Observation of the $B^0 \to \rho^0 \rho^0$ decay from an amplitude analysis of $B^0 \to (\pi^+\pi^-)(\pi^+\pi^-)$ decays - INSPIRE

DataBETA

Observation of the $B^0 \to \rho^0 \rho^0$ decay from an amplitude analysis of $B^0 \to (\pi^+\pi^-)(\pi^+\pi^-)$ decays

LHCb

Collaboration

Mar 26, 2015

11 pages

Published in:

Phys.Lett.B 747 (2015) 468-478

Published: Jul 30, 2015

e-Print:

1503.07770 [hep-ex]

DOI:

10.1016/j.physletb.2015.06.027

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit K}^{*}{(892)}^{0}}{{\mathit \phi}}

Report number:

LHCB-PAPER-2015-006,
CERN-PH-EP-2015-077

Experiments:

CERN-LHC-LHCb

View in:

reference search45 citations

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Abstract: (Elsevier)

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 B0→ρ0ρ0 decay. More than 600 B0→(π+π−)(π+π−) signal decays are selected and used to perform an amplitude analysis, under the assumption of no CP violation in the decay, from which the B0→ρ0ρ0 decay is observed for the first time with 7.1 standard deviations significance. The fraction of B0→ρ0ρ0 decays yielding a longitudinally polarised final state is measured to be fL=0.745−0.058+0.048(stat)±0.034(syst) . The B0→ρ0ρ0 branching fraction, using the B0→ϕK⁎(892)0 decay as reference, is also reported as B(B0→ρ0ρ0)=(0.94±0.17(stat)±0.09(syst)±0.06(BF))×10−6 .

Note:

as published in PLB

experimental results
B0: decay modes
amplitude analysis
statistical analysis
helicity
branching ratio
LHC-B
B0 --> pi+ pi- pi+ pi-
B0 --> rho(1450)0 rho(1450)0
7000 GeV-cms

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