Chang, Wen-Chen / Research Fellow

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Contact Information

Education

  • Ph. D., SUNY at Stony Brook, U.S

Secretary

Chen, Vicky / 886-2-2789-8948

wcchen [at] phys.sinica.edu.tw

Research Interest

  • Quark Nuclear Physics
  • Hadron Physics
  • Relativistic Heavy Ion Collisions

獎項及殊榮

(1) 國內學術研究獎項 2024-04 國科會-傑出研究獎（2023年）
(2) 國內學術研究獎項 2021-12 台灣物理學會會士（2021年）

Experience

  • Associate Research Fellow, Academia Sinica (2004-2015)
  • Assistant Research Fellow, Academia Sinica (1999-2004)

Research Achievements

Journal Papers

  • [1]     Aoki Kazuya, Ashikaga Sakiko, Chang Wen-Chen, Chujo Tatsuya, Ejima Ren, En’yo Hideto, Esumi Shinichi, Rodriguez Garces Dairon, Hamagaki Hideki, Heuser Johann M., Honda Ryotaro, Ichikawa Masaya, Ishii Daichi, Kajikawa Shunsuke, Kakunaga Jo, Kanno Koki, Kiyomichi Akio, Hori Yusuke, Lin Chih-Hsun, Morino Yuhei, Murakami Tomoki N., Muto Ryotaro, Nagafusa Shunnosuke, Nakai Wataru, Nakasuga Satomi, Naruki Megumi, Nonaka Toshihiro, Noumi Hiroyuki, Ochiai Shuta, Ogura Makoto, Ozawa Kyoichiro, Rodriguez Rodriguez Adrian, Sakaguchi Takao, Sako Hiroyuki, Sakuma Fuminori, Sato Susumu, Sawada Shinya, Sekimoto Michiko, Shigaki Kenta, Shirotori Kotaro, Sugimura Hitoshi, Takahashi Tomonori N., Taniguchi Tomohiro, Teklishyn Maksym, Toia Alberica, Yamada Rento, Yamaguchi Kanako H., Yamaguchi Yorito L., Yanai Shogo, Yokkaichi Satoshi, 2025, “Experimental investigation of vector mesons in medium through dielectron decay at J-PARC”, Journal of Subatomic Particles and Cosmology, 3, 100019.

  • [2]     Sako Hiroyuki, Aoki Kazuya, Chang Wen-Chen, Chu Ming-Lee, Chujo Tatsuya, Esumi ShinIchi, Ichikawa Masaya, Inaba Motoi, Miake Yasuo, Morino Yuhei, Naruki Megumi, Nonaka Toshihiro, Ozawa Kyoichiro, Sakaguchi Takao, Sato Susumu, Takahashi Tomonori, Yokkaichi Satoshi, 2024, “Experimental studies of in-medium modification of ϕ meson mass through ϕ→K+K− decays”, Journal of Subatomic Particles and Cosmology, 1-2, 100012.

  • [3]     C.H. Leung et al. SeaQuest/E906 Collaboration, 2024, “Measurement of J/ψ and ψ(2S) production in p + p and p + d interactions at 120 GeV”, Physics Letters B, 858, 139032. (SCIE) (IF: 4.3; SCI ranking: 26.1%,15.8%,31%)

  • [4]     Alexeev G. D. et al. COMPASS Collaboration, 2024, “High-Statistics Measurement of Collins and Sivers Asymmetries for Transversely Polarized Deuterons”, Physical Review Letters, 133(10), 101903. (SCIE) (IF: 8.6; SCI ranking: 10.6%)

  • [5]     Alexeev G. D. et al. COMPASS Collaboration, 2024, “Final COMPASS Results on the Transverse-Spin-Dependent Azimuthal Asymmetries in the Pion-Induced Drell-Yan Process”, Physical Review Letters, 133(7), 071902. (SCIE) (IF: 8.6; SCI ranking: 10.6%)

  • [6]     Chang Wen-Chen, Peng Jen-Chieh, Platchkov Stephane, Sawada Takahiro, 2024, “Constraining kaon PDFs from Drell-Yan and J/ψ production”, Physics Letters B, 855, 138820. (SCIE) (IF: 4.3; SCI ranking: 26.1%,15.8%,31%)

  • [7]     Bourrely Claude, Buccella Franco, Chang Wen-Chen, Peng Jen-Chieh, 2023, “Extraction of Kaon Partonic Distribution Functions from Drell-Yan and J/ψ Production Data”, Physics Letters B, 848, 138395. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [8]     R. Uda et al., 2023, “Development of a precise time and position resolution TOF-tracker MRPC for the π20 beam line at J-PARC”, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1056, 168580.

