scholarly journals Charmonium production inpp¯annihilation: Estimating cross sections from decay widths

2006 ◽  
Vol 73 (9) ◽  
Author(s):  
A. Lundborg ◽  
T. Barnes ◽  
U. Wiedner
Keyword(s):  
Cross Sections ◽  
Charmonium Production ◽  
Decay Widths

scholarly journals PSI TO N NBAR m

2011 ◽  
Vol 02 ◽  
pp. 193-197 ◽  
Author(s):  
T. BARNES
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Experimental Measurement ◽  
Meson Exchange ◽  
Recent Experimental Data ◽  
Final States ◽  
Pole Model ◽  
Charmonium Production ◽  
Input Information ◽  
Production Processes

In this invited talk I discuss two recent applications of charmonium (Ψ) decays to [Formula: see text] final states, where N is a nucleon and m is a light meson. There are several motivations for studying these decays: 1) They are useful for the study of N* spectroscopy; 2) they can be used to estimate cross sections for the associated charmonium production processes [Formula: see text], which PANDA plans to exploit in searches for charmonium hybrid exotics; and 3) they may allow the direct experimental measurement of NNm (meson-nucleon) strong couplings, which provide crucial input information for meson exchange models of the NN force. The latter two topics are considered in this talk, which will also compare results from a simple hadron pole model of these decays to recent experimental data.

scholarly journals Factorization in the model of unstable particles with continuous masses

Open Physics ◽  
2013 ◽  
Vol 11 (2) ◽  
Author(s):  
Vladimir Kuksa ◽  
Nikolay Volchanskiy
Keyword(s):  
Cross Sections ◽  
Factorization Method ◽  
Phenomenological Analysis ◽  
Specific Structure ◽  
Interacting Particles ◽  
Unstable Particles ◽  
Decay Widths ◽  
Intermediate Time ◽  
Exact Factorization

AbstractWe study processes with unstable particles in intermediate time-like states. It is shown that the amplitudes squared of such processes factor exactly in the framework of the model of unstable particles with continuous masses. Decay widths and cross sections can then be represented in a universal factorized form for an arbitrary set of interacting particles. This exact factorization is caused by specific structure of propagators in the model. We formulate the factorization method and perform a phenomenological analysis of the factorization effects. The factorization method considerably simplifies calculations while leading to compact and reasonable results.

scholarly journals Excited Muon Searches at the FCC-Based Muon-Hadron Colliders

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
A. Caliskan ◽  
S. O. Kara ◽  
A. Ozansoy
Keyword(s):  
Transverse Momentum ◽  
Cross Sections ◽  
Production Cross ◽  
Muon Decay ◽  
Hadron Colliders ◽  
Final State ◽  
Decay Widths ◽  
Muon Production ◽  
Pseudorapidity Distributions ◽  
Excited Muons

We study the excited muon production at the FCC-based muon-hadron colliders. We give the excited muon decay widths and production cross-sections. We deal with the μp→μ⋆q→μγq process and plot the transverse momentum and normalized pseudorapidity distributions of final state particles to define the kinematical cuts best suited for discovery. By using these cuts, we get the mass limits for excited muons. It is shown that the discovery limits obtained on the mass of μ⋆ are 2.2, 5.8, and 7.5 TeV for muon energies of 63, 750, and 1500 GeV, respectively.

scholarly journals Charmonium Production in Fermilab E789

1997 ◽  
Vol 12 (22) ◽  
pp. 3827-3836 ◽  
Author(s):  
Daniel M. Kaplan
Keyword(s):  
Perturbative Qcd ◽  
Cross Sections ◽  
Differential Cross ◽  
Production Cross ◽  
Differential Cross Sections ◽  
Color Singlet ◽  
Charmonium Production ◽  
Detailed Understanding ◽  
Color Octet ◽  
Beauty Production

Using a sample of > 105 J/ψ → μ+ μ- decays, Fermilab experiment 789 has studied production of J/ψ and ψ′ in 800 GeV proton-nucleon collisions. Differential cross sections and nuclear dependences have been measured for charmonium as well as for charm and beauty production. While charm and beauty production are consistent with perturbative QCD calculations, charmonium cross sections exceed the predictions of the color-singlet model by large factors, suggesting that additional mechanisms (such as color-octet production) may play important roles. Nuclear dependences of production cross sections may offer a new tool for the detailed understanding of charmonium production.

scholarly journals Study on the Resonant Parameters of Y (4220) and Y (4390)

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Jielei Zhang ◽  
Limin Yuan ◽  
Rumin Wang
Keyword(s):  
Cross Sections ◽  
Leptonic Decay ◽  
Decay Widths ◽  
The Cross ◽  
Lower Limits

Many vector charmonium-like states have been reported recently in the cross sections of e+e-→ωχc0, π+π-hc, π+π-J/ψ, π+π-ψ(3686), and π+D0D⁎-+c.c. To better understand the nature of these states, a combined fit is performed to these cross sections by using three resonances Y(4220), Y(4390), and Y(4660). The resonant parameters for the three resonances are obtained. We emphasize that two resonances Y(4220) and Y(4390) are sufficient to explain these cross sections below 4.6 GeV. The lower limits of Y(4220) and Y(4390)’s leptonic decay widths are also determined to be (36.4±2.0±4.2) and (123.8±6.5±9.0) eV.

Charmonium Production in 800 GeV/c p-Si Interactions

1997 ◽  
Vol 12 (22) ◽  
pp. 3847-3855
Author(s):  
Karla Hagan
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Fixed Target ◽  
Charmonium Production

Charmonium results are presented from Fermilab Experiment 771, proton-silicon interactions at [Formula: see text] with a fixed target spectrometer and dimuon trigger. Total and differential cross sections for J/ψ and ψ(2S) will be discussed, as well as a preliminary result on χ production.

scholarly journals Double Charmonium Productions in Electron-Positron Annihilation Using Bethe-Salpeter Approach

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Hluf Negash ◽  
Shashank Bhatnagar
Keyword(s):  
Positron Annihilation ◽  
Cross Sections ◽  
Production Cross ◽  
Center Of Mass ◽  
Theoretical Models ◽  
Final States ◽  
Charmonium Production ◽  
Center Of Mass Energy ◽  
Electron Positron Annihilation ◽  
Electron Positron

We calculate the double charmonium production cross-section within the framework of 4×4 Bethe-Salpeter Equation in the electron-positron annihilation, at center of mass energy s=10.6GeV, that proceeds through the exchange of a single virtual photon. In this calculation, we make use of the full Dirac structure of 4D BS wave functions of these charmonia, with the incorporation of all the Dirac covariants (both leading and subleading). The calculated cross-sections for the double charmonium productions for final states, (J/Ψ,ηc), (Ψ′,ηc), (J/Ψ,ηc′), and (Ψ′,ηc′), are close to experimental data and in broad agreement with results of other theoretical models.

Tools for Calculation

2019 ◽  
pp. 95-110
Author(s):  
Michael E. Peskin
Keyword(s):  
Elementary Particle ◽  
Phase Space ◽  
Cross Sections ◽  
Feynman Diagrams ◽  
Decay Widths ◽  
Relativistic Phase

This chapter discusses the calculation of quantities observable in elementary particle reactions — cross sections and partial decay widths. It introduces relativistic phase space. It introduces Feynman diagrams and describes their role in visualizing elementary particle reactions.

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