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Measurement of D_s^(pm) production asymmetry in pp collisions at sqrt{s} =7 and 8 TeV
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arxiv 1805.09869 v2 pith:2GR3PNGX submitted 2018-05-24 hep-ex
Measurement of D_s^(pm) production asymmetry in pp collisions at sqrt{s} =7 and 8 TeV
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The inclusive $D_s^{\pm}$ production asymmetry is measured in $pp$ collisions collected by the LHCb experiment at centre-of-mass energies of $\sqrt{s} =7$ and 8 TeV. Promptly produced $D_s^{\pm}$ mesons are used, which decay as $D_s^{\pm}\to\phi\pi^{\pm}$, with $\phi\to K^+K^-$. The measurement is performed in bins of transverse momentum, $p_{\rm T}$, and rapidity, $y$, covering the range $2.5<p_{\rm T}<25.0$ GeV$/c$ and $2.0<y<4.5$. No kinematic dependence is observed. Evidence of nonzero $D_s^{\pm}$ production asymmetry is found with a significance of 3.3 standard deviations.
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