  • [9]     N. Tomida et al., 2023, “Development of an 1-m long prototype TOF-RPC for the J-PARC π20 beam line”, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1056, 168581.

  • [10]     J. Dove et al. SeaQuest/E906 Collaboration, 2023, “Measurement of flavor asymmetry of the light-quark sea in the proton with Drell-Yan dimuon production in p+p and p+d collisions at 120 GeV”, Physical Review C, 108(3), 035202. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [11]     K. Aoki et al., 2023, “Experimental Study of In-medium Spectral Change of Vector Mesons at J-PARC”, Few-Body Systems, 64, 63. (SCIE) (IF: 1.844; SCI ranking: 60.5%)

  • [12]     Chang Wen-Chen, Hsieh Chia-Yu, Lian Yu-Shiang, Peng Jen-Chieh, Platchkov Stephane, Sawada Takahiro, 2023, “Pion PDFs confronted by fixed-target charmonium production”, AAPPS Bulletin, 33(1), 15.

  • [13]     N. Muramatsu et al. LEPS Collaboration, 2023, “First measurement of differential cross sections and photon beam asymmetries for photoproduction of the f0(980) meson decaying into π0π0 at Eγ=2.4 GeV”, Physical Review C, 107(4), L042201. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [14]     Chang Wen-Chen, Peng Jen-Chieh, Platchkov Stephane, Sawada Takahiro, 2023, “Fixed-target charmonium production and pion parton distributions”, Physical Review D, 107(5), 056008. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [15]     G.D. Alexeev et al. COMPASS Collaboration, 2023, “Double J/ψ production in pion-nucleon scattering at COMPASS”, Physics Letters B, 838, 137702. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [16]     T. Hashimoto et al. LEPS2/BGOegg Collaboration, 2022, “Differential cross sections and photon beam asymmetries of η photoproduction on the proton at Eγ=1.3–2.4 GeV”, Physical Review C, 106(3), 035201. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [17]     Bourrely Claude, Chang Wen-Chen, Peng Jen-Chieh, 2022, “Pion partonic distributions in a statistical model from pion-induced Drell-Yan and J/Ψ production data”, Physical Review D, 105(7), 076018. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [18]     N. Muramatsu et al. LEPS Collaboration, 2022, “SPring-8 LEPS2 beamline: A facility to produce a multi-GeV photon beam via laser Compton scattering”, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1033, 166677.

  • [19]     G.D. Alexeev et al. COMPASS Collaboration, 2022, “The exotic meson π1(1600) with JPC=1−+ and its decay into ρ(770)π”, Physical Review D, 105(1), 012005. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [20]     G.D. Alexeev et al. COMPASS Collaboration, 2021, “Probing transversity by measuring Λ polarisation in SIDIS”, Physics Letters B, 824, 136834. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [21]     Honda Ryotaro, Aramaki Takashi, Asano Hidemitsu, Akaishi Takaya, Chang W C, Igarashi Youichi, Ishikawa Takatsugu, Kajikawa Shunsuke, Ma Yue, Nagai Kei, Noumi Hiroyuki, Sako Hiroyuki, Shirotori Kotaro, Takahashi Tomonori, 2021, “Continuous timing measurement using a data-streaming DAQ system”, Progress of Theoretical and Experimental Physics, 2021(12), 123H01. (SCIE) (IF: 7.492; SCI ranking: 14%,13.8%)

  • [22]     G.D. Alexeev et al. COMPASS Collaboration, 2021, “Triangle Singularity as the Origin of the a1(1420)”, Physical Review Letters, 127, 082501. (SCIE) (IF: 9.185; SCI ranking: 9.3%)

  • [23]     Hsieh Chia-Yu, Lian Yu-Shiang, Chang Wen-Chen, Peng Jen-Chieh, Platchkov Stephane, Sawada Takahiro, 2021, “NRQCD analysis of charmonium production with pion and proton beams at fixed-target energies”, Chinese Journal of Physics, 73, 13-23. (SCIE) (IF: 3.957; SCI ranking: 30.2%)

  • [24]     Takahashi Tomonori, Aoki Kazuya, Ashikaga Sakiko, Chang Wen-Chen, Hamada Eitaro, Honda Ryotaro, Ichikawa Masaya, Ikeno Masahiro, Kajikawa Shunsuke, Kanno Koki, Kawama Daisuke, Kondo Takehito, Lin Che-Sheng, Lin Chih-Hsun, Morino Yuhei, Murakami Tomoki, Nakai Wataru, Nakasuga Satomi, Naruki Megumi, Obara Yuki, Ozawa Kyoichiro, Sako Hiroyuki, Sato Susumu, Sendai Hiroshi, Suzuki Kazuki, Takaura Yudai, Tanaka Manobu, Uchida Tomohisa, Yokkaichi Satoshi, 2021, “Data Acquisition System in the First Commissioning Run of the J-PARC E16 Experiment”, IEEE Transactions on Nuclear Science, 68(8), 1907-1911. (SCIE) (IF: 1.703; SCI ranking: 72.3%,52.9%)

  • [25]     J. Dove at al. SeaQuest/E906 Collaboration, 2021, “The asymmetry of antimatter in the proton”, Nature, 590(7847), 561-565. (SCIE) (IF: 69.504; SCI ranking: 1.4%)

  • [26]     Lyu Yang, Chang Wen-Chen, McClellan Randall Evan, Peng Jen-Chieh, Teryaev Oleg, 2021, “Lepton angular distribution of W boson productions”, Physical Review D, 103(3), 034011. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [27]     G.D. Alexeev et al. COMPASS Collaboration, 2021, “Spin density matrix elements in exclusive meson muoproduction”, The European Physical Journal C, 81(2), 126. (SCIE) (IF: 4.994; SCI ranking: 27.6%)

  • [28]     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(5). (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [29]     N. Muramatsu et al. LEPS Collaboration, 2020, “Differential cross sections, photon beam asymmetries, and spin density matrix elements of ω photoproduction off the proton at Eγ=1.3−2.4 GeV”, Physical Review C, 102(2). (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [30]     G.D. Alexeev et al. COMPASS Collaboration, 2020, “Antiproton over proton and K− over K+ multiplicity ratios at high z in DIS”, Physics Letters B, 807 135600. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [31]     J. Agarwala et al. COMPASS Collaboration, 2020, “Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS”, Nuclear Physics B, 956 115039. (SCIE) (IF: 3.045; SCI ranking: 44.8%)

  • [32]     G.D. Alexeev et al. COMPASS Collaboration, 2020, “Measurement of the cross section for hard exclusive π0 muoproduction on the proton”, Physics Letters B, 805 135454. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [33]     N. Tomida et al. LEPS2/BGOegg Collaboration, 2020, “Search for η′ Bound Nuclei in the C12(γ,p) Reaction with Simultaneous Detection of Decay Products”, Physical Review Letters, 124(20) , 202501. (SCIE) (IF: 9.185; SCI ranking: 9.3%)

  • [34]     N. Muramatsu et al. LEPS Collaboration, 2019, “Measurement of neutral pion photoproduction off the proton with the large acceptance electromagnetic calorimeter BGOegg”, Physical Review C, 100(5). (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [35]     Peng Jen-Chieh, Chang Wen-Chen, McClellan Randall Evan, Teryaev Oleg, 2019, “Lepton angular distribution of Z boson production and jet discrimination”, Physics Letters B, 797 134895. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [36]     A. Adare et al. PHENIX Collaboration, 2019, “Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions”, Physical Review Letters, 123(2) 022301. (SCIE) (IF: 9.185; SCI ranking: 9.3%)

  • [37]     R. Akhunzyanov et al. COMPASS Collaboration, 2019, “Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section”, Physics Letters B, 793, 188-194. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [38]     C.A. Aidala et al. SeaQuest Collaboration, 2019, “The SeaQuest spectrometer at Fermilab”, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 930, 49-63.

