Study of χ production properties at the cern intersecting storage rings

Kourkoumelis, C.; Resvanis, L. K.; Filippas, T. A.; Fokitis, E.; Cnops, A.M.; Iwata, S.; Palmer, R.B.; Rahm, D.; Řehák, P.; Smith, S. D.; Stumer, I.; Fabjan, C.; Fields, T.; Fowler, E.C.; Lissauer, D.; Mannelli, I.; Mouzourakis, P.; Nappi, A.; Willis, W.; Goldberg, M.

doi:10.1016/0370-2693(79)90364-2

Cited by 52 publications

(12 citation statements)

References 4 publications

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“…χ/ψ ∼ 4.5, and for appropriate ψ ′ production [39]. A general ballpark for the measured χ to J/ψ production ratio in pp is a factor of 4 − 5 [34,39] and our final results are rather insensitive to a choice in this range, since a decrease could easily be compensated by a small transition matrix element between J/ψ and χ.…”

Section: Minimum Bias: P+a and Comparison To Glaubermentioning

confidence: 68%

“…What can differentiate our calculation from the earlier models is the possibility of transitions between charmonium states dynamically in a nuclear environment. Certainly, the χ 1 , χ 2 and χ 3 states are produced considerably more copiously in basic pp collisions, with perhaps as high a ratio as χ/ψ = 4 − 5 [34], and they decay appreciably into J/ψ, with branching ratios in the range Γ b /Γ ∼ 12 − 25% [35]. The ψ ′ also feed some 57% into J/ψ.…”

Section: Coupled Channel Model For Charmoniummentioning

confidence: 99%

“…In this we use the coupled channel modeling, whose details we elaborate further now. The relative production of the different charmonium states is taken so as to reproduce the pp data from the ISR [34] for the χ to J/ψ ratio, i.e. χ/ψ ∼ 4.5, and for appropriate ψ ′ production [39].…”

Section: Minimum Bias: P+a and Comparison To Glaubermentioning

confidence: 99%

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J/ψ suppression in heavy ion collisions at the CERN SPS

Kahana¹,

Kahana

1999

Progress in Particle and Nuclear Physics

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We reexamine the production of J/ψ and other charmonium states for a variety of target-projectile choices at the SPS, in particular for the interesting comparison between S+U at 200 GeV/c and Pb+Pb at 158 GeV/c as observed in the experiments NA38 and NA50 respectively. For this study we use a newly constructed cascade code LUCIFER II, which yields acceptable descriptions of both hard and soft processes, specifically Drell-Yan and meson production. This code divides the ion-ion collision into an initial phase involving hard interactions of the original nucleons and no soft energy loss, followed after the meson formation time by a 'normal' low energy cascade among the secondary particles. The modeling of the charmonium states differs from that of earlier workers in its unified treatment of the hidden charm meson spectrum, which is introduced from the outset as a set of coupled states ψ, χ i , ψ ′ . The result is a description of the NA38 and NA50 data in terms of a conventional, hadronic picture. The apparently anomalous suppression found in the most massive Pb+Pb system arises in the present simulation from three sources: destruction in the initial nucleon-nucleon cascade phase, use of coupled channels to exploit the larger breakup in the less bound χ i and ψ ′ states, and comover interaction in the final low energy phase.

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Section: Minimum Bias: P+a and Comparison To Glaubermentioning

confidence: 68%

Section: Coupled Channel Model For Charmoniummentioning

confidence: 99%

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J/ψ suppression in heavy ion collisions at the CERN SPS

Kahana¹,

Kahana

1999

Progress in Particle and Nuclear Physics

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“…Statistical and systematic errors were quadratically summed. Figure 26 compares the feed-down fraction obtained from our χ c → J/ψ + γ measurement with other experiments over a broad range of collision energy and x F , as well as over many different colliding species [73,[77][78][79][80][81][82][83][84]. The value measured in this work, F J/ψ χc = 32 ± 9%, is consistent with the world average of 25 ± 5 % after accounting for A dependencies in the fixed target experiments [76] 4 .…”

Section: B Total Cross Section Of Inclusive J/ψmentioning

confidence: 99%

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Adare¹,

Afanasiev²,

Aidala³

et al. 2012

Phys. Rev. D

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We report on charmonium measurements [J/ψ (1S), ψ ′ (2S), and χc (1P)] in p+p collisions at √ s = 200 GeV. We find that the fraction of J/ψ coming from the feed-down decay of ψ ′ and χc in the midrapidity region (|y| < 0.35) is 9.6 ± 2.4% and 32 ± 9%, respectively. We also present the pT and rapidity dependencies of the J/ψ yield measured via dielectron decay at midrapidity (|y| < 0.35) and via dimuon decay at forward rapidity (1.2 < |y| < 2.2). The statistical precision greatly exceeds that reported in our previous publication [Phys. Rev. Lett. 98, 232002 (2007)]. The new results are compared with other experiments and discussed in the context of current charmonium production models.

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“…where A and B represents the colliding particles, in this case π − and p, and Br is the branching fraction of the particles to decay into a J/Ψ meson. The measured ratios are collected from [50][51][52][53][54][55] and the comparison with the model calculations at different collision energies are shown in Tables 1 and 2, where a really good match with the data is achieved. This allows us to calculate the full energy dependence of the direct production of these states and put it into our transport simulations.…”

Section: Resultsmentioning

confidence: 92%

Charmed and bottomed hadronic cross sections from a statistical model

Balassa

Wolf

2020

Eur. Phys. J. A

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In this work, we extended our statistical model with charmed and bottomed hadrons, and fit the quark creational probabilities for the heavy quarks, using low energy inclusive charmonium and bottomonium data. With the finalized fit for all the relevant types of quarks (up, down, strange, charm, bottom) at the energy range from a few GeV up to a few tens of GeV’s, the model is now considered complete. Some examples are also given for proton–proton, pion–proton, and proton–antiproton collisions with charmonium, bottomonium, and open charm hadrons in the final state.

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Study of χ production properties at the cern intersecting storage rings

Cited by 52 publications

References 4 publications

J/ψ suppression in heavy ion collisions at the CERN SPS

J/ψ suppression in heavy ion collisions at the CERN SPS

Ground and excited state charmonium production inp+pcollisions ats=200 GeV

Charmed and bottomed hadronic cross sections from a statistical model

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