Journal article
Authors list: Bashkanov, M.; Watts, D. P.; Kay, S. J. D.; Abt, S.; Achenbach, P.; Adlarson, P.; Afzal, F.; Ahmed, Z.; Akondi, C. S.; Annand, J. R. M.; Beck, R.; Biroth, M.; Borisov, N.; Braghieri, A.; Briscoe, W. J.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A.; Downie, E. J.; Drexler, P.; Fegan, S.; Fix, A.; Gardner, S.; Ghosal, D.; Glazier, D. I.; Gorodnov, I.; Gradl, W.; Gurevich, D.; Heijkenskjoeld, L.; Hornidge, D.; Huber, G. M.; Kashevarov, V. L.; Korolija, M.; Krusche, B.; Lazarev, A.; Livingston, K.; Lutterer, S.; MacGregor, I. J. D.; Manley, D. M.; Martel, P. P.; Miskimen, R.; Mornacchi, E.; Mullen, C.; Neganov, A.; Neiser, A.; Ostrick, M.; Otte, P. B.; Paudyal, D.; Pedroni, P.; Rostomyan, T.; Sokhoyan, V.; Spieker, K.; Steffen, O.; Strakovsky, I. I.; Strub, T.; Supek, I.; Thiel, A.; Thiel, M.; Thomas, A.; Usov, Yu. A.; Wagner, S.; Walford, N. K.; Wettig, J.; Wolfes, M.; Workman, R. L.; Zachariou, N.
Publication year: 2023
Journal: Physics Letters B
Volume number: 847
ISSN: 0370-2693
eISSN: 1873-2445
Open access status: Gold
DOI Link: https://doi.org/10.1016/j.physletb.2023.138283
Publisher: Elsevier
Abstract:
We report a first measurement of the double-polarisation observable, C-x', in pi(+) photoproduction off the proton. The C-x' double-polarisation observable represents the transfer of polarisation from a circularly polarised photon beam to the recoiling neutron. The MAMI circularly polarised photon beam impinged on a liquid deuterium target cell, with reaction products detected in the Crystal Ball calorimeter. Ancillary apparatus surrounding the target provided tracking, particle identification and determination of recoil nucleon polarisation. The C-x' observable is determined for photon energies 800-1400 MeV, providing new constraints on models aiming to elucidate the spectrum and properties of nucleon resonances. This is the first determination of any polarisation observable from the beam-recoil group of observables for this reaction. Inclusion of the new data in the database of the SAID partial wave analysis shifted the solution to a new global minima which, not only gives better agreement with the current data, but also improves the description of a range of other single and double polarisation observables for charged pion photoproduction.
Citation Styles
Harvard Citation style: Bashkanov, M., Watts, D., Kay, S., Abt, S., Achenbach, P., Adlarson, P., et al. (2023) Neutron polarisation transfer, Cx′, in π+ photoproduction off the proton, d(γ⊙, (n)over-right-arrowπ+)nspec, Physics Letters B, 847, Article 138283. https://doi.org/10.1016/j.physletb.2023.138283
APA Citation style: Bashkanov, M., Watts, D., Kay, S., Abt, S., Achenbach, P., Adlarson, P., Afzal, F., Ahmed, Z., Akondi, C., Annand, J., Beck, R., Biroth, M., Borisov, N., Braghieri, A., Briscoe, W., Cividini, F., Collicott, C., Costanza, S., Denig, A., ...Zachariou, N. (2023). Neutron polarisation transfer, Cx′, in π+ photoproduction off the proton, d(γ⊙, (n)over-right-arrowπ+)nspec. Physics Letters B. 847, Article 138283. https://doi.org/10.1016/j.physletb.2023.138283
Keywords
MAINZ; PHOTON; PHOTOPRODUCTION; SINGLE
