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Collins asymmetries in inclusive charged $KK$ and $K\pi$ pairs produced in $e^+e^-$ annihilation

Abstract : We present measurements of Collins asymmetries in the inclusive process $e^+e^- \rightarrow h_1 h_2 X$, $h_1h_2=KK,\, K\pi,\, \pi\pi$, at the center-of-mass energy of 10.6 GeV, using a data sample of 468 fb$^{-1}$ collected by the BaBar experiment at the PEP-II $B$ factory at SLAC National Accelerator Center. Considering hadrons in opposite thrust hemispheres of hadronic events, we observe clear azimuthal asymmetries in the ratio of unlike- to like-sign, and unlike- to all charged $h_1 h_2$ pairs, which increase with hadron energies. The $K\pi$ asymmetries are similar to those measured for the $\pi\pi$ pairs, whereas those measured for high-energy $KK$ pairs are, in general, larger.
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Contributor : Claudine Bombar <>
Submitted on : Monday, June 22, 2015 - 2:59:16 PM
Last modification on : Saturday, November 28, 2020 - 12:58:04 PM

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J.-P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Collins asymmetries in inclusive charged $KK$ and $K\pi$ pairs produced in $e^+e^-$ annihilation. Physical Review D, American Physical Society, 2015, 92, pp.111101. ⟨10.1103/PhysRevD.92.111101⟩. ⟨in2p3-01166293⟩



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