Addressing the lightest S-wave strange K0*(700)/κ resonance in four-body semileptonic B̅s0 → K0π + ℓ -ν ̅ℓ decays
- 1Guizhou Minzu University
Abstract
As the lightest strange scalar resonance, K0*(700) K 0 ∗ ( 700 ) (also called κ κ ) has a large width and resides close to the Kπ K π threshold, leading to a longstanding debate about its internal structure. Within the framework of the conventional quark-antiquark ( qq̅ q q ¯ ) picture, this paper attempts to research the behaviors of K0*(700) K 0 ∗ ( 700 ) resonance in the four-body final state decays. Firstly, we investigate the K0*(700) K 0 ∗ ( 700 ) resonance one twist-2 and two twist-3 light-cone distribution amplitudes (LCDAs), i.e. ϕ 2;K0*(700)(x, μ ) ϕ 2 ; K 0 ∗ ( 700 ) ( x , μ ) and ϕ 3;K0*(700)p;σ (x, μ ) ϕ 3 ; K 0 ∗ ( 700 ) p ; σ ( x , μ ) , by constructing a light-cone harmonic oscillator model. For the longitudinal distribution characteristics of the twist-2 LCDA, two typical parametrization schemes, i.e. φ 2;K0*(700)(S1)(x) φ 2 ; K 0 ∗ ( 700 ) ( S 1 ) ( x ) and φ 2;K0*(700)(S2)(x) φ 2 ; K 0 ∗ ( 700 ) ( S 2 ) ( x ) , are adopted in this paper. Meanwhile, it has enriched theoretical predictions for the first ten-order LCDAs ξ ξ -moments. Subsequently, we apply the QCD light-cone sum rules approach to compute the B̅s0 → K0*(700) B ¯ s 0 → K 0 ∗ ( 700 ) transition form factors (TFFs) f± B̅s0 K0*(700)(q2) f ± B ¯ s 0 K 0 ∗ ( 700 ) ( q 2 ) and fTB̅s0 K0*(700)(q2) f T B ¯ s 0 K 0 ∗ ( 700 ) ( q 2 ) , including the next-to-leading order perturbative 𝒪(α s) O ( α s ) corrections to the twist-2 LCDA contributions. By using the simplified series expansion parameterization, these TFFs are extrapolated over the full physical region. Then, we calculate the differential decay widths and branching fractions for four-body semileptonic decay B̅s0 → K0π + ℓ -ν ̅ℓ B ¯ s 0 → K 0 π + ℓ - ν ¯ ℓ with ℓ = (e, μ , τ ) ℓ = ( e , μ , τ ) via the S -wave K0*(700) K 0 ∗ ( 700 ) resonance in the Kπ K π system, respectively. We expect that the obtained prediction results will provide valuable insights for future experiments and theoretical research.
Versions
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BibTeX
@article{huang2026addressing,
title = {{Addressing the lightest S-wave strange $$K_0^*(700)/\kappa $$ resonance in four-body semileptonic $$\barB_s^0 \rightarrow K^0\pi ^+ \ell ^-\bar\nu _\ell $$ decays}},
author = {Dong Huang and Sheng-Bo Wu and Fang-Ping Peng and Long Zeng and Hai-Bing Fu},
journal = {The European Physical Journal C},
year = {2026},
month = oct,
doi = {10.1140/epjc/s10052-026-16484-4},
url = {https://link.springer.com/article/10.1140/epjc/s10052-026-16484-4},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Addressing the lightest S-wave strange K_0^*(700)/κ resonance in four-body semileptonic B̅_s^0 → K^0π ^+ ℓ ^-ν ̅_ℓ decays
AU - Dong Huang
AU - Sheng-Bo Wu
AU - Fang-Ping Peng
AU - Long Zeng
AU - Hai-Bing Fu
PY - 2026
DA - 2026/10/01
JO - The European Physical Journal C
DO - 10.1140/epjc/s10052-026-16484-4
UR - https://link.springer.com/article/10.1140/epjc/s10052-026-16484-4
AB - As the lightest strange scalar resonance, K_0^*(700) K 0 ∗ ( 700 ) (also called κ κ ) has a large width and resides close to the Kπ K π threshold, leading to a longstanding debate about its internal structure. Within the framework of the conventional quark-antiquark ( qq̅ q q ¯ ) picture, this paper attempts to research the behaviors of K_0^*(700) K 0 ∗ ( 700 ) resonance in the four-body final state decays. Firstly, we investigate the K_0^*(700) K 0 ∗ ( 700 ) resonance one twist-2 and two twist-3 light-cone distribution amplitudes (LCDAs), i.e. ϕ _2;K_0^*(700)(x, μ ) ϕ 2 ; K 0 ∗ ( 700 ) ( x , μ ) and ϕ _3;K_0^*(700)^p;σ (x, μ ) ϕ 3 ; K 0 ∗ ( 700 ) p ; σ ( x , μ ) , by constructing a light-cone harmonic oscillator model. For the longitudinal distribution characteristics of the twist-2 LCDA, two typical parametrization schemes, i.e. φ _2;K_0^*(700)^(S1)(x) φ 2 ; K 0 ∗ ( 700 ) ( S 1 ) ( x ) and φ _2;K_0^*(700)^(S2)(x) φ 2 ; K 0 ∗ ( 700 ) ( S 2 ) ( x ) , are adopted in this paper. Meanwhile, it has enriched theoretical predictions for the first ten-order LCDAs ξ ξ -moments. Subsequently, we apply the QCD light-cone sum rules approach to compute the B̅_s^0 → K_0^*(700) B ¯ s 0 → K 0 ∗ ( 700 ) transition form factors (TFFs) f_± ^B̅_s^0 K_0^*(700)(q^2) f ± B ¯ s 0 K 0 ∗ ( 700 ) ( q 2 ) and f_T^B̅_s^0 K_0^*(700)(q^2) f T B ¯ s 0 K 0 ∗ ( 700 ) ( q 2 ) , including the next-to-leading order perturbative 𝒪(α _s) O ( α s ) corrections to the twist-2 LCDA contributions. By using the simplified series expansion parameterization, these TFFs are extrapolated over the full physical region. Then, we calculate the differential decay widths and branching fractions for four-body semileptonic decay B̅_s^0 → K^0π ^+ ℓ ^-ν ̅_ℓ B ¯ s 0 → K 0 π + ℓ - ν ¯ ℓ with ℓ = (e, μ , τ ) ℓ = ( e , μ , τ ) via the S -wave K_0^*(700) K 0 ∗ ( 700 ) resonance in the Kπ K π system, respectively. We expect that the obtained prediction results will provide valuable insights for future experiments and theoretical research.
SN - 1434-6052
SN - 1434-6044
ER -