (1992) 4828.
Reaction: |
300 GeV (fixed target) p + Li → J/ψ, ψ' |
Reaction: |
300 GeV (fixed target) pbar + Li → J/ψ, ψ' |
Reaction: |
300 GeV (fixed target) π + Li → J/ψ, ψ' |
Production of J/ψ via ψ' and χ decay in 300 GeV/c proton
and π± nucleon interactions.
L. Antoniazzi et al. (E705 Collaboration),
Phys. Rev. Lett. 70 (1993) 383.
Reaction: |
300 GeV (fixed target) p + Li → χc,
ψ' → J/ψ |
Reaction: |
300 GeV (fixed target) π + Li → χc,
ψ' → J/ψ |
Measurement of J/ψ, ψ' and Υ total cross sections
in 800 GeV/c p-Si interactions.
T. Alexopoulos et al. (E771 Collaboration),
Phys. Lett. B 374 (1996) 271.
Reaction: |
800 GeV (fixed target)
p + Si → J/ψ, ψ', Υ |
Acceptance: |
-0.1<xF<0.3, pT<3.5 GeV |
Sample size: |
10±4 Upsilon |
Results: |
BR . σ =
8.0±3.3±0.6 nb (Υ+Υ') |
J/ψ1(3S1)
- Baek et al use a value 0.73
GeV3 without attribution.
- Cho and Leibovich quote a value 1.2
GeV3 using a potential model computation. The value is
not cross checked against any experimental data.
- Beneke, Maltoni and Rothstein quote a value
1.16 GeV3 using the same potential model as above.
J/ψ8(3S1)
- Baek et al use a value 0.015
GeV3 without attribution.
- Cho and Leibovich quote a value 0.012
GeV3 from the J/psi rate and the
observed Chi_c to direct J/psi ratio at the TEVATRON.
- Beneke and Kraemer find the three values
- (1.06±0.14)10-2GeV3
for use with CTEQ4L densities
- (1.12±0.14)10-2GeV3
for the GRV (94) LO set
- (1.40±0.22)10-2GeV3
using the MRS-R2 set
- Gupta and Sridhar have used (6.6±2.1) 10-3
GeV3.
J/ψ8(1S0)
+7 J/ψ8(3P0)/(2 m2)
or similar combinations appear in the computation of the PT
spectrum of J/psi produced at the Tevatron.
- Beneke and Kraemer find the three values
- (4.38±1.15)10-2GeV3
for use with CTEQ4L densities
- (3.90±1.14)10-2GeV3
for the GRV (94) LO set
- (10.9±2.07)10-2GeV3
using the MRS-R2 set
J/ψ8(1S0)
+3.1 J/ψ8(3P0)/m2
- Beneke, Maltoni and Rothstein quote the range
(0.4-2.3) 10-2 GeV3 using CLEO measurements
of the branching ratio B→J/ψ+X. The other matrix elements input to
this computation use the CTEQ4L compatible values.
J/ψ8(1S0)
+3 J/ψ8(3P0)/m2
+4 J/ψ8(3P2)/(5 m2)
appears in low energy hadro- and photo-production of J/psi.
- Fleming and Maksymyk extracted a
value 0.200±0.001 GeV3 from almost elastic
photo-production data. The diffractive component was not removed
before fitting.
χ11(3P1)
are related to the derivative of the wavefunction of Chi_c(J) states
at the origin. Using heavy quark spin symmetry it can be shown that
the values for different J are in the ratio 2J+1 upto relative order
v2.
- Cho and Leibovich quote a value 0.32
GeV5 using a potential model computation. The value is
not cross checked against any experimental data.
- Beneke, Maltoni and Rothstein quote the range
0.144 mc2 GeV5
using the same potential model.
- Mangano and Petrelli quote a value for the
derivative of the Chi_c wavefunction at the origin based on a fit
to data on decay widths. The derivative value gives for the decay
matrix element 0.06±0.01 GeV5.
χ18(3S1)
is usually the only matrix element in this family which is quoted.
All corresponding χc(J) matrix elements may be obtained from this
to order v2 accuracy using the heavy quark spin symmetry
relation that they are in the ratio of (2J+1).
- Cho and Leibovich quote a value 0.016
GeV5 from the J/ψ rate and the observed χc to
direct J/ψ ratio at the TEVATRON.