  • [39]     Watanabe K., Tanaka S., Chang W.C., Chen H., Chu M.L., Cuenca-García J.J., Gogami T., González-Díaz D., Niiyama M., Ohashi Y., Ohnishi H., Tomida N., Yosoi M., 2019, “A compensated multi-gap RPC with 2 m strips for the LEPS2 experiment”, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 925, 188-192.

  • [40]     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(1), 014032. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [41]     M.G. Alexeev et al. COMPASS Collaboration, 2018, “Measurement of P-weighted Sivers asymmetries in leptoproduction of hadrons”, Nuclear Physics B, 940, 34-53. (SCIE) (IF: 3.045; SCI ranking: 44.8%)

  • [42]     Peng Jen-Chieh, Boer Daniël, Chang Wen-Chen, McClellan Randall Evan, Teryaev Oleg, 2018, “On the rotational invariance and non-invariance of lepton angular distributions in Drell–Yan and quarkonium production”, Physics Letters B, 789, 356-359. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [43]     R. Akhunzyanov et al. COMPASS Collaboration, 2018, “K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy”, Physics Letters B, 786 390-398. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [44]     M. Aghasyan et al. COMPASS Collaboration, 2018, “Light isovector resonances in π−p→π−π−π+p at 190  GeV/c”, Physical Review D, 98(9). (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [45]     C. Adolph et al. COMPASS Collaboration, 2018, “Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons”, The European Physical Journal C, 78(11). (SCIE) (IF: 4.994; SCI ranking: 27.6%)

  • [46]     M. Aghasyan et al. COMPASS Collaboration, 2018, “Search for muoproduction of X (3872) at COMPASS and indication of a new state X˜(3872)”, Physics Letters B, 783, 334-340. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [47]     H. Kohri, S.H. Shiu, W.C. Chang, Y. Yanai et al. LEPS Collaboration, 2018, “Differential Cross Section and Photon-Beam Asymmetry for the γ→p → π−Δ++(1232) Reaction at Forward π− Angles for Eγ=1.5–2.95  GeV”, Physical Review Letters, 120(20), 202004. (SCIE) (IF: 9.185; SCI ranking: 9.3%)

  • [48]     M. Aghasyan et al. COMPASS Collaboration, 2018, “Longitudinal double-spin asymmetry A1p and spin-dependent structure function g1p of the proton at small values of x and Q 2”, Physics Letters B, 781, 464-472. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [49]     T. Hiraiwa et al. LEPS Collaboration, 2018, “First measurement of coherent ϕ -meson photoproduction from He4 near threshold”, Physical Review C, 97(3), 035208. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [50]     M. Aghasyan et al. COMPASS Collaboration, 2018, “New analysis of ηπ tensor resonances measured at the COMPASS experiment”, Physics Letters B, 779, 464-472. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [51]     M. Aghasyan et al. COMPASS Collaboration, 2018, “Transverse-momentum-dependent multiplicities of charged hadrons in muon-deuteron deep inelastic scattering”, Physical Review D, 97(3), 032006. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [52]     H. Kohri, S.Y. Wang, S.H. Shiu, W.C. Chang, Y. Yanai et al. LEPS Collaboration, 2018, “Differential cross section and photon-beam asymmetry for the γ⃗p→π+n reaction at forward π+ angles at Eγ=1.5 –2.95 GeV”, Physical Review C, 97, 015205. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [53]     S.H. Shiu, H. Kohri, W.C. Chang et al. LEPS Collaboration, 2018, “Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ=1.5–3.0 GeV”, Physical Review C, 97(1), 015208. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [54]     K. Mizutani et al. LEPS Collaboration, 2017, “ϕ photoproduction on the proton at Eγ=1.5–2.9GeV”, Physical Review C, 96, 062201. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [55]     Chang Wen-Chen, McClellan Randall Evan, Peng Jen-Chieh, Teryaev Oleg, 2017, “Dependencies of lepton angular distribution coefficients on the transverse momentum and rapidity of Z bosons produced in pp collisions at the LHC”, Physical Review D, 96(5), 054020. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [56]     M. Aghasyan et al. COMPASS Collaboration, 2017, “First Measurement of Transverse-Spin-Dependent Azimuthal Asymmetries in the Drell-Yan Process”, Physical Review Letters, 119(11), 112002. (SCIE) (IF: 9.185; SCI ranking: 9.3%)

