Testing the light scalar meson as a non-$$ q\overline{q} $$ state in semileptonic D decays

• DOI: 10.1007/jhep12(2024)226
• Publication Date: 2025-01-28T03:09:13Z
• Authors: Yu-Kuo Hsiao; Shu-Qi Yang; Wen-Juan Wei; Bai-Cian Ke
• Keywords: Overline; B meson; Scalar meson; Semileptonic decay

A bstract While the light scalar mesons ( S 0 ) are considered to be either ordinary $$ q\overline{q} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>q</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> or exotic tetraquark states, we investigate semileptonic decays D → e + ν , by taking into account resonant effects of M 1 2 where = a (980), f and (500)/ σ 1(2) represents pseudoscalar meson. For first time, form factors in two quark structures both presented. Subsequently, calculate \mathcal{B} <mml:mi>B</mml:mi> {D}_s^{+} <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> π − (20.3 ± 1.8 0.5) × 10 4 structure, showing significant 9 deviations from experimental upper limit 3.3 . In contrast, {0.58}_{-0.57}^{+1.43} <mml:mn>0.58</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.57</mml:mn> </mml:mrow> <mml:mn>1.43</mml:mn> 0.01) {q}^2{\overline{q}}^2 <mml:msup> <mml:mn>2</mml:mn> </mml:msup> structure is within allowed range. Clearly, meson tested as non- state. We hence demonstrate highly sensitive new approach for exploring true nature mesons, which can extended non-leptonic well B decays.