Draft:Wen-Chen Chang (physicist)
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Wen-Chen Chang | |
|---|---|
章文箴 | |
| Alma mater | National Taiwan University State University of New York at Stony Brook |
| Awards | Fellow of the Physical Society of Taiwan (2021) National Science and Technology Council Outstanding Research Award (2023) |
| Scientific career | |
| Fields | Nuclear physics, hadron physics |
| Workplaces | Academia Sinica |
Wen-Chen Chang (Chinese: 章文箴; pinyin: Zhāng Wénzhēn) is an experimental nuclear physicist and research fellow at the Institute of Physics, Academia Sinica, in Taiwan.[1] His research concerns hadron structure and non-perturbative quantum chromodynamics, including low-energy phi meson photoproduction and quark and antiquark distributions in nucleons and mesons.[2][3] The Physical Society of Taiwan elected him a fellow in 2021, citing contributions to low-energy phi-meson photoproduction and the use of the Drell–Yan process to study proton quark structure.[3] He received the National Science and Technology Council's 2023 Outstanding Research Award.[4]
Education and career
[edit]Chang received a bachelor's degree in physics from National Taiwan University in 1990 and a PhD in physics from the State University of New York at Stony Brook in 1997.[2] He subsequently held a postdoctoral position at the University of California, Riverside before joining Academia Sinica's Institute of Physics in 1999.[5]
At Academia Sinica, he was an assistant research fellow from 1999 to 2004 and an associate research fellow from 2004 to 2015, when he became a research fellow.[2] He leads the Nuclear Physics group within the institute's Medium and High Energy Experimental Group.[6]
Research
[edit]Phi-meson photoproduction
[edit]Chang has studied phi-meson photoproduction near threshold with the LEPS experiment at SPring-8. He coauthored a 2005 Physical Review Letters measurement from proton targets and was first author of a 2008 Physics Letters B measurement from deuteron targets.[7][8] In 2010, he was first author of a Physical Review C study of spin-density matrix elements in phi photoproduction from proton and deuteron targets.[9] The Physical Society of Taiwan cited his contributions to low-energy phi-meson photoproduction when it elected him a fellow in 2021.[3]
Hadron structure and Drell–Yan physics
[edit]Chang and Jen-Chieh Peng published a 2011 Physical Review Letters paper using an intrinsic five-quark model to study the light-quark flavor asymmetry of the nucleon sea. They interpreted qualitative agreement with existing measurements as evidence for intrinsic light-quark components in nucleons.[10] In 2012, Keh-Fei Liu, Chang, Hai-Yang Cheng and Peng used lattice-QCD and phenomenological inputs to distinguish connected and disconnected components of sea-parton distributions.[11] Chang and Peng later reviewed nucleon-sea flavor structure in Progress in Particle and Nuclear Physics.[12]
Chang's later phenomenological work has included fixed-target Drell–Yan angular distributions and pion parton distributions. A 2019 study examined lepton angular distributions and the Lam–Tung relation in fixed-target Drell–Yan experiments.[13] Papers in 2020 and 2023 used pion-induced charmonium production to constrain the pion's parton distributions, including its gluon distribution.[14][15]
Chang was a member of the E906/SeaQuest collaboration at Fermilab. In 2021, the collaboration reported in Nature that down antiquarks were more abundant than up antiquarks throughout the measured momentum range; Chang was a coauthor.[16] Independent commentary in Nature and Physics Today discussed the result as evidence against the apparent high-momentum flavor reversal in the earlier NuSea data.[17][18] The collaboration's final result, published as an Editors' Suggestion in Physical Review Letters in 2026, again found more down antiquarks than up antiquarks throughout the measured range, with improved statistical accuracy.[19]
Honors and awards
[edit]References
[edit]- ↑ "Chang, Wen-Chen / Research Fellow". Institute of Physics, Academia Sinica. Retrieved 21 September 2026.
- 1 2 3 "章文箴 Wen-Chen Chang". National Science and Technology Council (in Traditional Chinese). Retrieved 21 September 2026.
