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Proceedings of the 24th International Spin Symposium (SPIN2021)最新文献

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Accessing Polarized Fragmentation Functions at the Unpolarized EIC and BELLE Experiments 在非极化EIC和BELLE实验中获取极化碎片函数
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-02-14 DOI: 10.7566/JPSCP.37.020116
Shu-yi Wei
{"title":"Accessing Polarized Fragmentation Functions at the Unpolarized EIC and BELLE Experiments","authors":"Shu-yi Wei","doi":"10.7566/JPSCP.37.020116","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020116","url":null,"abstract":"We briefly report our recent progress on the study of the polarized fragmentation functions of Λ hyperon in unpolarized semi-inclusive deep-inelastic scatterings and electron-positron annihilations at low energies. In particular, we present a simple but practical method on how to measure the azimuthal-angle-dependent longitudinal polarization and the transverse polarization inside the production plane and bridge these observables to the corresponding structure functions and fragmentation functions at the leading twist. Our work diversifies the high energy reactions that can probe the polarized fragmentation functions.","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124617884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nucleon Isovector Tensor Charge from Lattice QCD with Physical Light Quarks 物理轻夸克晶格QCD中的核子等矢量张量电荷
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-27 DOI: 10.7566/JPSCP.37.020202
Ryutaro Tsuji, Y. Aoki, K. Ishikawa, Y. Kuramashi, S. Sasaki, E. Shintani, T. Yamazaki
{"title":"Nucleon Isovector Tensor Charge from Lattice QCD with Physical Light Quarks","authors":"Ryutaro Tsuji, Y. Aoki, K. Ishikawa, Y. Kuramashi, S. Sasaki, E. Shintani, T. Yamazaki","doi":"10.7566/JPSCP.37.020202","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020202","url":null,"abstract":",","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124149945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Towards Leading-twist T-odd TMD Gluon Distributions 前导扭转t奇TMD胶子分布的研究
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-25 DOI: 10.7566/JPSCP.37.020124
A. Bacchetta, F. Celiberto, M. Radici
{"title":"Towards Leading-twist T-odd TMD Gluon Distributions","authors":"A. Bacchetta, F. Celiberto, M. Radici","doi":"10.7566/JPSCP.37.020124","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020124","url":null,"abstract":"We present exploratory studies of the 3D proton tomography through polarized $T$-odd gluon TMDs at leading twist, obtained in a spectator-model framework. We embody in our approach a flexible parameterization for the spectator-mass spectral function, suited to catch both small- and moderate-$x$ effects. All these studies are relevant to unveil the gluon dynamics inside hadrons, which represents a core research line of studies at new-generation colliders, such as the Electron-Ion Collider, NICA-SPD, the High-Luminosity LHC, and the Forward Physics Facility.","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129680705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Measurement of Longitudinal Spin Transfer of the (Lambda (bar{Lambda })) Hyperon in Polarized p+p Collisions at (sqrt{s} = 200) GeV at RHIC-STAR rhch - star上(sqrt{s} = 200) GeV极化p+p碰撞中(Lambda (bar{Lambda }))超子纵向自旋转移的测量
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-23 DOI: 10.7566/jpscp.37.020303
Yi-Xiang Yu
{"title":"Measurement of Longitudinal Spin Transfer of the (Lambda (bar{Lambda })) Hyperon in Polarized p+p Collisions at (sqrt{s} = 200) GeV at RHIC-STAR","authors":"Yi-Xiang Yu","doi":"10.7566/jpscp.37.020303","DOIUrl":"https://doi.org/10.7566/jpscp.37.020303","url":null,"abstract":"Since the first surprising results on the spin structure of the proton by the EMC experiment in the late 1980s, much progress has been made in understanding the origin of the proton spin. However, the sea quark contribution to the proton spin, for example, the helicity distributions of the strange quark (anti-quark), $s(bar{s})$, is still not well constrained by experimental data. Since the $s(bar{s})$ is expected to carry a substantial fraction of the spin of the $Lambda(bar{Lambda})$ hyperon, measurements of the longitudinal spin transfer, $D_{LL}$, of the $Lambda(bar{Lambda}$) hyperon can thus shed light on the helicity distribution of the $s(bar{s})$ and the longitudinally polarized fragmentation functions. In these proceedings, we will present the status of the $Lambda(bar{Lambda}$) $D_{LL}$ analysis using data collected at RHIC-STAR in 2015, for the pseudo-rapidity $|eta|<1.2$ and transverse momenta up to $8.0$ GeV$/c$. The $D_{LL}$ as a function of the longitudinal momentum fraction of the $Lambda(bar{Lambda})$ hyperon in the jet is also investigated. This data set is about twice as large as the 2009 data used for the previously published $D_{LL}$ results.","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126532664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transverse Spin Transfer of (Lambda ) and (bar{Lambda }) Hyperons in Polarized p+p Collisions at (sqrt{s} = 200) GeV at RHIC-STAR (sqrt{s} = 200) GeV偏振p+p碰撞中(Lambda )和(bar{Lambda })超子的横向自旋转移
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-21 DOI: 10.7566/JPSCP.37.020117
Yi-Fei Xu
{"title":"Transverse Spin Transfer of (Lambda ) and (bar{Lambda }) Hyperons in Polarized p+p Collisions at (sqrt{s} = 200) GeV at RHIC-STAR","authors":"Yi-Fei Xu","doi":"10.7566/JPSCP.37.020117","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020117","url":null,"abstract":"The transverse spin transfer, D TT , of Λ and Λ hyperons in p + p collisions is expected to be sensitive to the s and ¯ s quark transversity distributions in the proton and to the transversely polarized fragmentation functions. The STAR experiment has published the first measurement of the transverse spin transfer of Λ and Λ hyperons in transversely polarized p + p collisions at √ s = 200 GeV within pseudo-rapidity | η | < 1 . 2 and for the transverse momenta up to 8 GeV / c based on the data taken in 2012. In 2015, a data sample of p + p collisions at √ s = 200 GeV, about two times larger than the 2012 data, was collected. This contribution presents the preliminary results of the transverse spin transfer, D TT , of Λ and Λ hyperon versus transverse momentum and fractional momentum of the hyperon within a jet, based on 2015 data.","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133424239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Useful Relations and Sum Rules for PDFs and Multiparton Distribution Functions of Spin-1 Hadrons 自旋-1强子的pdf和多部分布函数的有用关系和和规则
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-17 DOI: 10.7566/JPSCP.37.020308
S. Kumano, Qin-Tao Song
{"title":"Useful Relations and Sum Rules for PDFs and Multiparton Distribution Functions of Spin-1 Hadrons","authors":"S. Kumano, Qin-Tao Song","doi":"10.7566/JPSCP.37.020308","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020308","url":null,"abstract":",","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114453787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
muEDM: Towards a Search for the Muon Electric Dipole Moment at PSI Using the Frozen-spin Technique muEDM:利用冷冻自旋技术在PSI下寻找μ子电偶极矩
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-17 DOI: 10.7566/JPSCP.37.020604
M. Sakurai, A. Adelmann, M. Backhaus, N. Berger, M. Daum, K. Khaw, K. Kirch, A. Knecht, A. Papa, C. Petitjean, P. Schmidt-Wellenburg
{"title":"muEDM: Towards a Search for the Muon Electric Dipole Moment at PSI Using the Frozen-spin Technique","authors":"M. Sakurai, A. Adelmann, M. Backhaus, N. Berger, M. Daum, K. Khaw, K. Kirch, A. Knecht, A. Papa, C. Petitjean, P. Schmidt-Wellenburg","doi":"10.7566/JPSCP.37.020604","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020604","url":null,"abstract":",","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"278 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132980576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Longitudinal Spin Transfer to (Lambda ) Hyperons in CLAS12 CLAS12中(Lambda )超子的纵向自旋转移
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-17 DOI: 10.7566/JPSCP.37.020304
M. McEneaney
