Naslov
Parity-violating inelastic electron-proton scattering at low Q2 above the resonance region

Autori
Androić, D. ; Armstrong, D. S. ; Asaturyan, A. ; Bartlett, K. ; Beminiwattha, R. S. ; Benesch, J. ; Benmokhtar, F. ; Birchall, J. ; Carlini, R. D. ; Cornejo, J. C. ; Covrig Dusa, S. ; Dalton, M. M. ; Davis, C. A. ; Deconinck, W. ; Dowd, J. F. ; Dunne, J. A. ; Dutta, D. ; Duvall, W. S. ; Elaasar, M. ; Falk, W. R. ; Finn, J. M. ; Gal, C. ; Gaskell, D. ; Gericke, M. T. W. ; Grames, J. ; Gray, V. M. ; Grimm, K. ; Guo, F. ; Hoskins, J. R. ; Jones, D. ; Jones, M. K. ; Jones, R. T. ; Kargiantoulakis, M. ; King, P. M. ; Korkmaz, E. ; Kowalski, S. ; Leacock, J. ; Leckey, J. P. ; Lee, A. R. ; Lee, J. H. ; Lee, L. ; MacEwan, S. ; Mack, D. ; Magee, J. A. ; Mammei, J. ; Martin, J. W. ; McHugh, M. J. ; Meekins, D. ; Mesick, K. E. ; Michaels, R. ; Micherdzinska, A. ; Mkrtchyan, A. ; Mkrtchyan, H. ; Morgan, N. ; Narayan, A. ; Ndukum, L. Z. ; Nelyubin, V. ; van Oers, W. T. H. ; Owen, V. F. ; Page, S. A. ; Pan, J. ; Paschke, K. D. ; Phillips, S. K. ; Pitt, M. L. ; Radloff, R. W. ; Ramsay, W. D. ; Roche, J. ; Sawatzky, B. ; Seva, T. ; Shabestari, M. H. ; Silwal, R. ; Simicevic, N. ; Smith, G. R. ; Solvignon, P. ; Spayde, D. T. ; Subedi, A. ; Suleiman, R. ; Tadevosyan, V. ; Waidyawansa, B. ; Wang, P. ; Wells, S. P. ; Wood, S. A. ; Yang, S. ; Zang, P. ; Qweak Collaboration

Kolaboracija
Qweak Collaboration

Izvornik
Physical review. C (2469-9985) 101 (2020), 5; 055503, 13

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
three-body breakup, reaction cross section, helium-3

Sažetak
We report the first measurement of the ( e , e ′ p ) three-body breakup reaction cross sections in helium- 3 ( 3 He ) and tritium ( 3 H ) at large momentum transfer [ ⟨ Q 2 ⟩ ≈ 1.9 ( GeV / c ) 2 ] and x B > 1 kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40 ≤ p miss ≤ 500 MeV / c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with state-of-the-art ab initio calculations. Overall good agreement, within ± 20 % , is observed between data and calculations for the full p miss range for 3 H and for 100 ≤ p miss ≤ 350 MeV / c for 3 He . Including the effects of rescattering of the outgoing nucleon improves agreement with the data at p miss > 250 MeV / c and suggests contributions from charge- exchange (SCX) rescattering. The isoscalar sum of 3 He plus 3 H , which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire p miss range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of 500 MeV / c .

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA