Observation of the Semileptonic $D^+$ Decay into the $\bar K_1(1270)^0$ Axial-Vector Meson - INSPIRE

DataBETA

Observation of the Semileptonic $D^+$ Decay into the $\bar K_1(1270)^0$ Axial-Vector Meson

BESIII

Collaboration

Jul 25, 2019

8 pages

Published in:

Phys.Rev.Lett. 123 (2019) 23, 231801

Published: Dec 3, 2019

e-Print:

1907.11370 [hep-ex]

DOI:

10.1103/PhysRevLett.123.231801

PDG:

{{\mathit D}^{+}}

\rightarrow

{{\overline{\mathit K}}_{{{1}}}{(1270)}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{{e}}}}

{{\overline{\mathit K}}_{{{1}}}^{0}}

\rightarrow

{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{0}}

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

reference search37 citations

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Abstract: (APS)

By analyzing a 2.93 fb−1 data sample of e+e- collisions, recorded at a center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we report the first observation of the semileptonic D+ transition into the axial-vector meson D+→K¯1(1270)0e+νe with a statistical significance greater than 10σ. Its decay branching fraction is determined to be B[D+→K¯1(1270)0e+νe]=(2.30±0.26-0.21+0.18±0.25)×10-3, where the first and second uncertainties are statistical and systematic, respectively, and the third originates from the input branching fraction of K¯1(1270)0→K-π+π0.

Elementary Particles and Fields
electron positron: annihilation
electron positron: colliding beams
D+: semileptonic decay
axial-vector meson
K+: branching ratio: measured
K1(1270)
statistical
Beijing Stor
BES

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