scholarly journals Excited nucleon spectrum and structure studies with CLAS and CLAS12

2020 ◽  
Author(s):  
Keyword(s):  
Nucleon Spectrum

scholarly journals NUCLEON RESONANCES AND GPDS IN AdS/QCD

2014 ◽  
Vol 26 ◽  
pp. 1460066 ◽  
Author(s):  
ALFREDO VEGA ◽  
IVAN SCHMIDT ◽  
THOMAS GUTSCHE ◽  
VALERY E. LYUBOVITSKIJ
Keyword(s):  
Roper Resonance ◽  
Wall Model ◽  
Nucleon Resonances ◽  
Soft Wall Model ◽  
Nucleon Spectrum ◽  
Soft Wall

We discuss an holographic soft wall model to describe nucleon properties. We pay special attention to nucleon spectrum, GPDs in the skewness case for nucleons and electroproduction of the N (1440) Roper resonance in soft-wall AdS/QCD.

Correlation between the sea level muon spectrum and the primary nucleon spectrum using the Cocconi–Koester–Perkins model

1979 ◽  
Vol 57 (7) ◽  
pp. 921-925 ◽  
Author(s):  
A. K. Chakrabarti ◽  
A. K. Das ◽  
A. K. De
Keyword(s):  
Sea Level ◽  
Pion Production ◽  
Spectral Shape ◽  
Muon Spectrum ◽  
Proton Proton ◽  
Absolute Value ◽  
Nucleon Spectrum ◽  
Scaling Models ◽  
The Mean ◽  
Good Agreement

Using the recent ISR data of proton–proton interactions on the inclusive production of pions and nucleons, realistic values of the mean pion inelasticity Kπ and the mean nucleon inelasticity KT have been estimated. These values have been used for the derivation of the sea level differential muon spectrum from the primary nucleon spectrum and vice versa using the CKP model as an extension of the work presented in an earlier article. It is found that none of the measured primary nucleon spectra of Ryan, Ormes, and Balasubrahmanyan and Grigorov, Rapoport, and Shestoperov fit any of the precisely measured muon spectra of Ayre, Baxendale, Hume, Nandi, Thompson, and Whalley and Allkofer, Carstensen, and Dau in spectral shape or the absolute value. On the other hand good agreement between the derived muon spectra and the spectra of Allkofer et al. and Ayre et al. is found if the primary nucleon spectra of the forms, N(Ep) = (1.38 ± 0.08)Ep−2.59 and N(Ep) = (1.00 ± 0.10)Ep−2.55, respectively, are assumed. The first form is comparable with that obtained by Brooke, Hayman, Kamiya, and Wolfendale following more approximate but similar procedure. It is also not unjustified when compared with the measured primary all nuclei spectrum of Grigorov et al. in the light of suggestions made by Ellsworth, Ito, Macfall, Siohan, Streitmatter, Tonwar, Vishwanath, Yodh, and Balasubrahmanyan. By comparing the pion production spectra derived from the same primary nucleon spectrum but using the CKP and the scaling models, it is concluded that the results are sensitive to the model assumed for the collisions.

scholarly journals MEM Analysis of the QCD Sum Rule and its Application to nucleon spectrum

2013 ◽  
Author(s):  
Keisuke Ohtani ◽  
Philipp Gubler ◽  
Makoto Oka
Keyword(s):  
Sum Rule ◽  
Nucleon Spectrum

Sea level muon spectrum derived from the Goddard Space Flight Centre measured nucleon spectrum using the Cocconi–Koester–Perkins model

1977 ◽  
Vol 55 (7-8) ◽  
pp. 629-631
Author(s):  
Kalpana Sarkar ◽  
D. P. Bhattacharyya ◽  
D. Basu
Keyword(s):  
Energy Range ◽  
Sea Level ◽  
Energy Dependence ◽  
Space Flight ◽  
Muon Spectrum ◽  
Goddard Space ◽  
Pion Energy ◽  
Nucleon Spectrum

