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Title: New spin structure constraints on hyperfine splitting and proton Zemach radius

Journal Article · · Physics Letters. B
ORCiD logo [1];  [1];  [2];  [3];  [4];  [5];  [2];  [6];  [7];  [8];  [1];  [9]
  1. Univ. of New Hampshire, Durham, NH (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. College of William and Mary, Williamsburg, VA (United States)
  4. Johannes Gutenberg Univ., Mainz (Germany); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  5. Johannes Gutenberg Univ., Mainz (Germany)
  6. Old Dominion Univ., Norfolk, VA (United States)
  7. Istituto Nazionale di Fisica Nucleare (INFN), Genova (Italy)
  8. Univ. of Virginia, Charlottesville, VA (United States)
  9. Duke Univ., Durham, NC (United States)
+ Show Author Affiliations

The 1S hyperfine splitting in hydrogen is measured to an impressive ppt precision and will soon be measured to ppm precision in muonic hydrogen. The latter measurement will rely on theoretical predictions, which are limited by knowledge of the proton polarizability effect $$\Delta_{pol}$$. Data-driven evaluations of $$\Delta_{pol}$$ have long been in significant tension with baryon chiral perturbation theory. Here we present improved results for $$\Delta_{pol}$$ driven by new spin structure data, reducing the long-standing tension between theory and experiment and halving the dominating uncertainty in hyperfine splitting calculations.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
National Science Foundation (NSF); Swiss National Science Foundation (SNSF); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-06OR23177; FG02-88ER40410; SC0014434; SC0024665
OSTI ID:
2476562
Report Number(s):
DOE/OR/23177-7751; JLAB-PHY--24-4247
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Vol. 859; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (31)

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS