Search for an Axionlike Particle in $B$ Meson Decays

Axionlike particles (ALPs) are predicted in many extensions of the standard model, and their masses can naturally be well below the electroweak scale. In the presence of couplings to electroweak bosons, these particles could be emitted in flavor-changing

B

meson decays. We report herein a search for an ALP,

a

, in the reaction

B^{\pm} \to K^{\pm} a

,

a \to γ γ

using data collected by the BABAR experiment at SLAC. No significant signal is observed, and 90% confidence level upper limits on the ALP coupling to electroweak bosons are derived as a function of ALP mass, improving current constraints by several orders of magnitude in the range

0.175 GeV < m_{a} < 4.78 GeV

.

Note:

11 pages, 8 figures, submitted to Phys. Rev. Lett

electron positron: annihilation
electron positron: colliding beams
axion: radiative decay
photon: pair production
B: rare decay
scale: electroweak interaction
current: constraint
axion-like particles
flavor changing
axion: mass

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