Date

Subject_areas

Measurement of $\sigma_{\chi_{c2}}{\cal B}(\chi_{c2} \to J/\psi \gamma)/\sigma_{\chi_{c1}} {\cal B}(\chi_{c1} \to J/\psi \gamma)$ in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96-TeV

The CDF collaboration Abulencia, A. ; Adelman, Jahred A. ; Affolder, T. ; et al.
Phys.Rev.Lett. 98 (2007) 232001, 2007.
Inspire Record 746743 DOI 10.17182/hepdata.57248

We measure the ratio of cross section times branching fraction, $R_p \equiv \sigma_{\chi_{c2}} {\cal B}(\chi_{c2} \to J/\psi \gamma)/ \sigma_{\chi_{c1}} {\cal B}(\chi_{c1} \to J/\psi \gamma)$, in 1.1 fb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s} =$ 1.96 TeV. This measurement covers the kinematic range $p_T(J/\psi)>4.0$ GeV/$c$, $|\eta(J/\psi)| < 1.0$, and $p_T(\gamma)>1.0$ GeV/$c$. For events due to prompt processes, we find $R_p = 0.395\pm0.016(stat.)\pm0.015(sys.)$. This result represents a significant improvement in precision over previous measurements of prompt $\chi_{c1,2}$ hadroproduction.

1 data table

Ratios of cross section times branching fractions of the X_cJ states for the prompt events and B decay events Relative systematic uncertainty +-0.037% for SIG(Q=CHI/C2)/SIG(Q=CHI/C1). Relative systematic uncertainty +-0.038% for SIG(Q=B_CHI/C2)/SIG(Q=B_CHI/C1).


Observation of diffractive $J/\psi$ production at the Fermilab Tevatron

The CDF collaboration Affolder, T. ; Akimoto, H. ; Akopian, A. ; et al.
Phys.Rev.Lett. 87 (2001) 241802, 2001.
Inspire Record 560628 DOI 10.17182/hepdata.55764

We report the first observation of diffractive $J/\psi(\to \mu^+\mu^-)$ production in $\bar pp$ collisions at $\sqrt{s}$=1.8 TeV. Diffractive events are identified by their rapidity gap signature. In a sample of events with two muons of transverse momentum $p_T^{\mu}>2$ GeV/$c$ within the pseudorapidity region $|\eta|<$1.0, the ratio of diffractive to total $J/\psi$ production rates is found to be $R_{J/\psi}= [1.45\pm 0.25]%$. The ratio $R_{J/\psi}(x)$ is presented as a function of $x$-Bjorken. By combining it with our previously measured corresponding ratio $R_{jj}(x)$ for diffractive dijet production, we extract a value of $0.59\pm 0.15$ for the gluon fraction of the diffractive structure function of the proton.

3 data tables

Diffractive to total J/psi production ratio.

Ratio of diffractive to total J/psi rate, per unit of the fractional momentum loss of the leading (anti)proton, and as a function of x-Bjorken of the struck parton of the (anti)proton adjacent to the rapidity gap and participating in the J/psi production.

Gluon fraction of the diffractive structure function of the (anti)proton.


Polarization of $J/\psi$ and $\psi_{2S}$ mesons produced in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96-TeV

The CDF collaboration Abulencia, A. ; Adelman, Jahred A. ; Affolder, T. ; et al.
Phys.Rev.Lett. 99 (2007) 132001, 2007.
Inspire Record 747876 DOI 10.17182/hepdata.42742
2 data tables

Polarization parameter ALPHA for J/PSI production.

Polarization parameter ALPHA for PSI(2S) production.


Measurement of the $J/\psi$ meson and $b-$hadron production cross sections in $p\bar{p}$ collisions at $\sqrt{s} = 1960$ GeV

The CDF collaboration Acosta, D. ; Adelman, J. ; Affolder, T. ; et al.
Phys.Rev. D71 (2005) 032001, 2005.
Inspire Record 668026 DOI 10.17182/hepdata.22119

We present a new measurement of the inclusive and differential production cross sections of $J/\psi$ mesons and $b$-hadrons in proton-antiproton collisions at $\sqrt{s}=1960$ GeV. The data correspond to an integrated luminosity of 39.7 pb$^{-1}$ collected by the CDF Run II detector. We find the integrated cross section for inclusive $J/\psi$ production for all transverse momenta from 0 to 20 GeV/$c$ in the rapidity range $|y|<0.6$ to be $4.08 \pm 0.02 (stat)^{+0.36}_{-0.33} (syst) \mu {\rm b}$. We separate the fraction of $J/\psi$ events from the decay of the long-lived $b$-hadrons using the lifetime distribution in all events with $p_T(J/\psi) > 1.25$ GeV/$c$. We find the total cross section for $b$-hadrons, including both hadrons and anti-hadrons, decaying to $J/\psi$ with transverse momenta greater than 1.25 GeV/$c$ in the rapidity range $|y(J/\psi)|<0.6$, is $ 0.330 \pm 0.005 (stat) ^{+0.036}_{-0.033} (syst) ~\mu{\rm b}$. Using a Monte Carlo simulation of the decay kinematics of $b$-hadrons to all final states containing a $J/\psi$, we extract the first measurement of the total single $b$-hadron cross section down to zero transverse momentum at $\sqrt{s}=1960$ GeV. We find the total single $b$-hadron cross section integrated over all transverse momenta for $b$-hadrons in the rapidity range $|y|<0.6$ to be $ 17.6 \pm 0.4 (stat)^{+2.5}_{-2.3} (syst) \mu{\rm b}$.

