743 research outputs found
B-s-< over bar > B < over bar >(s) mixing constraints on FCNC and a nonuniversal Z(’)
No full text
K+ -> pi(+) nu(nu)over-bar and FCNC from nonuniversal Z(') bosons
No full textMotivated by the E787 and E949 result for K+-->pi(+)nu(nu) over bar we examine the effects of a new nonuniversal right-handed Z(') boson on flavor changing processes. We place bounds on the tree-level flavor-changing neutral current from K-(K) over bar and B-(B) over bar mixing as well as from the observed CP violation in kaon decay. We discuss the implications for K-->pinu(nu) over bar, B-->Xnu(nu) over bar and B-->tau(+)tau(-). We find that the existing bounds allow substantial enhancements in the K+-->pi(+)nu<(nu())over bar> rate, particularly through a new one-loop Z(') penguin operator.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000224275200008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)28ARTICLE5null7
Parity, charge conjugation, and SU(3) constraints on threshold enhancement in J/psi decays into gamma p(p)over-bar and Kp(Lambda)over-bar
No full textWe study the threshold enhancement effects of baryon-antibaryon systems in J/psi decays at BES using parity P, charge conjugation C, and flavor SU(3) symmetries. The P and C symmetries restrict the p (p) over bar in J/psi-->gammap (p) over bar to be in a state with C=+1, while the p (p) over bar in J/psi-->pi(0)p (p) over bar to be with C=-1. Combining the C and P symmetries with flavor SU(3) symmetry, i.e., the CPS symmetry, we find that the Lambda(p) over bar system cannot be in 0(+) and 0(-) states in J/psi-->K(+)Lambda(p) over bar. We provide a consistent explanation of observation and nonobservation of near threshold enhancements in J/psi-->K(+)Lambda(p) over bar and J/psi-->pi(0)p (p) over bar, respectively. We also find that near baryon pair threshold enhancement can happen in several channels for J/psi decays and can be several times larger than that observed in J/psi-->K(+)Lambda(p) over bar in some channels.Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)0ARTICLE1null7
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