Summary
Experimental data on low-energy experiments (elastic scattering) and high-energy experiments (inclusive and semi-inclusive reactions) are analysed in order to get the form factors of the nucleons in interaction with the neutral weak current. The obtained values areG n.c.,pE (0)=−0.06±0.14,G n.c.,pM (0)=0.91±0.14,G n.c.,pA (0)=0.58±0.05,G n.c.,nE (0)=−0.78±0.17,G n.c.,nM (0)=−1.78±0.30,G n.c.,nA (0)=−0.57±0.09. Comparison with gauge model predictions selects Weinberg-Salam (with sin2 θw=0.255±0.025), Mohapatra-Sidhu and Lee-Weinberg models.
Riassunto
Si analizzano i dati sperimentali su esperimenti a bassa energia (scattering elastico) ed esperimenti ad alta energia (reazioni inclusive e seminclusive) per ottenere i fattori di forma dei nucleoni in interazione con la corrente neutra debole. Si ottengono i valoriG n.c.,pE (0)=−0.06±0.14,G n.c.,pM (0)=0.91±0.14,G n.c.,p.A (0)=0.58±0.05,G n.c.,nE (0)=−0.78±0.17,G n.c.,nM (0)=−1.78±0.30,G n.c.,nA (0)=−0.57±0.09. Il confronto con le previsioni dei modelli di gauge seleziona i modelli di Weinberg-Salam (con sin2 θw=0.255±0.025), Mohapatra-Sidhu e Lee-Weinberg.
Резюме
С целью получения форм-факторов нуклонов при взаимодействии с нейтральным слабым током анализируются экспериментальные данные по экспериментам при низких энергиях (упругое рассеяние) и по экспериментам при высоких энергиях (инклюзивные и полу-инклюзивные реакции). Полученные результаты представляют:G n.c.,pE (0)=−0.06±0.14,G n.c.,pM (0)=0.91±0.14,G n.c.,pA (0)=0.58±0.05,G n.c.,nE (0)=−0.78±0.17,G n.c.,nM (0)=−1.78±0.30,G n.c.,nA (0)=−0.57±0.09. Сравнение с предсказаниями калибровочных моделей выбирает модели Вейнберга-Салама (с sin2 θw=0.255±0.025), Мохапатра-Сидхи и Ли-Вейнберга.
Similar content being viewed by others
References
J. Leite Lopes: inWeak Currents (International School of Elementary-Particle Physics (Basko Polye, Makarska, Yugoslavia, September 1975)), published by the Centre de Recherches Nucléaires, Strasbourg (1975).
E. B. Hughes, T. A. Griffy, M. R. Yearian andR. Hofstadter:Phys. Rev.,139, 458 (1965).
D. H. Perkins:Review of neutrino experiments, inProceedings of the 1975 International Symposium on Lepton and Photon Interactions at High Energies, edited byW. T. Kirk (Stanford, Cal., 1975), p. 571;F. Sciulli: inProceedings of the Topical Conference on Neutrino Physics at Accelerators, edited byE. C. Fowler (Oxford, 1978), p. 405.
H. H. Williams: inProceedings of the Topical Conference on Neutrino Physics at Accelerators, edited byE. C. Fowler (Oxford, 1978), p. 314.
W. Lee, E. Haddry, N. Sippach, P. Sokolsky, L. Teig, A. Bross, T. Chapin, L. Nodulman, T. O'Halloran, C. Y. Pang, K. Goulianos andL. Litt:Phys. Rev. Lett.,37, 186 (1976).
D. Cline, A. Entenberg, W. Kuzanecki, A. K. Mann, D. D. Reeder, C. Rubbia, J. Strait, L. Sulak andH. H. Williams:Phys. Rev. Lett.,37, 252, 648 (1976).
G. M. Cochard andA. Ichola:Lett. Nuovo Cimento,23, 327 (1978).
J. J. Sakurai: inProceedings of the Topical Conference on Neutrino Physics at Accelerators, edited byE. C. Fowler (Oxford, 1978), p. 338.
A. Entenberg, J. Horstkotte, K. Kozanecki, A. K. Mann, C. Rubbia, J. Strait, L. Sulak, P. Wanderer andH. H. Williams:Phys. Rev. Lett.,42, 1198 (1979).
L. F. Abbott andR. M. Barnett:Phys. Rev. Lett.,40, 1303 (1978);Phys. Rev. D,18, 3214 (1978);A. J. Buras andK. J. F. Gaemers:Phys. Lett. B,71, 106 (1977);Nucl. Phys. B,132, 249 (1978);M. Holder, J. Knobloch, J. May, H. P. Paar, P. Palazzi, F. Ranjard, D. Schlatter, J. Steinberger, H. Suter, H. Wahl, S. Whitaker, E. G. H. Williams, F. Eisele, C. Geweniger, K. Kleinknecht, G. Spahn, H. J. Willutzki, W. Durth, F. Dydak, V. Hepp, K. Tittel, J. Wotschack, P. Bloch, B. Devaux, M. Grimm, J. Maillard, B. Peyaud, J. Rander, A. Savoy-Navarro, R. Turlay andF. L. Navarria:Phys. Lett. B,72, 254 (1977).
P. Q. Hung:Phys. Rev. d,17, 1893 (1978).
I. Liede andM. Ross:Nucl. Phys. B 167, 397 (1980).
P. Q. Hung andJ. J. Sakurai:Phys. Lett. B,72, 208 (1977).
L. M. Seghal in“Neutrino 78”, Proceedings of the International Conference on Neutrino Physics and Astrophysics (Lafayette, Ind., 1978), p. 253.
H. Kluttig, J. G. Morfin andW. Von Doninck:Phys. Lett. B,71, 446 (1977).
P. C. Bosetti, H. Deden, M. Deutschmann, P. Fritze, H. Grassler, F. J. Hasert, J. Morfin, R. Schulte, K. Schultze, H. Seyfert, K. Bockmann, H. Emans, C. Geich-Gimbel, R. Hartmann, A. Keller, T. P. Kokott, W. Meinke, B. Nellen, R. Pech, D. C. Cundy, J. Figiel, A. Grant, D. Haidt, P. O. Hulth, G. J. Jones, H. Klein, D. J. Kocher, D. R. O. Morrison, E. Pagiola, L. Pape, C. Peyrou, V. Peterson, P. Porth, P. Schmidt, W. G. Scott, H. Wachsmuth, K. L. Wernhard, S. Banerjee, K. W. J. Barnham, R. Beuselinck, I. Butterworth, E. F. Clayton, D. B. Miller, K. J. Powell, C. L. Davis, P. Grossmann, R. McGow, J. H. Hulvey, G. Myatt, D. H. Perkins, R. Pons, D. Radojicic, P. Renton, B. Saitta, V. Stenger, V. Baruzzi, M. Bloch, M. De Beer, W. Hart, Y. Sacquin, B. Tallini andD. Vignaud:Phys. Rev. Lett. B,76, 505 (1978);H. Deden, M. Deutschmann, P. Fritze, H. Grassler, F. J. Hasert, J. Morfin, R. Schulte, K. Schultze, H. Seyfert, H. Emans, C. Geich-Gimbel, R. Hartmann, A. Keller, T. P. Kokott, B. Nellen, R. Pech, D. C. Cundy, J. Figiel, A. Grant, D. Haidt, P. O. Hulth, D. J. Kocher, D. R. O. Morrison, E. Pagiola, L. Pape, C. Peyrou, V. Peterson, P. Porth, P. Schmidt, W. G. Scott, H. Wachsmuth, K. L. Wernhard, K. W. J. Barnham, R. Beuselinck, E. F. Clayton, D. B. Miller, K. L. Powell, C. L. Davis, P. Grossmann, R. McGow, J. H. Mulvey, G. Myatt, D. H. Perkins, R. Pons, D. Radojicic, P. Renton, S. Saitta, V. Stenger, V. Baruzzi, M. Bloch, Y. Sacquin, B. Tallini andD. Vignaud:Nucl. Phys. B.149, 1 (1979).
M. Claudson, E. A. Paschos, J. Strait andL. R. Sulak:Phys. Rev. D,19, 1373 (1979).
E. Monsay:Phys. Rev. D,18, 2277 (1978).
S. Weinberg:Phys. Rev. Lett.,19, 1264 (1967);Abdus Salam: inProceedings of the VIII Nobel Symposium (Stockholm, 1968).
V. Barger andD. V. Nanopoulos:Nucl. Phys. B,24, 426 (1977); names like “world product”, “vectorlike”, “0–1” come from this reference.F. Gursey andP. Sikivie:Phys. Rev. Lett.,36, 775 (1977).
R. N. Mohapatra andD. P. Sidhu:Phys. Rev. D,16, 2843 (1977).
P. Langacker andG. Segre:Phys. Rev. Lett.,39, 259 (1977).
B. W. Lee andS. Weinberg:Phys. Rev. Lett.,38, 1237 (1977).
A review on the constraints on the parameters of the gauge models can be found inP. Langacker andD. P. Sidhu:Phys. Lett. B,74, 233 (1978).
Author information
Authors and Affiliations
Additional information
Traduzione a cura della Redazione.
Перевебено ребакцией.
Rights and permissions
About this article
Cite this article
Cochard, G.M., Mouafakou, I.A. Toward the determination of the neutral weak form factors of the nucleons. Nuov Cim A 65, 239–254 (1981). https://doi.org/10.1007/BF02902137
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02902137