dorsal/arxiv
View SchemaDecoding the Amplitude Pair with Distinct CPV Phases in Charmed Baryon Decays
| Authors | Zhi-Peng Xing, Jin Sun, Xiao-Gang He |
|---|---|
| Categories | |
| ArXiv ID | 2601.08502vv2 |
| URL | https://arxiv.org/abs/2601.08502 |
| License | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
Abstract
In this Letter, we propose a strategy to extract information on the hierarchical amplitude pair in singly Cabibbo-suppressed (SCS) charmed baryon two-body decays, with a dominant amplitude proportional to $\lambda_s = V_{cs}^* V_{us}$ from tree operators and sub-leading one proportional to $\lambda_b = V_{cb}^* V_{ub}$ from both penguin and tree contributions. The coexistence of these two amplitudes is essential for generating nonzero CP violation (CPV) effects. Since the $\lambda_b$ amplitude is strongly suppressed, its experimental determination is highly challenging. However, by exploiting SU(3) flavor symmetry, which relates the well-measured Cabibbo-favored (CF) amplitudes to the SCS tree amplitudes, information on the $\lambda_b$ amplitude can be extracted. Using current experimental data, a conservative analysis yields $\lambda_b$ amplitudes can be as large as about $10\%$ of the corresponding tree amplitudes with a significance of $2.1\sigma$. In addition, the Lee-Yang parameters of these decays provide an independent probe of this elusive term. We further identify two golden decay channels, $\Xi_c^0 \to p K^-$ and $\Xi_c^0 \to \Sigma^+ \pi^-$, which are particularly well suited for experimental studies of CPV.
{
"annotation_id": "1018d0fb-c4fa-413f-9837-9ed7eec066fd",
"date_created": "2026-02-17T05:53:15.227000Z",
"date_modified": "2026-02-17T05:53:15.227000Z",
"file_hash": "a44b5d981bb1fa81be18789449f25850baacfe9da6055ab8338639c5dbab831b",
"private": false,
"record": {
"abstract": "In this Letter, we propose a strategy to extract information on the hierarchical amplitude pair in singly Cabibbo-suppressed (SCS) charmed baryon two-body decays, with a dominant amplitude proportional to $\\lambda_s = V_{cs}^* V_{us}$ from tree operators and sub-leading one proportional to $\\lambda_b = V_{cb}^* V_{ub}$ from both penguin and tree contributions. The coexistence of these two amplitudes is essential for generating nonzero CP violation (CPV) effects. Since the $\\lambda_b$ amplitude is strongly suppressed, its experimental determination is highly challenging. However, by exploiting SU(3) flavor symmetry, which relates the well-measured Cabibbo-favored (CF) amplitudes to the SCS tree amplitudes, information on the $\\lambda_b$ amplitude can be extracted. Using current experimental data, a conservative analysis yields $\\lambda_b$ amplitudes can be as large as about $10\\%$ of the corresponding tree amplitudes with a significance of $2.1\\sigma$. In addition, the Lee-Yang parameters of these decays provide an independent probe of this elusive term. We further identify two golden decay channels, $\\Xi_c^0 \\to p K^-$ and $\\Xi_c^0 \\to \\Sigma^+ \\pi^-$, which are particularly well suited for experimental studies of CPV.",
"arxiv_id": "2601.08502",
"authors": [
"Zhi-Peng Xing",
"Jin Sun",
"Xiao-Gang He"
],
"categories": [
"hep-ph",
"hep-ex"
],
"license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
"title": "Decoding the Amplitude Pair with Distinct CPV Phases in Charmed Baryon Decays",
"url": "https://arxiv.org/abs/2601.08502",
"version": "v2"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "bc259a48-3194-42ce-b230-72e6daeb60f0",
"id": "arXiv Dataset",
"type": "Model",
"variant": "snapshot-2026-01-17",
"version": "0.1.0"
},
"user_id": 1000002
}