Search for X(3872) → π+ π- π0 at Belle

We present a search for the decay X(3872)-> pi(+)pi(-) pi(0) in the (772 +/- 11 ) 10(6) gamma (4S) -> B (B) over bar bar data sample collected at the Belle detector, where the X(3872) thorn is produced in B +/- -> (KX)-X-+/-(3872) and B-0 -> (KSX)-X-0(3872) decays. We do not observe a signal, and set 90% credible upper limits for two different models of the decay processes: if the decay products are distributed uniformly in phase space, B(X(3872) -> pi(+)pi(-)pi(0) ) < 1.3%, and if M(pi(+) pi(-) ) is concentrated near the mass of the D-0 <(D)over bar>(0) pair in the process X(3872) -> D-0 over bar (D) over bar (0) thorn c:c: -> D-0 (D) over bar (0)pi(0) -> pi(+)pi(-) pi(0), B(X(3872) -> pi(+) pi(-) pi(0) ) < 1.2 x 10(-3).

Automated summary

In this study, a search for the decay X(3872)-> pi(+)pi(-) pi(0) was performed using the Belle detector on a data sample of (772 +/- 11 ) 10(6) gamma (4S) -> B (B) over bar bar. No signal was observed and 90% credible upper limits were set for two different models of the decay processes.