Amplitude analysis of B0 s → K0 SK±π∓ decays

Abstract

A bstract The first untagged decay-time-integrated amplitude analysis of B s 0 → K S 0 K ± π ∓ decays is performed using a sample corresponding to 3.0 fb −1 of pp collision data recorded with the LHCb detector during 2011 and 2012. The data are described with an amplitude model that contains contributions from the intermediate resonances K * (892) 0,+ , K 2 * (1430) 0,+ and K 0 * (1430) 0,+ , and their charge conjugates. Measurements of the branching fractions of the decay modes B s 0 → K * (892) ± K ∓ and $$ {B}_s^0\to \overset{\left(\hbox{---} \right)}{K^{*}}{(892)}^0\overset{\left(\hbox{---} \right)}{K^0} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:mover> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>*</mml:mo> </mml:msup> <mml:mfenced> <mml:mo>—</mml:mo> </mml:mfenced> </mml:mover> <mml:msup> <mml:mfenced> <mml:mn>892</mml:mn> </mml:mfenced> <mml:mn>0</mml:mn> </mml:msup> <mml:mover> <mml:msup> <mml:mi>K</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mfenced> <mml:mo>—</mml:mo> </mml:mfenced> </mml:mover> </mml:math> are in agreement with, and more precise than, previous results. The decays B s 0 → K 0 * (1430) ± K ∓ and $$ {B}_s^0\to \overset{\left(\hbox{---} \right)}{K_0^{*}}{(1430)}^0\overset{\left(\hbox{---} \right)}{K^0} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:mover> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mn>0</mml:mn> <mml:mo>*</mml:mo> </mml:msubsup> <mml:mfenced> <mml:mo>—</mml:mo> </mml:mfenced> </mml:mover> <mml:msup> <mml:mfenced> <mml:mn>1430</mml:mn> </mml:mfenced> <mml:mn>0</mml:mn> </mml:msup> <mml:mover> <mml:msup> <mml:mi>K</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mfenced> <mml:mo>—</mml:mo> </mml:mfenced> </mml:mover> </mml:math> are observed for the first time, each with significance over 10 standard deviations.