Search NASAβŒ• Search
Home/Archive/DOE OSTI

DOE OSTI Β· 3172449

𝜌-meson nucleon scattering length from CLAS threshold photoproduction measurements

Strakovsky, Igor I. [George Washington Univ., Washington, DC (United States)] (ORCID:0000000185869482)Β·Isupov, Evgeny L. [Lomonosov Moscow State Univ., Moscow (Russian Federation)] (ORCID:0000000175242408)Β·Mokeev, Victor [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)] (ORCID:0000000245571320)Β·Schmidt, Axel [George Washington Univ., Washington, DC (United States)] (ORCID:0000000211092954)
View original source β†—Read source document β†—Export metadata ↓

Abstract

Here, extending our study of the vector meson-nucleon scattering lengths, we are focusing on the 𝜌-meson case using recent CLAS threshold data for the reaction 𝛾⁒𝑝 β†’πœŒβ’π‘ within the meson–baryon reaction model. The total 𝜎 𝑑 ⁑(𝛾⁒𝑝 β†’πœŒβ’π‘) and 𝜎 𝑑⁑ (𝛾⁒𝑝 β†’πœ”β’π‘) cross sections are close to the momentum of the vector meson in CM π‘ž =0.2 GeV/c. Then the πœŒβ’π‘ photoproduction cross section grows rapidly. Our result for πœŒβ’π‘ scattering length is a factor of 4 smaller than the size of the hadron and the phenomenological determination of the πœ” nucleon scattering length using threshold photoproduction cross sections. The observed difference between πœŒβ’π‘ and πœ”β’π‘ scattering lengths is of interest for further understanding within hadron structure theory.

Explore related subjects

Phenomenologyphenomenology

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Strakovsky, Igor I. [George Washington Univ., Washington, DC (United States)] (ORCID:0000000185869482), Isupov, Evgeny L. [Lomonosov Moscow State Univ., Moscow (Russian Federation)] (ORCID:0000000175242408), Mokeev, Victor [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)] (ORCID:0000000245571320), Schmidt, Axel [George Washington Univ., Washington, DC (United States)] (ORCID:0000000211092954). 2025-12-26. 𝜌-meson nucleon scattering length from CLAS threshold photoproduction measurements. https://doi.org/10.1103/f79z-5381

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2025

Shear viscosity from perturbative quantum chromodynamics to the hadron resonance gas at finite baryon, strangeness, and electric charge densities

Through model-to-data comparisons from heavy-ion collisions, it has been shown that the quark gluon plasma has an extremely small shear viscosity at vanishing densities. At large baryon densities, significantly less is known about the nature of the shear viscosity from quantum chromodynamics (QCD). Within heavy-ion collisions, there are three conserved charges: baryon number (B), strangeness (S), and electric charge (Q). Here we calculate the shear viscosity in two limits using perturbative QCD (pQCD) and an excluded-volume hadron resonance gas at finite BSQ densities. We then develop a framework that interpolates between these two limits such that shear viscosity is possible to calculate across a wide range of finite BSQ densities. We find that the pQCD and hadron resonance gas calculations have different BSQ density dependencies such that a rather nontrivial shear viscosity appears at finite densities.

Phenomenology↗
DOE OSTI2024

Transverse spin asymmetries and the electron Yukawa coupling at an FCC-ee

We show that measurements of single transverse-spin asymmetries at an 𝑒 + ⁒𝑒 βˆ’ collider can enhance the sensitivity to the electron Yukawa coupling, possibly enabling observation of the Standard Model value for this quantity. We demonstrate that the significance in both the 𝑏⁒$\overline{𝑏}$ and semileptonic π‘Šβ’π‘Š final states can be enhanced by factors of up to 3 compared to inclusive cross-section determinations of this coupling for transversely polarized electrons. If the positrons can be simultaneously longitudinally polarized, even at the level of 30%, the significance can be enhanced by a factor of 5 or more. The method utilizes quantum interference between the Higgs signal and the continuum background and is also applicable in other π‘Šβ’π‘Š and 𝑍⁒𝑍 final states.

Phenomenology↗