  • [57]     A. Adare et al. PHENIX Collaboration, 2017, “Measurements of e+e− pairs from open heavy flavor in p+p and d+A collisions at sNN=200 GeV”, Physical Review C, 96(2), 024907. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [58]     C. Adolph et al. COMPASS Collaboration, 2017, “First measurement of the Sivers asymmetry for gluons using SIDIS data”, Physics Letters B, 772, 854-864. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [59]     C. Adolph et al. COMPASS Collaboration, 2017, “Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS”, Physics Letters B, 770, 138-145. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [60]     C. Adolph et al. COMPASS Collaboration, 2017, “Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data”, EUROPEAN JOURNAL OF PHYSICS, 77, 209. (SCIE) (IF: 0.883; SCI ranking: 88.6%,82.6%)

  • [61]     C. Adolph et al. COMPASS Collaboration, 2017, “Final COMPASS results on the deuteron spin-dependent structure function g1d and the Bjorken sum rule”, PHYSICS LETTERS B, 769, 34-41. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [62]     C. Adolph et al. COMPASS Collaboration, 2017, “Resonance production and ππ S -wave in π−+p→π−π−π++precoil at 190  GeV/c”, Physical Review D, 95(3), 032004. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [63]     C. Adolph et al. COMPASS Collaboration, 2017, “Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target”, Physics Letters B, 767, 133-141. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [64]     C. Adolph et al. COMPASS Collaboration, 2016, “Exclusive ω meson muoproduction on transversely polarised protons”, Nuclear Physics B, 915, 454-475. (SCIE) (IF: 3.045; SCI ranking: 44.8%)

  • [65]     C. Adolph et al. COMPASS Collaboration, 2016, “Multiplicities of charged pions and charged hadrons from deep-inelastic scattering of muons off an isoscalar target”, PHYSICS LETTERS B, 764, 1. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [66]     T. Sawada, W.C. Chang, S. Kumano, J.C. Peng, S. Sawada and K. Tanaka, 2016, “Accessing proton generalized parton distributions and pion distribution amplitudes with the exclusive pion-induced Drell-Yan process at J-PARC”, PHYSICAL REVIEW D, 93, 114034 (2016). (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [67]     S.Y. Ryu et al. LEPS Collaboration, 2016, “Interference effect between φ and Λ(1520) production channels in the γp→K + K − p reaction near threshold”, PHYSICAL REVIEW LETTERS, 116, 232001. (SCIE) (IF: 9.185; SCI ranking: 9.3%)

  • [68]     J.C. Peng, W.C. Chang, R.E. McClellan and O. Teryaev, 2016, “Interpretation of Angular Distributions of Z-boson Production at Colliders”, PHYSICS LETTERS B, 758, 384-388. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [69]     D.J. Yang, F.J. Jiang, W.C. Chang, C.W. Kao and S.i. Nam, 2016, “Consistency check of charged hadron multiplicities and fragmentation functions in SIDIS”, PHYSICS LETTERS B, 755, 393-402. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [70]     W.C. Chang, S. Kumano and T. Sekihara, 2016, “Constituent-counting rule in photoproduction of hyperon resonances”, PHYSICAL REVIEW D, 93, 034006. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [71]     C. Adolph et al. COMPASS Collaboration, 2015, “Interplay among transversity induced asymmetries in hadron leptoproduction ”, PHYSICS LETTERS B, 753, 406-411. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [72]     C. Adolph et al. COMPASS Collaboration, 2015, “Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT ”, PHYSICS LETTERS B, 753, 573-579. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [73]     C. Adolph et al. COMPASS Collaboration, 2015, “The spin structure function g1p of the proton and a test of the Bjorken sum rule”, PHYSICS LETTERS B, 753, 18. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [74]     A. Adare et al. PHENIX Collaboration, 2015, “Measurements of elliptic and triangular flow in high-multiplicity 3He+Au collisions at sqrt(s)NN=200 GeV”, PHYSICAL REVIEW LETTERS, 115, 142301. (SCIE) (IF: 9.185; SCI ranking: 9.3%)

