%0 Journal Article
%T Observation of the B-0 -> rho(0)rho(0) decay from an amplitude analysis of B-0 -> (pi(+)pi(-))(pi(+)pi(-)) decays
%A LHCb Collaboration (Aaij, R. et al
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Ruiz Valls, P.
%A Sanchez Mayordomo, C.
%J Physics Letters B
%D 2015
%V 747
%I Elsevier Science Bv
%@ 0370-2693
%G English
%F LHCbCollaborationAaij_etal2015
%O WOS:000358624800076
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2332), last updated on Tue, 08 Sep 2015 13:10:36 +0000
%X Proton-proton collision data recorded in 2011 and 2012 by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb(-1), are analysed to search for the charmless B-0 -> rho(0)rho(0) decay. More than 600 B-0 -> (pi(+)pi(-))(pi(+)pi(-)) signal decays are selected and used to perform an amplitude, analysis, under the assumption of no CP violation in the decay, from which the B-0 -> rho(0)rho(0) decay is observed for the first time with 7.1 standard deviations significance. The fraction of B-0 -> rho(0)rho(0) decays yielding a longitudinally polarised final state is measured to be f(L) = 0.745(-0.058)(+0.048)(stat) +/- 0.034(syst). The B-0 -> rho(0)rho(0) branching fraction, using the B-0 -> phi K*(892)(0) decay as reference, is also reported as B(B-0 -> rho(0)rho(0)) = (0.94 +/- 0.17(stat) +/- 0.09(syst) +/- 0.06(BF)) x 10(-6).
%R 10.1016/j.physletb.2015.06.027
%U http://arxiv.org/abs/1503.07770
%U https://doi.org/10.1016/j.physletb.2015.06.027
%P 468-478