Measurement of transverse single-spin asymmetries for dijet production in polarized proton-proton collisions at $\mathbf{\sqrt{s}}$ = 200 $\mathbf{\mathrm{GeV}}$
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866914255717007360 |
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| author | STAR Collaboration |
| author_facet | STAR Collaboration |
| contents | We report a new measurement of transverse single-spin asymmetries for dijet production in collisions of polarized protons at $\sqrt{s}$ = 200 \mathrm{GeV}$. Correlations between the proton spin and the transverse momenta of its partons, each perpendicular to the proton momentum direction, are probed at high $Q^2$ $\approx $160 $\mathrm{GeV}^2$. Evidence for nonzero Sivers effects is measured for the first time in dijets from proton-proton collisions, but only when the jets are sorted by their net charge, which enhances the otherwise canceling opposite-sign $u$- or $d$-quark contributions to separate data samples. The resulting asymmetries are compared to recent theoretical calculations. Separately, the associated Sivers observable $\kt$, the average parton transverse momentum, is extracted using a simple kinematics approach which further enables a determination of the individual partonic contributions to the observed asymmetries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_10359 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Measurement of transverse single-spin asymmetries for dijet production in polarized proton-proton collisions at $\mathbf{\sqrt{s}}$ = 200 $\mathbf{\mathrm{GeV}}$ STAR Collaboration High Energy Physics - Experiment Nuclear Experiment We report a new measurement of transverse single-spin asymmetries for dijet production in collisions of polarized protons at $\sqrt{s}$ = 200 \mathrm{GeV}$. Correlations between the proton spin and the transverse momenta of its partons, each perpendicular to the proton momentum direction, are probed at high $Q^2$ $\approx $160 $\mathrm{GeV}^2$. Evidence for nonzero Sivers effects is measured for the first time in dijets from proton-proton collisions, but only when the jets are sorted by their net charge, which enhances the otherwise canceling opposite-sign $u$- or $d$-quark contributions to separate data samples. The resulting asymmetries are compared to recent theoretical calculations. Separately, the associated Sivers observable $\kt$, the average parton transverse momentum, is extracted using a simple kinematics approach which further enables a determination of the individual partonic contributions to the observed asymmetries. |
| title | Measurement of transverse single-spin asymmetries for dijet production in polarized proton-proton collisions at $\mathbf{\sqrt{s}}$ = 200 $\mathbf{\mathrm{GeV}}$ |
| topic | High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2305.10359 |