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arxiv: 1906.08998 · v1 · pith:WBU7UBQMnew · submitted 2019-06-21 · ✦ hep-ex

Charmonium and Charm Spectroscopy

Y. Hu This is my paper

Pith reviewed 2026-05-25 18:37 UTC · model grok-4.3

classification ✦ hep-ex
keywords charmoniumcharm spectroscopyBESIIIBelleLHCbCMSbaryonsresonances
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The pith

Recent data from BESIII, Belle, LHCb and CMS enable resonant parameter measurements of several charmonium states and observations of new excited charm baryons.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This review compiles recent experimental results on charmonium and charm spectroscopy drawn from data collected at the BESIII, Belle, LHCb and CMS experiments. It concentrates on updated resonant parameters for chi_cJ, eta_c and eta_c(2S) states together with candidate observations of psi(1^3D_3), an alternative chi_c0(2P), excited B_c states, Xi(2930) states, excited Omega_c states, a doubly charm baryon and Lambda_c* states. A sympathetic reader would care because these measurements refine the known spectrum of particles containing charm quarks and test how the strong force binds heavy quarks into hadrons.

Core claim

Recent data samples from BESIII, Belle, LHCb and CMS have enabled resonant parameter measurements of chi_cJ, eta_c, eta_c(2S) and observations of psi(1^3D_3) candidate, alternative chi_c0(2P) candidate, excited B_c states, Xi(2930) states, excited Omega_c states, doubly charm baryon, and Lambda_c* states.

What carries the argument

The resonant parameter measurements and quantum number assignments extracted from the experimental data samples of the four listed experiments.

Load-bearing premise

The resonance interpretations and quantum number assignments reported by the individual experiments are correct and the data samples are free of significant unaccounted systematic effects.

What would settle it

A new analysis of any of the cited data sets that assigns different J^PC quantum numbers to one of the reported states or finds large previously unaccounted systematics would undermine the interpretations summarized in the review.

Figures

Figures reproduced from arXiv: 1906.08998 by Y. Hu.

Figure 1
Figure 1. Figure 1: FIG. 1: Mass distribution for selected [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: The masses of χc0, χc1, χc2, ηc(1S) and ηc(2S) are measured as 3413.0 ± 1.9 ± 0.6 MeV/c2 , 3508.4 ± 1.9 ± 0.7 MeV/c2 , 3557.3 ± 1.7 ± 0.7 MeV/c2 , 2982.8 ± 1.0 ± 0.5 MeV/c2 and 3636.4 ± 4.1 ± 0.7 MeV/c2 , respectively. The natural width of the ηc(1S) is mea￾sured as 31.4 ± 3.5 ± 2.0 MeV. The measurements of the ηc(1S) mass and natural width using ηc(1S) meson decays to φφ are consistent with the studies us… view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Mass spectra of (top) [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6: Results of the fit of the Λ [PITH_FULL_IMAGE:figures/full_fig_p004_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7: Invariant mass distribution of Λ [PITH_FULL_IMAGE:figures/full_fig_p005_7.png] view at source ↗
read the original abstract

In this talk, we review the recent experimental developments on charmonium and charm spectroscopy base on the data samples taken by the BESIII, Belle, LHCb and CMS experiments. We concentrate on the resonant parameter measurement of $\chi_{cJ}$, $\eta_{c}$, $\eta_{c}(2S)$, observation of $\psi(1^{3}D_{3})$ candidate and alternative $\chi_{c0}(2P)$ candidate, observation of excited $B_{c}$ states, $\Xi(2930)$ states, excited $\Omega_{c}$ states and doubly charm baryon, and the study of $\Lambda_{c}^{*}$ states.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. This manuscript is a review talk summarizing recent experimental results on charmonium and charm spectroscopy from the BESIII, Belle, LHCb, and CMS collaborations. It focuses on resonant parameter measurements for χ_cJ, η_c, and η_c(2S), along with observations of a ψ(1³D₃) candidate, an alternative χ_c0(2P) candidate, excited B_c states, Ξ(2930) states, excited Ω_c states, a doubly charm baryon, and studies of Λ_c* states, all based on published data samples without new analyses or fits performed in the paper itself.

Significance. If the reporting is accurate, the review provides a consolidated overview of recent progress in heavy-quark spectroscopy, which is useful for the community as it collects results from multiple experiments on QCD bound states in the charm sector. No machine-checked proofs, reproducible code, or parameter-free derivations are present, as expected for an experimental summary talk.

minor comments (2)
  1. Abstract: 'base on the data samples' should be corrected to 'based on the data samples' for grammatical accuracy.
  2. The manuscript would benefit from explicit cross-references to the original publications for each listed measurement or observation to aid readers in locating the primary sources.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the careful reading of the manuscript and the positive recommendation to accept.

Circularity Check

0 steps flagged

No significant circularity; review of external experimental results

full rationale

This is a review talk that summarizes published resonant-parameter measurements and candidate observations from BESIII, Belle, LHCb and CMS. The text lists external findings on chi_cJ, eta_c, psi(1^3D_3), B_c states, Omega_c states and Lambda_c* without performing new fits, amplitude analyses, or model derivations inside the paper. No equations, ansatze, or self-citations are used to derive any quantity; the content reduces to accurate reporting of independent experimental results. No load-bearing step reduces to a fitted input or self-citation chain.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No free parameters, axioms, or invented entities are introduced because the work is an experimental review without theoretical derivations or new postulates.

pith-pipeline@v0.9.0 · 5619 in / 1054 out tokens · 20878 ms · 2026-05-25T18:37:18.483080+00:00 · methodology

discussion (0)

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