Measurement of the proton-carbon bremsstrahlung cross sections at 2.135 MeV: Testing soft-photon approximations

Yan, Dong; Lesser, P.M.S.; Liou, M. K.; Trail, C. C.

doi:10.1103/physrevc.45.331

Cited by 5 publications

(10 citation statements)

References 17 publications

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“…That is, when the process is resonance dominated, M ' " is the correct choice. Some well-known examples are the~p y -processes near the b(1232) resonance [9], the p' Cy process near either the 1.7-MeV resonance or the 461-keV resonance [7], and the p' Oy process near the 2.66-MeV resonance [8]. These radiative resonant scattering processes have been systematically studied both experimentally and theoretically.…”

Section: -Mev Resonances)mentioning

confidence: 99%

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Anatomy of the soft photon approximation in hadron-hadron bremsstrahlung

1993

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A modified Low procedure for constructing soft-photon amplitudes has been used to derive two general soft-photon amplitudes, a two-s -two-t special amplitude M"' " and a two-u -two-t special amplitude M"" ", where s, t, and u are the Mandelstam variables. M"' " depends only on the elastic T matrix evaluated at four sets of (s, t) fixed by the requirement that the amplitude be free of derivatives (BT/Bs and/or BT/Bt). Likewise M"""" depends only on the elastic T matrix evaluated at four sets of (u, t) also fixed by the requirement that the amplitude M"u "be free of derivatives (BT/Bu and/or AT/tjt). In -TsTts deriving these two amplitudes, we imposed the condition that M"' " and M " " reduce to M"and -Tu Tts~. . . . -Ts TtsM", respectively, their tree-level approximations. The amplitude M"represents photon emission from a sum of one-particle t-channel exchange diagrams and one-particle s-channel exchange dia--Tu Tts grams, while the amplitude M"represents photon emission from a sum of one-particle t-channel exchange diagrams and one-particle u-channel exchange diagrams. The precise expressions for M "' " and

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Section: -Mev Resonances)mentioning

confidence: 99%

“…Three separate experimental groups have measured the p ' Cy cross sections and then used these cross sections to extract nuclear time delays [7]. (iv) Testing theoretical models and calculational approximation, and calculations based on the soft-photon approximation are classified as model independent.…”

Section: -Ts Ttsmentioning

confidence: 99%

Anatomy of the soft photon approximation in hadron-hadron bremsstrahlung

1993

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“…The amplitudes given by Eqs. ( 8), (9), and (11) of Ref. [1] cannot be rigorously "derived" for the third case (iii); they were improperly "generalized" by the authors.…”

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“…Because TuTts and TETAS amplitudes effectively describe different bremsstrahlung processes, the theoretical constraints to be imposed upon them can differ. For example, the TETAS amplitudes were shown to be the most successful in describing bremsstrahlung pro-cesses near a resonance [5][6][7][8][9]. They satisfy an important criterion which was neglected in Ref.…”

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Comment on “Validity of certain soft photon amplitudes”

et al. 1999

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Proton-proton bremsstrahlung calculation: Studies of the off-shell proton electromagnetic vertex and of pseudoscalar vs pseudovectorπNcouplings

Liou

Schreiber

1998

Phys. Rev. C

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The proton-proton bremsstrahlung (pp␥) process has been used as a tool to study the problems related to both the off-shell proton electromagnetic vertex and pseudoscalar ͑ps͒-pseudovector ͑pv͒ N coupling. We have developed an approach which can be applied to investigate the two problems together. We show that ͑i͒ the analyzing powers calculated using the on-shell p␥p vertex, with ps or pv coupling, yield very poor results for most of the cases with small proton scattering angles at 280 MeV, ͑ii͒ the calculations using the off-shell p␥p vertex and ps coupling in most cases produce cross sections which fail to fit the TRIUMF data at 200 and 280 MeV, and ͑iii͒ the data for both cross sections and analyzing powers in the energy region between 157 and 280 MeV can only be consistently described by the calculations using the off-shell p␥p vertex and pv coupling. Thus our results indicate that the off-shell p␥p vertex must be used in relativistic pp␥ calculations and the pseudovector coupling is the best choice for the N vertex. More accurate data are needed for further study of the problems.

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Measurement of the proton-carbon bremsstrahlung cross sections at 2.135 MeV: Testing soft-photon approximations

Cited by 5 publications

References 17 publications

Anatomy of the soft photon approximation in hadron-hadron bremsstrahlung

Anatomy of the soft photon approximation in hadron-hadron bremsstrahlung

Comment on “Validity of certain soft photon amplitudes”

Proton-proton bremsstrahlung calculation: Studies of the off-shell proton electromagnetic vertex and of pseudoscalar vs pseudovectorπNcouplings

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