  • [75]     W.C. Chang and J.C. Peng, 2015, “Extraction of the intrinsic light-quark sea in the proton”, PHYSICAL REVIEW D, 92, 054020. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

  • [76]     S.H. Shiu, J.Y. Wu, R.E. McClellan, T.H. Chang, W.C. Chang, Y.C. Chen, R. Gilman, K. Nakano, J.C. Peng, S.Y. Wang, 2015, “FPGA-based Trigger System for the Fermilab SeaQuest Experiment”, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 802, 82. (SCIE) (IF: 1.335; SCI ranking: 81.3%,67.6%,78.9%,82.8%)

  • [77]     C. Adolph et al. COMPASS Collaboration, 2015, “Observation of a New Narrow Axial-Vector Meson a1(1420)”, PHYSICAL REVIEW LETTERS, 115, 082001. (SCIE) (IF: 9.185; SCI ranking: 9.3%)

  • [78]     A. Adare et al. PHENIX Collaboration, 2015, “Search for dark photons from neutral meson decays in p+pand d+Au collisions at sqrt(s)NN= 200 GeV”, PHYSICAL REVIEW C, 91, 031901. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [79]     A. Adare et al. PHENIX Collaboration, 2015, “Measurement of Υ (1S+2S+3S) production in p + p and Au+ Au collisions at sqrt(s)NN= 200 GeV”, PHYSICAL REVIEW C, 91, 024913. (SCIE) (IF: 3.199; SCI ranking: 31.6%)

  • [80]     Y. Morino et al. LEPS Collaboration, 2015, “Backward-angle photoproduction of ω and η′ mesons from protons at Eγ=1.5−3.0 GeV”, Progress of Theoretical and Experimental Physics, 013D01. (SCIE) (IF: 7.492; SCI ranking: 14%,13.8%)

  • [81]     S.Y. Wang, J.Y. Wu, S.H. Yao, and W.C. Chang, 2014, “A Field-Programmable Gate Array (FPGA) TDC for Fermilab SeaQuest (E906) Experiment and its Test with a Novel External Wave Union Launcher”, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 61, 3592. (SCIE) (IF: 1.703; SCI ranking: 72.3%,52.9%)

  • [82]     Wen-Chen Chang and Jen-Chieh Peng, 2014, “Flavor structure of the nucleon sea”, PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, 79, 95-135. (SCIE) (IF: 12.425; SCI ranking: 10.5%,10.3%)

  • [83]     J.C. Peng, W.C. Chang, H.Y. Cheng, T.J. Hou, K.F. Liu and J.-W. Qiu, 2014, “On the momentum dependence of the flavor structure of the nucleon sea”, PHYSICS LETTERS B, 736, 411. (SCIE) (IF: 4.95; SCI ranking: 27.5%,21.1%,31%)

  • [84]     A. Adare et al. PHENIX Collaboration, 2014, “Measurement of transverse-single-spin asymmetries for midrapidity and forward-rapidity production of hadrons in polarized p+p collisions at sqrt(s)=200 and 62.4 GeV ”, PHYSICAL REVIEW D, 90, 012006. (SCIE) (IF: 5.407; SCI ranking: 23.2%,24.1%)

