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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.22898 |
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| _version_ | 1866910006101671936 |
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| author | Park, In Woo Kim, Beomkyu Torrieri, Giorgio Gonçalves, Kayman J. Lim, Sanghoon Lee, Su Houng |
| author_facet | Park, In Woo Kim, Beomkyu Torrieri, Giorgio Gonçalves, Kayman J. Lim, Sanghoon Lee, Su Houng |
| contents | The correlation between vorticity and spin alignment in heavy-ion collisions can be probed through polarization measurements of hadrons, whose total spin originates from both constituent-quark spins and orbital angular momentum in the quark-model framework. To motivate such experimental studies, we calculate the general angular distribution of produced pion in $f_2(1270)\toπ+π$ using interaction Lagrangian and helicity formalism and check that both methods yield the same result. The distribution is given as a function of angle between pion and initial quantization axis of $f_2$ and the spin density matrix element of $f_2$. Its diagonal entries and $ρ_{20}$ component were computed assuming local thermal equilibrium and blast wave model for different centrality classes, hence given as a function of azimuthal angle with respect to the impact parameter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_22898 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | $f_2(1270)\toπ+π$ as a probe of spin and vorticity in heavy-ion collisions Park, In Woo Kim, Beomkyu Torrieri, Giorgio Gonçalves, Kayman J. Lim, Sanghoon Lee, Su Houng Nuclear Theory Nuclear Experiment The correlation between vorticity and spin alignment in heavy-ion collisions can be probed through polarization measurements of hadrons, whose total spin originates from both constituent-quark spins and orbital angular momentum in the quark-model framework. To motivate such experimental studies, we calculate the general angular distribution of produced pion in $f_2(1270)\toπ+π$ using interaction Lagrangian and helicity formalism and check that both methods yield the same result. The distribution is given as a function of angle between pion and initial quantization axis of $f_2$ and the spin density matrix element of $f_2$. Its diagonal entries and $ρ_{20}$ component were computed assuming local thermal equilibrium and blast wave model for different centrality classes, hence given as a function of azimuthal angle with respect to the impact parameter. |
| title | $f_2(1270)\toπ+π$ as a probe of spin and vorticity in heavy-ion collisions |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2601.22898 |