Production of<i>J</i>/ψ via ψ’ and χ decay in 300 GeV/<i>c</i>proton- and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">π</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-nucleon interactions

Antoniazzi, L.; Arenton, M. W.; Cao, Z.; Chen, T; Conetti, S.; Cox, B.; Delchamps, S.; Fortney, L.; Guffey, K.; Haire, M.; Ioannou, P.; Cm, Jenkins; Dj, Judd; Kourkoumelis, C.; Manousakis-Katsikakis, A.; Kuźmiński, J.; LeCompte, T.; Marchionni, A.; He, M.; Po, Mazur; Ct, Murphy; Pramantiotis, P.; Rameika, R.; Lk, Resvanis; Rosati, M.; Rosen, J.; Shen, C.H.; Shen, Qing; Simard, André; Rp, Smith; Spiegel, L.; Dg, Stairs; Tan, Yong; Rj, Tesarek; Turkington, T.G.; Turnbull, L.; Turkot, F.; Tzamarias, S.; Voulgaris, G.; Wagoner, D. E.; Wang, C; Yang, W. C.; N, Yao; Zhang, N; Zhang, X; Zioulas, G.; Zou, B. S.

doi:10.1103/physrevlett.70.383

Cited by 97 publications

(38 citation statements)

References 29 publications

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“…There is no data on σ(χ c0 ), but our χ c1 /χ c2 ratio is consistent with the value 0.6 ± 0.3 measured in πN collisions [22,23]. The experimental ratio allows a CSM contribution to χ c2 production which is about equal to the one given in Table II (σ(χ c1 ) is small in the CSM).…”

Section: The P -Wave Quarkonium Cross Sectionssupporting

confidence: 83%

“…The P -wave quarkonium states χ J are produced from quark pairs with S = 0, L = 1 followed by a spin-flip interaction with a transverse gluon from Γ. The calculated cross section ratio σ(χ 1 )/σ(χ 2 ) = 3/5, in agreement with the ratio measured in πN collisions for charmonium, 0.6 ± 0.3 [22,23]. We also find that due to the indirect χ cJ → J/ψ+γ contributions the total J/ψ polarization is slightly longitudinal, λ = −.14 (cf.…”

Section: B Summarysupporting

confidence: 79%

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Quarkonium production through hard comover scattering

Hoyer

Peigné

1999

Phys. Rev. D

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We propose a qualitatively new mechanism for quarkonium production, motivated by the global features of the experimental data and by the successes/failures of existing models. In QCD, heavy quarks are created in conjunction with a bremsstrahlung color field emitted by the colliding partons. We study the effects of perturbative gluon exchange between the quark pair and a comoving color field. Such scattering can flip the spin and color of the quarks to create a non-vanishing overlap with the wave function of physical quarkonium. Several observed features that are difficult to understand in current models find simple explanations. Transverse gluon exchange produces unpolarized J/ψ's, the χc1 and χc2 states are produced at similar rates, and the anomalous dependence of the J/ψ cross section on the nuclear target size can be qualitatively understood.

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Section: The P -Wave Quarkonium Cross Sectionssupporting

confidence: 83%

Section: B Summarysupporting

confidence: 79%

Quarkonium production through hard comover scattering

Hoyer

Peigné

1999

Phys. Rev. D

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“…The ratios reported here are somewhat higher than the model for p T > 2 GeV/c, but the data's limited statistical precision and significant theoretical error bands preclude any firm conclusions. Comparison of world data on the ratio of ψ(2S)/ψ(1S) mesons in dilepton decays [21,29,[36][37][38][39][40][41][42].…”

Section: Resultsmentioning

confidence: 99%

Measurement of the relative yields of ψ(2S) to ψ(1S) mesons produced at forward and backward rapidity in
Adare¹,
Aidala²,
Ajitanand³
et al. 2017
Phys. Rev. C
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Measurement of the relative yields of ψ(2S) to ψ(1S) mesons produced at forward and backward rapidity in p+p, p+Al, p+Au, and The PHENIX Collaboration has measured the ratio of the yields of ψ(2S) to ψ(1S) mesons produced in p+p, p+Al, p+Au, and 3 He+Au collisions at √ s N N = 200 GeV over the forward and backward rapidity intervals 1.2 < |y| < 2.2. We find that the ratio in p+p collisions is consistent with measurements at other collision energies. In collisions with nuclei, we find that in the forward (p-going or 3 He-going) direction, the relative yield of ψ(2S) mesons to ψ(1S) mesons is consistent with the value measured in p+p collisions. However, in the backward (nucleus-going) direction, the ψ(2S) is preferentially suppressed by a factor of ∼2. This suppression is attributed in some models to breakup of the weakly-bound ψ(2S) through final state interactions with comoving particles, which have a higher density in the nucleus-going direction. These breakup effects may compete with color screening in a deconfined quark-gluon plasma to produce sequential suppression of excited quarkonia states.

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“…Suppression of J=c particles was actually observed in several experiments at the Super Proton Synchrotron [2] and the Relativistic Heavy Ion Collider [3]. Here, not only J=c but also c and c 0 states contribute to the total yield of J=c [4]. To investigate properties of these charmonia in the deconfinement phase, hadronic spectral functions are studied at zero and finite temperatures.…”

Section: Introductionmentioning

confidence: 99%

Charmonium spectral functions with the variational method in zero and finite temperature lattice QCD

et al. 2011

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We propose a method to evaluate spectral functions on the lattice based on a variational method. On a lattice with a finite spatial extent, spectral functions consist of discrete spectra only. Adopting a variational method, we calculate the locations and the heights of spectral functions at low-lying discrete spectra. We first test the method in the case of analytically solvable free Wilson quarks at zero and finite temperatures and confirm that the method well reproduces the analytic results for low-lying spectra. We find that we can systematically improve the results by increasing the number of trial states. We then apply the method to calculate the charmonium spectral functions for S and P-wave states at zero-temperature in quenched QCD and compare the results with those obtained using the conventional maximum entropy method (MEM). The results for the ground state are consistent with the location and the area of the first peak in spectral functions from the MEM, while the variational method leads to a mass which is closer to the experimental value for the first excited state. We also investigate the temperature dependence of the spectral functions for S-wave states below and above T c . We obtain no clear evidences for dissociation of J=c and c up to 1:4T c .

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Production ofJ/ψ via ψ’ and χ decay in 300 GeV/cproton- andπ±-nucleon interactions

Cited by 97 publications

References 29 publications

Quarkonium production through hard comover scattering

Quarkonium production through hard comover scattering

Measurement of the relative yields of ψ(2S) to ψ(1S) mesons produced at forward and backward rapidity in
Adare¹,
Aidala²,
Ajitanand³
et al. 2017
Phys. Rev. C
Self Cite

Charmonium spectral functions with the variational method in zero and finite temperature lattice QCD

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Production ofJ/ψ via ψ’ and χ decay in 300 GeV/cproton- andπ±-nucleon interactions

Cited by 97 publications

References 29 publications

Quarkonium production through hard comover scattering

Quarkonium production through hard comover scattering

Measurement of the relative yields of ψ(2S) to ψ(1S) mesons produced at forward and backward rapidity in Adare1, Aidala2, Ajitanand3 et al. 2017Phys. Rev. CSelf Cite

Charmonium spectral functions with the variational method in zero and finite temperature lattice QCD

Contact Info

Product

Resources

About

Measurement of the relative yields of ψ(2S) to ψ(1S) mesons produced at forward and backward rapidity in
Adare¹,
Aidala²,
Ajitanand³
et al. 2017
Phys. Rev. C
Self Cite