Pregled bibliografske jedinice broj: 192067
A new evaluation of the pion weak form factors
A new evaluation of the pion weak form factors // Fizika B : a journal of experimental and theoretical physics : general physics, nuclear physics, particles and fields, astrophysics, 13 (2004), 1; 127-134 (podatak o recenziji nije dostupan, članak, znanstveni)
CROSBI ID: 192067 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
A new evaluation of the pion weak form factors
Autori
Počanić, Dinko ; Frlež, Emil ; Baranov, V.A. ; Bertl, W. ; Bronnimann, Ch. ; Bychkov, M.: Crawford, J.F. ; Daum, M. ; Khomutov, N.V. ; Korenchenko, A.S. ; Korenchenko, S.M. ; Kozlowski, T. ; Kravchuk, N.P. ; Kuchinsky, N.A. ; Li, W. ; Minehart, R.C. ; Mzhavia, D. ; Ritchie, B.G. ; Ritt, S. ; Rozhdestvensky, A.M. ; Sidorkin, V.V. ; Smith, L.C. ; Supek, Ivan ; Tsamalaidze, Z. ; VanDevender, B.A. ; Wang, Y. ; Wirtz, H.-P. ; Ziock, K.O.H.
Izvornik
Fizika B : a journal of experimental and theoretical physics : general physics, nuclear physics, particles and fields, astrophysics (1330-0016) 13
(2004), 1;
127-134
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
pion weak form factor; rare decays; radiative decay
Sažetak
We have used the PIBETA large-acceptance detector for a precise measurement of the pi+->e+nigama radiative decay at rest, with a broad phase space coverage. Using the CVC value for the pion vector form factor, F_V=0.0259(5), we have obtained a new value of the pion axial-vector form factor gamma=F_A/F_V=0.429(14). However, significant deviations from the SM predictions are evident in our data. The discrepancy can be accounted for by introducing a pion tensor form factor of F_T=-0.0016(3). The question of the true nature of the observed deviations remains open pending further theoretical and experimental study.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