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發現與突破

  • [1]     西元年：2021
    研究人員(中)：章文箴、陳彥竹、永井慧、蘇大順、王素音
    研究人員(英)：CHANG, WEN-CHEN, Andrew Yen-Chu Chen, Kei Nagai, Da-Shung Su and Su-Yin Grass Wang
    研究成果名稱(中)：質子內反夸克成分不對稱性的探討
    研究成果名稱(英)：Exploring antiquark asymmetry in the proton
    簡要記述(中)：質子和中子構成了原子核，是宇宙可見物質最主要的質量來源。對於它們的認識，由早期的三夸克系統，深入到一維縱向動量(x)分布，及包含橫向空間或橫向動量的多維分布描述。在質子／中子的內部，存在有反夸克粒子，它們是來自強作用力載子膠子的分裂；利用 Drell-Yan過程，NuSea/E866實驗發現在x=0.02-0.3區間，反d夸克多於反u夸克，但在大動量x區間，這大小比例有反轉的趨勢，這一觀察與造成反夸克不對稱性介子雲機制的理解不符合。從2008年起，由中研院物理所和高師大物理系組成的台灣研究團隊，參加美國費米實驗室SeaQuest/E906實驗，將反夸克不對稱性量測的敏感區域向大動量方向推進。量測的結果發表在國際期刊 Nature 590, 561 (2021) 。我們精準的結果證實反d夸克多於反u夸克的現象一直延伸到大動量x的區域，無先前所觀察的反轉。這個量測結果，對CERN大強子實驗在找尋新物理時所建立的標準模型基礎，將有重大影響。對此結果，中研院物理所的團隊在資料分析和實驗電子數位訊號模組建造上提供重要的貢獻。
    簡要記述(英)：Protons and neutrons, the components of every nucleus, are the dominating mass carriers of our visible universe. Our understanding of protons/neutrons has been evolving from a simple 3-quark structure to the 1d longitudinal momentum fraction (x) distributions of quark/gluon and the multi-dimensional distributions with additional dependency on transverse size or transverse momentum.Inside them, there is existence of anti-quarks, originated from the splitting of gluous, the strong force carrier. Utilizing the Drell-Yan process, NuSea/E866 experiment identified a large asymmetry of anti-d and anti-u asymmetry over the range of x=0.02-0.35, with an intriguing signal of a turning over at large x. Nevertheless, this turning-over trend is puzzling since it is not compatible with the pion-cloud picture which accounts for the observed large antiquark asymmetry. Starting from 2008, a joint Taiwan team formed by Academia Sinica and NKNU groups, worked on Fermilab SeaQuest/E906 experiment whose measuring capability was on the large-x region. The results of large-x antiquark asymmetry are published in Nature 590, 561 (2021) https://www.nature.com/articles/s41586-021-03282-z, along with a commentary at https://www.nature.com/articles/d41586-021-00430-3. Our accurate results clearly show that these distributions of antiquarks are considerably different, with more abundant anti-d than anti-u over a wide range of x, up to 0.45. The measurements are important for studies at the Large Hadron Collider at CERN in establishing the standard model baseline for the search of new physics. The Academia Sinica group make significant contributions to these results, especially on the aspects of data analysis and construction of all digital-signal collection modules.


  • [2]     西元年：2018
    研究人員(中)：章文箴、郡英輝、許軒豪
    研究人員(英)：CHANG, WEN-CHEN, Hideki Kohri，Shiuan-Hal Shiu
    研究成果名稱(中)：Δ^(++) 共振態的光致生成過程的精準量測
    研究成果名稱(英)：High precision information of photo-production of Δ^(++) Resonances
    簡要記述(中)：透過質子靶的 Δ^(++) 共振態的光致生成過程(γp→π^- Δ^(++))，能研究uu ̅夸克對的激發機制。反應截面和束流極化方向不對稱性的資料，將有助確認新型核子共振態和低能量強子反應的研究。利用日本SPring-8設施產生1.5-2.95 GeV背向康普頓散射的高極化線性光子，2018年5月18日， LEPS實驗組在Physics Review Letters (PRL 120, 202004 (2018)). 發表在前置方向和低能量區間的量測結果。
    量測結果發現反應截面高度集中在前置方向，並透過束流極化方向不對稱性的資料確認，是符合π介子t通道交換的機制。束流極化方向不對稱性為負號，這與對應dd ̅ 和 ss ̅ 夸克對生成的π^+ 和 K^+ 光致生成過程的所量測性質相反，相類似的結果也有趣地出現在 pp 和 ep 反應生成π^- 、 π^+ 和 K^+的橫向自旋不對稱性，其中的關連性還有需進一步的探討。這項精準的資料將可提供理論上描述低能量區間強子作用模式，和新型核子共振態的確認。
    簡要記述(英)：The photo-production of Δ^(++) resonances from the proton target (γp→π^- Δ^(++)) is an interesting channel of studying the uu ̅ pair excitation. The production cross sections and beam asymmetries of this process also offers important information in gauging new nucleon resonances and understanding the low-energy hadronic interactions. Such data at the forward production direction and in low-energy regime becomes available recently from the LEPS experiment, using unique 1.5-2.95 GeV linearly-polarized Compton-backward scattered photon beam at SPring-8 facility, Japan. The results are published in Physics Review Letters (PRL 120, 202004 (2018)) on May 18, 2018.
    Strong forward-peaking production from the t-channel π-exchange is confirmed in the high precision data of differential cross sections and beam asymmetries. The measured negative beam asymmetries are opposite to those from π^+ and K^+ photo-production, corresponding to the production of dd ̅ and ss ̅ pairs. It is intriguing that analogous results are observed in the measurements of the transverse single-spin asymmetries in the pp and ep reactions. Further investigations are needed to clarify any fundamental connection. These precise data will surely improve the theoretical modeling of the low-energy hadronic interactions as well as the identification of new nucleon resonances.


