Partonic structure of neutral pseudoscalars via two photon transition form factors
Abstract
Here, the γγ* → ηc,b transition form factors are computed using a continuum approach to the two valence-body bound-state problem in relativistic quantum field theory, and thereby unified with equivalent calculations of electromagnetic pion elastic and transition form factors. The resulting γγ* → ηc form factor, Gηc(Q2), is consistent with available data; significantly, at accessible momentum transfers, Q2Gηc(Q2) lies well below its conformal limit. These observations confirm that the leading-twist parton distribution amplitudes of heavy-heavy bound states are compressed relative to the conformal limit. A clear understanding of the distribution of valence quarks within mesons thus emerges, a picture which connects Goldstone modes, built from the lightest quarks in nature, with systems containing the heaviest valence quarks that can now be studied experimentally, and highlights basic facts about manifestations of mass within the Standard Model.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1374604
- Alternate Identifier(s):
- OSTI ID: 1351044
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 7; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Raya, Khepani, Ding, Minghui, Bashir, Adnan, Chang, Lei, and Roberts, Craig D. Partonic structure of neutral pseudoscalars via two photon transition form factors. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.95.074014.
Raya, Khepani, Ding, Minghui, Bashir, Adnan, Chang, Lei, & Roberts, Craig D. Partonic structure of neutral pseudoscalars via two photon transition form factors. United States. https://doi.org/10.1103/PhysRevD.95.074014
Raya, Khepani, Ding, Minghui, Bashir, Adnan, Chang, Lei, and Roberts, Craig D. Mon .
"Partonic structure of neutral pseudoscalars via two photon transition form factors". United States. https://doi.org/10.1103/PhysRevD.95.074014. https://www.osti.gov/servlets/purl/1374604.
@article{osti_1374604,
title = {Partonic structure of neutral pseudoscalars via two photon transition form factors},
author = {Raya, Khepani and Ding, Minghui and Bashir, Adnan and Chang, Lei and Roberts, Craig D.},
abstractNote = {Here, the γγ* → ηc,b transition form factors are computed using a continuum approach to the two valence-body bound-state problem in relativistic quantum field theory, and thereby unified with equivalent calculations of electromagnetic pion elastic and transition form factors. The resulting γγ* → ηc form factor, Gηc(Q2), is consistent with available data; significantly, at accessible momentum transfers, Q2Gηc(Q2) lies well below its conformal limit. These observations confirm that the leading-twist parton distribution amplitudes of heavy-heavy bound states are compressed relative to the conformal limit. A clear understanding of the distribution of valence quarks within mesons thus emerges, a picture which connects Goldstone modes, built from the lightest quarks in nature, with systems containing the heaviest valence quarks that can now be studied experimentally, and highlights basic facts about manifestations of mass within the Standard Model.},
doi = {10.1103/PhysRevD.95.074014},
journal = {Physical Review D},
number = 7,
volume = 95,
place = {United States},
year = {Mon Apr 10 00:00:00 EDT 2017},
month = {Mon Apr 10 00:00:00 EDT 2017}
}
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