Academic Journal
Acceptance Effects on the Extracted Spin Alignment of K * 0 Mesons in Relativistic Heavy-Ion Collisions.
| Τίτλος: | Acceptance Effects on the Extracted Spin Alignment of K * 0 Mesons in Relativistic Heavy-Ion Collisions. |
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| Συγγραφείς: | Lan, Shaowei1 (AUTHOR) shaoweilan@pdsu.edu.cn, Liu, Qiuhua1 (AUTHOR), Ji, Pengfei1 (AUTHOR) |
| Πηγή: | Universe (2218-1997). May2026, Vol. 12 Issue 5, p145. 12p. |
| Θεματικοί όροι: | *Vector mesons, *Heavy ion collisions, *Mesons, *Density matrices |
| Περίληψη: | The spin alignment of vector mesons, characterized by the spin-density-matrix element ρ 00 , is an important observable for studying spin dynamics in relativistic heavy-ion collisions. Experimental measurements have reported deviations of ρ 00 from the isotropic expectation of 1 / 3 , motivating careful evaluation of possible acceptance effects. In this work, we investigate the influence of finite experimental coverage on the extracted ρ 00 of K ∗ 0 mesons using a toy model constrained by realistic kinematic distributions from the AMPT model. The reconstructed ρ 00 is examined as a function of pseudorapidity (η) and transverse momentum ( p T ) within typical experimental acceptance ranges. We find that limited pseudorapidity coverage can lead to reconstructed ρ 00 values above 1 / 3 , even when the input distribution is isotropic. This behavior originates from the selective removal of decay daughters outside the η window, which modifies the cos θ ∗ distribution. A dependence on transverse momentum is also observed, particularly at low p T where daughter particles are more sensitive to longitudinal acceptance constraints. Comparisons with STAR measurements are presented for reference, without attempting to reinterpret the experimental results. Overall, this study provides a systematic examination of acceptance-induced effects and may serve as a useful reference for future measurements of vector-meson spin alignment. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: | Academic Search Index |
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