2023/11/15 by Wei Kou, Xurong Chen, Kou, Wei +1
Medicine · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Radiation Therapy and Dosimetry
paper · pdf · doi:10.48550/arxiv.2311.08789
openalex publication_date 2023/11/15 · openalex created_date 2023/11/17 · openalex updated_date 2026/07/28
This study delves into the contribution of the strange quark within the proton, which influences several fundamental proton properties. By establishing a robust relationship between the proton's quantum anomalous energy and the sigma term, we successfully extract the contribution of the strangeness sigma term in the proton, obtaining it from parameterized fits of the differential cross-section using exponential and dipole forms. The extracted sigma term values are estimated to be 455.62±64.60 MeV (exponential fit) and 337.74±106.79 MeV (dipole fit). Additionally, we present novel results for the proton trace anomalous energy, observing values of 0.13±0.02 (exponential fit) and 0.15 ± 0.03 (dipole fit). Our analysis integrates the novel data from the J/ψ-007 and GlueX collaborations, to some extent providing an experimental phenomenological window into the non-zero strange quark content inside proton, with the statistical significances: 7.1σ (exponential fit) and 3.2σ (dipole fit), respectively. Furthermore, we discussed the possibility of scheme-independence in the extraction results and examine the uniformity of sigma terms obtained from the datasets provided by the two collaborations. Our analysis may reveals compatibility between the extracted results of the respective experiments.