Comment on "Exploring Data-Driven Corrections for $ϕ$-Meson Global Spin Alignment Measurements" (arXiv:2508.18409)
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| Format: | Preprint |
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2025
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| _version_ | 1866911132079357952 |
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| author | Chen, Jinhui Shen, Diyu Sun, Xu Tang, Aihong Xi, Baoshan |
| author_facet | Chen, Jinhui Shen, Diyu Sun, Xu Tang, Aihong Xi, Baoshan |
| contents | The method in arXiv:2508.18409 constructs a ``data-driven correction'' from combinatorial (pseudo-$ϕ$) pairs and applies it to the signal. An explicit decomposition shows that the construction calibrates the background response rather than the signal: it is defined by the difference between an acceptance-free pseudo-$ϕ$ surrogate and its data-level realization. Promoting a background-derived correction to a signal correction requires a strong physics proof that signal and background share identical detector response at the pair level -- including acceptance-anisotropy couplings and dependencies on parent kinematics -- which the manuscript does not establish. Consequently, local numerical proximity in a restricted region of phase space is incidental rather than evidentiary; validation must rest on mechanism, not numerical coincidence. Moreover, the pseudo-$ϕ$ background is non-unique: with infinitely many admissible constructions, any apparent agreement for a few cases would not be dispositive -- no finite scan can substitute for a mechanism-level response equivalence. In the absence of such a demonstrated equivalence, the construction should be regarded as a background calibration rather than a signal correction. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_01112 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Comment on "Exploring Data-Driven Corrections for $ϕ$-Meson Global Spin Alignment Measurements" (arXiv:2508.18409) Chen, Jinhui Shen, Diyu Sun, Xu Tang, Aihong Xi, Baoshan Nuclear Experiment High Energy Physics - Phenomenology The method in arXiv:2508.18409 constructs a ``data-driven correction'' from combinatorial (pseudo-$ϕ$) pairs and applies it to the signal. An explicit decomposition shows that the construction calibrates the background response rather than the signal: it is defined by the difference between an acceptance-free pseudo-$ϕ$ surrogate and its data-level realization. Promoting a background-derived correction to a signal correction requires a strong physics proof that signal and background share identical detector response at the pair level -- including acceptance-anisotropy couplings and dependencies on parent kinematics -- which the manuscript does not establish. Consequently, local numerical proximity in a restricted region of phase space is incidental rather than evidentiary; validation must rest on mechanism, not numerical coincidence. Moreover, the pseudo-$ϕ$ background is non-unique: with infinitely many admissible constructions, any apparent agreement for a few cases would not be dispositive -- no finite scan can substitute for a mechanism-level response equivalence. In the absence of such a demonstrated equivalence, the construction should be regarded as a background calibration rather than a signal correction. |
| title | Comment on "Exploring Data-Driven Corrections for $ϕ$-Meson Global Spin Alignment Measurements" (arXiv:2508.18409) |
| topic | Nuclear Experiment High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.01112 |