- 1 2 3 4 "會士歷屆名錄" [List of fellows]. Physical Society of Taiwan (in Traditional Chinese). Retrieved 21 September 2026.
- 1 2 "Dr. Wen-Chen Chang for receiving the 2023 Outstanding Research Award, National Science and Technology Council". Institute of Physics, Academia Sinica. 1 March 2024. Retrieved 21 September 2026.
- ↑ "章文箴 博士" [Dr. Wen-Chen Chang]. Taiwan Top Science Student Project (in Traditional Chinese). National Central University. Retrieved 21 September 2026.
- ↑ "Medium and High Energy Experimental Group". Institute of Physics, Academia Sinica. Retrieved 21 September 2026.
- ↑ Mibe, T.; Chang, W. C.; et al. (2005). "Near-Threshold Diffractive φ-Meson Photoproduction from the Proton". Physical Review Letters. 95 182001. doi:10.1103/PhysRevLett.95.182001.
- ↑ Chang, W. C.; et al. (2008). "Forward coherent φ-meson photoproduction from deuterons near threshold". Physics Letters B. 658: 209–215. doi:10.1016/j.physletb.2007.11.009.
- ↑ Chang, W. C.; et al. (2010). "Measurement of spin-density matrix elements for φ-meson photoproduction from protons and deuterons near threshold". Physical Review C. 82 015205. doi:10.1103/PhysRevC.82.015205.
- ↑ Chang, Wen-Chen; Peng, Jen-Chieh (2011). "Flavor Asymmetry of the Nucleon Sea and the Five-Quark Components of the Nucleons". Physical Review Letters. 106 252002. doi:10.1103/PhysRevLett.106.252002.
- ↑ Liu, Keh-Fei; Chang, Wen-Chen; Cheng, Hai-Yang; Peng, Jen-Chieh (2012). "Connected-Sea Partons". Physical Review Letters. 109 252002. doi:10.1103/PhysRevLett.109.252002.
- ↑ Chang, Wen-Chen; Peng, Jen-Chieh (2014). "Flavor structure of the nucleon sea". Progress in Particle and Nuclear Physics. 79: 95–135. doi:10.1016/j.ppnp.2014.08.002.
- ↑ Chang, Wen-Chen; McClellan, Randall Evan; Peng, Jen-Chieh; Teryaev, Oleg (2019). "Lepton angular distributions of fixed-target Drell–Yan experiments in perturbative QCD and a geometric approach". Physical Review D. 99 014032. doi:10.1103/PhysRevD.99.014032.
- ↑ Chang, Wen-Chen; Peng, Jen-Chieh; Platchkov, Stephane; Sawada, Takahiro (2020). "Constraining gluon density of pions at large x by pion-induced J/ψ production". Physical Review D. 102 054024. doi:10.1103/PhysRevD.102.054024.
- ↑ Chang, Wen-Chen; Peng, Jen-Chieh; Platchkov, Stephane; Sawada, Takahiro (2023). "Fixed-target charmonium production and pion parton distributions". Physical Review D. 107 056008. doi:10.1103/PhysRevD.107.056008.
- ↑ Dove, J.; et al. (2021). "The asymmetry of antimatter in the proton". Nature. 590: 561–565. doi:10.1038/s41586-021-03282-z.
- ↑ Gao, Haiyan (2021). "Antimatter in the proton is more down than up". Nature. 590: 559–560. doi:10.1038/d41586-021-00430-3.
- ↑ Miller, Johanna L. (12 April 2021). "The puzzling asymmetry of the proton sea". Physics Today. doi:10.1063/PT.6.1.20210412a. Retrieved 21 September 2026.
- ↑ Leung, C. H.; et al. (2026). "Final SeaQuest Results on the Flavor Asymmetry of the Proton Light-Quark Sea with Proton-Induced Drell-Yan Process". Physical Review Letters. 136 171901. doi:10.1103/fdrg-gw3s.
External links
[edit]- Wen-Chen Chang at the Institute of Physics, Academia Sinica