TY - JOUR
T1 - V + A currents coupling old quarks to new
AU - Achiman, Y.
AU - Walsh, T. F.
PY - 1977
Y1 - 1977
N2 - We study some consequences of the existence of new quark flavors. We do this in the framework of gauge models, with V + A couplings of old to new quarks and allowing for mixing of different SU(2) × U(1) representations. High-energy neutrino and e+e- experiments may suggest (and can prove) the existence of new flavors. Low-energy neutrino neutral current experiments are sensitive to the way new quarks and their currents are added to the standard Weinberg-Salam model. We show that if new quarks with weak couplings to old u, d quarks are needed at all, low-energy neutral current data may favor a new class of models having non-diagonal neutral currents. However, the special case of a maximal charm-changing neutral current appears to be excluded by high-energy experiments.
AB - We study some consequences of the existence of new quark flavors. We do this in the framework of gauge models, with V + A couplings of old to new quarks and allowing for mixing of different SU(2) × U(1) representations. High-energy neutrino and e+e- experiments may suggest (and can prove) the existence of new flavors. Low-energy neutrino neutral current experiments are sensitive to the way new quarks and their currents are added to the standard Weinberg-Salam model. We show that if new quarks with weak couplings to old u, d quarks are needed at all, low-energy neutral current data may favor a new class of models having non-diagonal neutral currents. However, the special case of a maximal charm-changing neutral current appears to be excluded by high-energy experiments.
UR - http://www.scopus.com/inward/record.url?scp=49449120209&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=49449120209&partnerID=8YFLogxK
U2 - 10.1016/0550-3213(77)90308-X
DO - 10.1016/0550-3213(77)90308-X
M3 - Article
AN - SCOPUS:49449120209
SN - 0550-3213
VL - 118
SP - 237
EP - 252
JO - Nuclear Physics, Section B
JF - Nuclear Physics, Section B
IS - 3-4
ER -