- Gupta and Sridhar have used (9.8±1.3)
10-3 GeV3.
- Beneke, Maltoni and Rothstein quote the range
(3)(4.5-6.5) 10-3 GeV3 from fits to CLEO data
on the decay B → χ2+anything. (The first factor of 3 is the
2J+1 factor.) However, this gives too small a branching fraction for
χ1.
ψ'1(3S1)
ψ'8(3S1)
appears in the production cross section for ψ' at the Tevatron.
- Cho and Leibovich quote a value 0.0073
GeV3.
- Beneke and Kraemer find the three values
(0.44±0.08) 10-2 GeV3 |
for use with CTEQ4L densities, |
(0.46±0.08) 10-2 GeV3 |
for the GRV (94) LO set and |
(0.56±0.11) 10-2 GeV3 |
using the MRS-R2 set. |
ψ'8(1S0)
+7 ψ'8(3P0)/(2 m2)
or similar combinations appear in the computation of the PT
spectrum of ψ' produced at the Tevatron.
- Beneke and Kraemer find the three values
(1.80±0.56) 10-2 GeV3 |
for use with CTEQ4L densities, |
(1.60±0.51) 10-2 GeV3 |
for the GRV (94) LO set and |
(4.36±0.96) 10-2 GeV3 |
using the MRS-R2 set. |
ψ'8(1S0)
+3.1 ψ'8(3P0)/m2
- Beneke, Maltoni and Rothstein quote the range
(0.0-1.0) 10-2 GeV3 using CLEO measurements
of the branching ratio B→Psi'+X. The other matrix elements input to
this computation use the CTEQ4L compatible values.
Υ1(3S1)
- Cho and Leibovich quote a value 9.3
GeV3 using a potential model computation. The value is
not cross checked against any experimental data.
Υ8(3S1)
- Cho and Leibovich use a scaling relation
to relate this to the corresponding J/psi matrix element and get
0.0095GeV3.
Υ'1(3S1)
- Cho and Leibovich quote a value 4.6
GeV3 using a potential model computation. The
value is not cross checked against any experimental data.
Υ'8(3S1)
- Cho and Leibovich use a scaling relation
to relate this to the corresponding Psi' matrix element and get
0.0057GeV3.
Υ''1(3S1)
- Cho and Leibovich quote a value 3.5
GeV3 using a potential model computation. The value is
not cross checked against any experimental data.
References
- S. Baek, P. Ko, J. Lee and H. S. Song,
Phys Rev D 55
(1997) 6839.
Quote values for two J/ψ production matrix elements without
attribution.
- M. Beneke and M. Kramer,
Phys Rev D 55
(1997) 5269.
Performs a fit to the Tevatron data to extract two combinations
of J/ψ and ψ' octet matrix elements. The results are reported
for mc=1.5 GeV and a choice of factorisations scale of
(PT2+4mc2)1/2.
Uncertainties from choice of scale, structure function set etc
are systematically explored.
- Peter Cho and Adam K. Leibovich,
Phys Rev D 53 (1996) 150.
Uses a quark potential model to compute several colour singlet
matrix elements. Some colour octet matrix elements are obtained
by a fit to Tevatron data on total J/ψ and ψ' cross sections
as well as the χc contribution to the total J/ψ rate.
- Peter Cho and Adam K. Leibovich,
Phys Rev D 53 (1996) 6203.
- Sean Fleming and Igor Maksymyk,
hep-ph/9603266.
Fits a particular combination of J/ψ octet matrix elements to
data on almost elastic photo-production. The diffractive
component of the data is not removed before fitting.
- M. L. Mangano and Andrea Petrelli,
Phys Lett B 352 (1995) 445.
Uses data on decays of the χc states into two photons and light
hadrons to fix the decay matrix elements. Comparison with Braaten,
Brodsky and Lepage is necessary to convert their parameters into
the standard form. Subsequently, the singlet decay matrix elements
may be converted to production matrix elements using the vacuum
saturation approximation.
- M. Beneke, F. Maltoni and I. Z. Rothstein,
hep-ph/9808360.
Obtains the long-distance matrix elements from the decays $B→H(cc)+X$.
Compiled by: Sourendu Gupta,
June 12, 1997.