Study of the $e^+e^-\to K^+K^-$ reaction in the energy range from 2.6 to 8.0 GeV - INSPIRE

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Study of the $e^+e^-\to K^+K^-$ reaction in the energy range from 2.6 to 8.0 GeV

BaBar

Collaboration

Jul 16, 2015

16 pages

Published in:

Phys.Rev.D 92 (2015) 7, 072008

Published: Oct 20, 2015

e-Print:

1507.04638 [hep-ex]

DOI:

10.1103/PhysRevD.92.072008

PDG:

{{\mathit J / \psi}{(1S)}}

\rightarrow

{{\mathit e}^{+}}{{\mathit e}^{-}}

Report number:

BABAR-PUB-15-004,
SLAC-PUB-16333

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract: (APS)

The e+e-→K+K- cross section and charged-kaon electromagnetic form factor are measured in the e+e- center-of-mass energy range (E) from 2.6 to 8.0 GeV using the initial-state radiation technique with an undetected photon. The study is performed using 469 fb-1 of data collected with the BABAR detector at the PEP-II2 e+e- collider at center-of-mass energies near 10.6 GeV. The form factor is found to decrease with energy faster than 1/E2 and approaches the asymptotic QCD prediction. Production of the K+K- final state through the J/ψ and ψ(2S) intermediate states is observed. The results for the kaon form factor are used together with data from other experiments to perform a model-independent determination of the relative phases between electromagnetic (single-photon) and strong amplitudes in J/ψ and ψ(2S)→K+K- decays. The values of the branching fractions measured in the reaction e+e-→K+K- are shifted relative to their true values due to interference between resonant and nonresonant amplitudes. The values of these shifts are determined to be about ±5% for the J/ψ meson and ±15% for the ψ(2S) meson.

Note:

18 pages, 19 postscript figures

13.66.Bc
13.25.Gv
13.40.Gp
14.40.Df
electron positron: annihilation
K: pair production
K: form factor
form factor: electromagnetic
branching ratio: measured
psi(3685): intermediate state

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