Nuclear mass number dependence of inclusive pion production by pions and protons at 4.3GeV/c

Ono, Masaaki; Kishiro, J.; Mikamo, S.; Kusumegi, Asao; Ishizuka, T.

doi:10.1016/0370-2693(79)91251-6

Cited by 6 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly optical models of shadowing in very low-energy nucleon-nucleus scattering predict α 0 = 2/3. This value is in agreement with results for low energy π production [28]. Coincidentally, the formula is also in agreement with the measured value of α for K, ρ, and ω production at low energy [29].…”

supporting

confidence: 91%

Fractal structure of near-threshold quarkonium production off cold nuclear matter

Bhaduri

Gupta

2013

Phys. Rev. C

View full text Add to dashboard Cite

We investigate near-threshold production of quarkonium resonances in cold nuclear matter through a scaling theory with two exponents which are fixed by existing data on near-threshold J/ψ production in proton-nucleus collisions. Interestingly, it seems possible to extend one of the multifractal dimensions to the production of other mesons in cold nuclear matter. The scaling theory can be tested and refined in experiments at the upcoming high-intensity FAIR accelerator complex in GSI.PACS numbers: 25.40. Ep,14.40.Pq,24.85.+p. TIFR/TH/13-09There are unexplored systematics for the production of quarkonia close to threshold. For the J/ψ, a few experimental studies were carried out in the days before the understanding of QCD was mature. Attention shifted to the high-energy frontier, since perturbative QCD turned out to be the tool appropriate to that region, and weakcoupling theory was applied successfully to higher-energy production of quarkonium in pA collisions [1][2][3][4]. However, the planned FAIR in GSI presents a grand opportunity for the study of near-threshold particle production in cold nuclear matter, and test and refine a scaling theory which is developed here. This is interesting for several reasons. First, as we argue here, testing the limits of such a scaling theory shows where the crossover between hadron and quark descriptions of matter lie. Second, this measurement can be used to test factorization where it cannot be proved, and therefore has implications on the understanding of CP violations. Third, a detailed understanding of cold nuclear effects in quarkonium production is important to tests of the formation of the QCD plasma in heavy-ion collisions. Finally, the discovery of scaling laws, which is our main result, is of fundamental interest since the exponents can define universality classes across very broad ranges of physical phenomena.The basic toolkit which we bring to this study is the modern understanding that the renormalization group is expressed via scaling. We wish to ascertain whether there is a dynamical symmetry of cold nuclear matter so that a small change in the amount of nuclear matter can be compensated for by a corresponding change in the energy of the probe. Invariance under such scaling would manifest itself in the form of exponents which are eigenvalues of renormalization group transformations [5]. These scaling exponents are also called fractal dimensions or anomalous dimensions. At high energies they can be computed in perturbation theory. Near the threshold of particle production, they have to be discovered in data and understood non-perturbatively. Discovery of scaling exponents, which is our main result, conversely implies the scaling symmetries.We are interested in the production of a quarkonium state, H, in pA collisions near the threshold energy √ S 0 , which is the minimum energy in the center of mass required to produce H. We follow the convention of writing the CM energy, √ S, in the equivalent pp system; for a fixed target configuration this means S = 2M p (E ...

show abstract

supporting

confidence: 91%

Fractal structure of near-threshold quarkonium production off cold nuclear matter

Bhaduri

Gupta

2013

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…The nuclear mass number dependence of the cross sections for the particle production is usually parameterized as σ(A) = σ 0 A α (1) * Electronic address: tsugu@riken.jp † Present Address: Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 378-8510, Japan ‡ Present Address: ICEPP, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan § Present Address: Physics Department, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan for a target nucleus with mass number A. When the collision energy √ s N N is sufficiently large, the parameter α in the production of light mesons like pions or ρ mesons is about 2/3 [8,9]. This can be interpreted by considering such productions to be dominated by primary collisions at the front surface of a target nucleus.…”

Section: Introductionmentioning

confidence: 99%

“…for a target nucleus with mass number A. When the collision energy √ s N N is sufficiently large, the parameter α in the production of light mesons like pions or ρ mesons is about 2/3 [8,9]. This can be interpreted by considering such productions to be dominated by primary collisions at the front surface of a target nucleus.…”

Section: Introductionmentioning

confidence: 99%

Nuclear mass number dependence of inclusive production of ω and ϕ mesons in 12 GeVp+Acollisions

et al. 2006

View full text Add to dashboard Cite

The inclusive production of ω and φ mesons is studied in the backward region of the interaction of 12 GeV protons with polyethylene, carbon, and copper targets. The mesons are measured in e + e − decay channels. The production cross sections of the mesons are presented as functions of rapidity y and transverse momentum pT . The nuclear mass number dependences (A dependences) are found to be A 0.710±0.021(stat)±0.037 (syst) for ω mesons and A 0.937±0.049(stat)±0.018(syst) for φ mesons in the region of 0.9 < y < 1.7 and pT < 0.75 GeV/c.

show abstract

A low-momentum π-μ channel at the KEK 12 GeV proton synchrotron

Shibata

Kobayashi

Numao

et al. 1981

Nuclear Instruments and Methods

View full text Add to dashboard Cite

Nuclear mass number dependence of inclusive pion production by pions and protons at 4.3GeV/c

Cited by 6 publications

References 4 publications

Fractal structure of near-threshold quarkonium production off cold nuclear matter

Fractal structure of near-threshold quarkonium production off cold nuclear matter

Nuclear mass number dependence of inclusive production of ω and ϕ mesons in 12 GeVp+Acollisions

A low-momentum π-μ channel at the KEK 12 GeV proton synchrotron

Contact Info

Product

Resources

About