The sea level muon spectrum is estimated from the Goddard Space Flight Centre group measured nucleon spectrum by using the model of Cocconi, Koester, and Perkins (CKP). The derived muon spectrum agrees well with the magnetic spectrograph data of Ayre, Baxendale, Hume, Nandi, Thompson, and Whalley when the energy dependence of pion inelasticity (Kπ) in the CKP model is assumed in the pion energy range 10–500 GeV. Above 50 GeV pion energy (Eπ) the pion inelasticity follows the relation Kπ = 0.1 ln Eπ.

The energy spectrum of heavy nuclei above 10 GeV/nucleon

1968 ◽  
Vol 46 (10) ◽  
pp. S651-S652
Author(s):  
M. Koshiba ◽  
E. Suda ◽  
F. Takasaki
Keyword(s):  
Energy Spectrum ◽  
Total Energy ◽  
Experimental Observation ◽  
Preliminary Data ◽  
Cosmic Radiation ◽  
Heavy Nuclei ◽  
Nucleon Spectrum ◽  
Primary Cosmic Radiation

An experimental observation is made of the energy spectrum of heavy nuclei in the primary cosmic radiation using a large emulsion stack. The preliminary data so far accumulated indicate an exponent of 1.60 to 1.65 for the integral total-energy-per-nucleon spectrum.

Energy spectra of secondary gamma rays at different atmospheric depths

1979 ◽  
Vol 57 (4) ◽  
pp. 582-585 ◽  
Author(s):  
D. P. Bhattacharyya ◽  
R. K. Roychoudhury
Keyword(s):  
Storage Ring ◽  
Spectral Range ◽  
Gamma Rays ◽  
Space Flight ◽  
Gamma Ray ◽  
Energy Spectra ◽  
Source Spectrum ◽  
Emulsion Chamber ◽  
Intersecting Storage Ring ◽  
Nucleon Spectrum

The CERN Intersecting Storage Ring (ISR) data for p + p → π0 + X inclusive reaction have been used to derive the spectrum of secondary gamma rays at the top of the atmosphere. The measured primary nucleon spectrum of the Goddard Space Flight Group has been taken as a nucleon source spectrum. Using the cascade theory, the gamma ray spectra at the atmospheric depths 540, 650, and 735 g cm−2 have been calculated. The results are approximately in accord with the emulsion chamber data at Mt. Chacaltaya, Mt. Norikura, and Mt. Fuji in the spectral range 0.2–4 TeV.

MUON FLUXES DERIVED FROM THE DIRECTLY MEASURED PRIMARY COSMIC RAY ELEMENTAL SPECTRA

1996 ◽  
Vol 11 (30) ◽  
pp. 2427-2433
Author(s):  
MALA MITRA ◽  
PRATIBHA PAL ◽  
D.P. BHATTACHARYYA
Keyword(s):  
Cosmic Ray ◽  
Upper Atmosphere ◽  
Energy Spectra ◽  
Muon Energy ◽  
Spectral Indices ◽  
Muon Spectrum ◽  
Indirect Measurements ◽  
Large Zenith Angle ◽  
Nucleon Spectrum ◽  
The Individual

The muon energy spectra at 0° and 89° have been estimated from the decay of nonprompt and prompt mesons created by the individual elemental primary cosmic ray groups during nucleus-air collisions in the upper atmosphere and the results are found to be fairly comparable with the measured muon fluxes obtained from the direct magnetic spectrograph results in Refs. 2–4, and also from the underground indirect measurements in Refs. 5–10. The muon spectrum derived from the single slope primary nucleon spectrum with a constant spectral index of value −2.73 is only slightly different from the present result for energies below 20 TeV. The present muon spectra at large zenith angle exhibit steeper spectral indices when compared to the expected results obtained from primary elemental groups by Parente et al.

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