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• W4384297995 abstract "First hidden-charm pentaquark candidate with strangeness, $P_{psi s}^Lambda(4338)$, was recently discovered in $B^-to J/psiLambdabar{p}$ by the LHCb Collaboration. $P_{psi s}^Lambda(4338)$ shows up as a bump at the $Xi_cbar{D}$ threshold in the $J/psiLambda$ invariant mass ($M_{J/psiLambda}$) distribution. The $M_{J/psiLambda}$ distribution also shows a large fluctuation at the $Lambda_cbar{D}_s$ threshold, hinting the existence of a possible $P_{psi s}^Lambda(4255)$. In this work, we determine the $P_{psi s}^Lambda(4338)$ and $P_{psi s}^Lambda(4255)$ pole positions for the first time. For this purpose, we fit a $B^-to J/psiLambdabar{p}$ model to the $M_{J/psiLambda}$, $M_{J/psibar{p}}$, $M_{Lambdabar{p}}$, and $costheta_{K^*}$ distributions from the LHCb simultaneously; $chi^2/{rm ndf}sim 1.21$. Then we extract $P_{psi s}^Lambda$ poles from a unitary $Xi_cbar{D}$-$Lambda_cbar{D}_s$ coupled-channel scattering amplitude built in the model. In our default fit, the $P_{psi s}^Lambda(4338)$ pole is found at $( 4338.2pm 1.4)-( 1.9pm 0.5 ),i$ MeV while the $P_{psi s}^Lambda(4255)$ pole at $4254.7pm 0.4$ MeV. The $P_{psi s}^Lambda(4338)$ and $P_{psi s}^Lambda(4255)$ are mostly $Xi_c bar{D}$ bound and $Lambda_cbar{D}_s$ virtual states, respectively. Through our analysis, the data disfavors a hypothesis of $P_{psi s}^Lambda(4338)$ as merely a kinematical effect. This pole determination, which is important in its own right, sets a primary basis to study the nature of the $P_{psi s}^Lambda$ states." @default.
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• W4384297995 date "2023-07-14" @default.
• W4384297995 modified "2023-10-18" @default.
• W4384297995 title "Pole determination of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msubsup><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mi>ψ</mml:mi><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>Λ</mml:mi></mml:mrow></mml:msubsup><mml:mo stretchy=false>(</mml:mo><mml:mn>4338</mml:mn><mml:mo stretchy=false>)</mml:mo></mml:mrow></mml:math> and possible <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow…" @default.
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• W4384297995 doi "https://doi.org/10.1103/physrevd.108.l011501" @default.
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