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PreprintCC BY-NC-ND 4.0arXiv

Amplitude Analysis of the Invariant-Mass Spectra of Centrally Exclusively Produced π+π- and K+K- Pairs in pp Collisions at √s=510 GeV

  • Aranya Giri
  • Barak Schmookler
  • Rene Bellwied
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Abstract

We present an amplitude analysis of the π+π− and K+K− invariant-mass spectra from central exclusive pp collisions at √s=510 GeV, measured by the STAR experiment with forward-scattered protons tagged in the Roman Pot detectors. The π+π− channel is described with f0(500), ρ0(770), f0(980), f2(1270), f0(1500) and f0(1710) resonances with χ2/ndf=121.712/57. The fit also yields mf0(980)=0.989 GeV and Γ=0.091 GeV. The K+K− channel is described with f0(980), f2(1270), f2′(1525) and f0(1710) resonances with χ2/ndf=14.662/15. The fiducial cross sections for the individual resonances and interference terms were calculated, together with their ratios relative to the total fitted cross section. These ratios were compared across decay channels and qualitatively with previous measurements. A consistent flavor dependence of f0(1500) and f0(1710) has been derived for the highest RHIC collision energies, which is in agreement with low energy data.

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Cite

BibTeXRIS
BibTeX
@misc{giri2026amplitude,
  title = {{Amplitude Analysis of the Invariant-Mass Spectra of Centrally Exclusively Produced $π^+π^-$ and $K^+K^-$ Pairs in $pp$ Collisions at $\sqrts=510$ GeV}},
  author = {Aranya Giri and Barak Schmookler and Rene Bellwied},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.07086},
  eprint = {2611.07086},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.07086},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Amplitude Analysis of the Invariant-Mass Spectra of Centrally Exclusively Produced π^+π^- and K^+K^- Pairs in pp Collisions at √s=510 GeV
AU  - Aranya Giri
AU  - Barak Schmookler
AU  - Rene Bellwied
PY  - 2026
DA  - 2026/11/04
PB  - arXiv
DO  - 10.48550/arxiv.2611.07086
UR  - https://arxiv.org/abs/2611.07086
AB  - We present an amplitude analysis of the π^+π^− and K^+K^− invariant-mass spectra from central exclusive pp collisions at √s=510 GeV, measured by the STAR experiment with forward-scattered protons tagged in the Roman Pot detectors. The π^+π^− channel is described with f_0(500), ρ^0(770), f_0(980), f_2(1270), f_0(1500) and f_0(1710) resonances with χ^2/ndf=121.712/57. The fit also yields m_f_0(980)=0.989 GeV and Γ=0.091 GeV. The K^+K^− channel is described with f_0(980), f_2(1270), f_2^′(1525) and f_0(1710) resonances with χ^2/ndf=14.662/15. The fiducial cross sections for the individual resonances and interference terms were calculated, together with their ratios relative to the total fitted cross section. These ratios were compared across decay channels and qualitatively with previous measurements. A consistent flavor dependence of f_0(1500) and f_0(1710) has been derived for the highest RHIC collision energies, which is in agreement with low energy data.
ER  -