  • [3]     西元年：2017
    研究人員(中)：章文箴、朱明禮、謝佳諭、連昱翔、林志勳、澤田廣崇、鄧宇勝
    研究人員(英)：CHANG, WEN-CHEN, Ming-Lee Chu, Chia-Yu Hsieh, Yu-Shiang Lian, Chih-Hsun Lin, Takahiro Sawada and Yu-Sheng Teng
    研究成果名稱(中)：測定質子Sivers函數在極化Drell-Yan過程發生變號
    研究成果名稱(英)：Observation of sign change in Drell-Yan Sivers function
    簡要記述(中)：對於質子內部夸克組成的瞭解，已經由一維縱向動量分布，加入了橫向空間或橫向動量的資訊，進入了細緻的多維分布描述。其中，Sivers 函數是描述整體質子橫向自旋，與其內部夸克橫向動量的關連性，它會反映出夸克的橫向軌道運動效果，我們已經在SIDIS過程中發現Sivers 函數的強度是不為零，這也意味著夸克的橫向軌道運動的存在。透過量子色動力學（QCD）對於強作用力的描述，因為強作用力在SIDIS和Drell-Yan這兩個過程的時間方向是相反的，據此做出一個重要的預測：透過這二反應所得到的Sivers 函數的符號將是相反的。為了檢證這個預測，在2015年CERN COMPASS實驗組進行了首次橫向極化Drell-Yan過程的量測，實驗的結果的確與QCD的預測是相符的，為整體質子夸克橫向動量動量分布研究的正確性提供了極重要的實驗證據。
    簡要記述(英)：Our understanding of the partonic structures of protons has been deepened from the one-dimension longitudinal momentum distributions to multi-dimensional distributions with additional dependency on transverse size or transverse momentum. Among the transverse momentum dependent parton distributions (TMDs), Sivers function describes the correlation between the transverse spin of the parent proton and the transverse momentum of the probed quark. A nonzero Sivers function is considered to be the strong evidence of quark orbital motion. The effects of a nonzero Sivers function have been observed in the semi-inclusive deep inelastic scattering (SIDIS) process. A fundamental prediction based on the factorization of Quantum Chromodynamics (QCD) is a sign change of Sivers functions between SIDIS and Drell-Yan processes due to their opposite time directions of the strong interaction involved. This milestone test has been recently accomplished by the COMPASS collaboration in 2015 transversely-polarized Drell-Yan run. The observed sign of Sivers functions is found to be consistent with the prediction of QCD. This work provides the essential experimental validation of the overall study of TMD partonic structures of protons.
    主要相關著作：
    M. Aghasyan et al. COMPASS Collaboration, 2017, “First Measurement of Transverse-Spin-Dependent Azimuthal Asymmetries in the Drell-Yan Process”, Physical Review Letters, 119(11), 112002. (SCIE) (IF: 9.185; SCI ranking: 9.3%)


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