{"title":"Longitudinal Spin Transfer to (Lambda ) Hyperons in CLAS12","authors":"M. McEneaney","doi":"10.7566/JPSCP.37.020304","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020304","url":null,"abstract":"Using the self-analyzing decay of the $Lambda$, the longitudinal spin transfer $D_{LL'}$ to the hyperon from a polarized electron beam scattering off an unpolarized proton target can be determined. For $Lambda$s produced in the current fragmentation region, this quantity is proportional to the helicity dependent fragmentation function $G_1^Lambda$ and can provide insight into the spin structure of the $Lambda$. Currently, limited experimental data on $D_{LL'}$ cannot discriminate between different models of $Lambda$ spin structure. This contribution reports on the status of the ongoing analysis of the longitudinal spin transfer using data taken by the CLAS12 spectrometer at Jefferson Lab with a 10.6 GeV polarized electron beam. We also report on the novel use of Graph Neural Networks (GNNs) to identify signal events.","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129417360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation of the Polarized Quark Fragmentation with Vector Meson Production 具有矢量介子产生的极化夸克碎片的模拟
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-15 DOI: 10.7566/JPSCP.37.020102
A. Kerbizi, X. Artru, Anna Martin
{"title":"Simulation of the Polarized Quark Fragmentation with Vector Meson Production","authors":"A. Kerbizi, X. Artru, Anna Martin","doi":"10.7566/JPSCP.37.020102","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020102","url":null,"abstract":"The recently developed quantum mechanical string + 3 P 0 model of polarized quark fragmentation with pseudoscalar and vector meson production has been implemented in a stand alone Monte Carlo program. The simulation enables the detailed study of the quark spin dependent e ff ects in the fragmentation process such as the transverse spin asymmetries. In particular, it allows to investigate the e ff ects of the production and decay of vector mesons on the Collins and dihadron asymmetries of the observed hadrons, and to study the still unknown Collins e ff ect for vector mesons. The main results of the Monte Carlo simulations obtained so far are summarized and the comparison with the existing experimental data on SIDIS and e + e − annihilation to hadrons processes are presented.","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114638915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Beam Spin Asymmetries of (pi ^{ + }pi ^{0}) Dihadrons from SIDIS at CLAS12 来自SIDIS的(pi ^{ + }pi ^{0})双强子束自旋不对称性
Proceedings of the 24th International Spin Symposium (SPIN2021) Pub Date : 2022-01-15 DOI: 10.7566/JPSCP.37.020109
C. Dilks
{"title":"Beam Spin Asymmetries of (pi ^{ + }pi ^{0}) Dihadrons from SIDIS at CLAS12","authors":"C. Dilks","doi":"10.7566/JPSCP.37.020109","DOIUrl":"https://doi.org/10.7566/JPSCP.37.020109","url":null,"abstract":"Spin asymmetries provide a wide range of insights into nucleon structure and hadronization. Recent measurements of beam spin asymmetries of π + π − dihadrons from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at CLAS12 provide the first empirical evidence of a nonzero G ⊥ 1 , the parton helicity-dependent Dihadron Fragmentation Function (DiFF) encoding spin-momentum correlations in hadronization. These measurements have been extended to aid in the characterization of H ⊥ 1 and H ∢ 1 , the DiFFs dependent on parton transverse spin, via a multidimensional partial wave analysis, giving access to the dependence on the interference of dihadrons of particular polarizations. Reconstruction of π 0 s allows for further extension of these measurements to π + π 0 and π − π 0 dihadrons. The DiFFs describing π + π − production differ from those describing π + π 0 and π − π 0 production, which involve different quark flavors along with a strong suppression of the exclusive diffractive contribution. This presentation will focus on beam spin asymmetries for π + π 0 dihadrons, compared to those from π + π − dihadrons, which will help shed light on a more comprehensive picture of dihadron fragmentation.","PeriodicalId":134433,"journal":{"name":"Proceedings of the 24th International Spin Symposium (SPIN2021)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114332720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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