6 data tables

Integrated J/PSI cross section shown both uncorrected and corrected for branching ratio (5.88+-0.10PCT) of J/PSI into mu+mu-. Systematic error includes pT-dependent and fully correlated errors added in quadrature.

Differential cross section times branching ratio (5.88+-0.10PCT) into mu+mu- as a function of transverse momentum for the rapidity range -0.6 to 0.6 at a centre-of-mass energy of 1960 GeV.

Integrated bottom-hadron prouction cross section shown both uncorrected andcorrected for branching ratio (5.88+-0.10PCT) of J/PSI into mu+mu-. Systematic error includes pT-dependent and fully correlated errors added in quadrature.

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Cross section for forward $J/\psi$ production in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

The CDF collaboration Acosta, D. ; Affolder, T. ; Akimoto, H. ; et al.
Phys.Rev. D66 (2002) 092001, 2002.
Inspire Record 603674 DOI 10.17182/hepdata.22217
2 data tables

The integrated cross section for J/PSI --> MU+ MU- decay.

Cross section as a function of PT. Statistical errors only.


$J/\psi$ and $\psi(2S)$ production in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

The CDF collaboration Abe, F. ; Akimoto, H. ; Akopian, A. ; et al.
Phys.Rev.Lett. 79 (1997) 572-577, 1997.
Inspire Record 440101 DOI 10.17182/hepdata.42223
5 data tables

Integrated cross sections.

Differential cross section times branching ratio for J/PSI's originating from b hadron decays.

Differential cross section times branching ratio for PSI(2S) originating from b hadron decays.

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Production of $J/\psi$ mesons from $\chi_c$ meson decays in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

The CDF collaboration Abe, F. ; Akimoto, H. ; Akopian, A. ; et al.
Phys.Rev.Lett. 79 (1997) 578-583, 1997.
Inspire Record 440446 DOI 10.17182/hepdata.42231
4 data tables

Fraction of J/PSI mesons from CHI/C decays, excluding the the contributions from b-hadron decay.

Differential cross section for J/PSI's directly produced (ie excluding CHI/C and PSI/(25) decay contribution to the prompt production cross section). RE = PBAR P --> J/PSI X.

Differential cross section for J/PSI's produced in CHI/C decays.

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$J/\psi$ production in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.8-TeV

The D0 collaboration Abachi, S. ; Abbott, B. ; Abolins, M. ; et al.
Phys.Lett. B370 (1996) 239-248, 1996.
Inspire Record 415417 DOI 10.17182/hepdata.42319
5 data tables

No description provided.

No description provided.

Integrated b-quark production cross section.

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Inclusive $J/\psi$, $\psi(2S)$ and $b$ quark production in $\bar{p}p$ collisions at $\sqrt{s} = 1.8$ 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
6 data tables

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

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

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J / psi and psi-prime production at the CERN p anti-p collider

The UA1 collaboration Albajar, C. ; Albrow, M.G. ; Allkofer, O.C. ; et al.
Phys.Lett. B256 (1991) 112-120, 1991.
Inspire Record 300862 DOI 10.17182/hepdata.26999
4 data tables

Numerical values supplied by Nick Ellis.

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Measurement of the inclusive J / psi production cross-sections in anti-p p and p p collisions at s**(1/2) = 24.3-GeV

The UA6 collaboration Morel, C. ; Bernasconi, A. ; Breedon, R.E. ; et al.
Phys.Lett. B252 (1990) 505-510, 1990.
Inspire Record 300180 DOI 10.17182/hepdata.29505
3 data tables

Extrapolation to full forward hemisphere (yrap > 0.0) uses the Bourquin-Gaillard parametrization (NP B114(76)334).

Extrapolation to full forward hemisphere (yrap > 0.0) uses the Bourquin-Gaillard parametrization (NP B114(76)334).

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. B200 (1988) 380-390, 1988.
Inspire Record 250764 DOI 10.17182/hepdata.28173
3 data tables

Data extracted from figure with g3data.

Data extracted from figure with g3data.


Experimental J/psi Hadronic Production from 150-GeV/c to 280-GeV/c

The NA3 collaboration Badier, J. ; Boucrot, J. ; Bourotte, J. ; et al.
Z.Phys. C20 (1983) 101, 1983.
Inspire Record 191240 DOI 10.17182/hepdata.2212
11 data tables

No description provided.

No description provided.

No description provided.

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Experimental Results on $J/\psi$ Production by $\pi^\pm$, $K^\pm$, $p$ and $\bar{p}$ Incident on Hydrogen at 39.5-{GeV}/$c$

Corden, M.J. ; Dowell, J.D. ; Garvey, J. ; et al.
Phys.Lett. B98 (1981) 220-224, 1981.
Inspire Record 155716 DOI 10.17182/hepdata.5488
3 data tables

ERRORS ONLY STAT.

ERRORS ONLY STAT.

No description provided.