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Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)最新文献

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Gravitational form factor constraints and their universality 引力形状因子约束及其普适性
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2020-01-07 DOI: 10.22323/1.374.0059
P. Lowdon, S. Cotogno, C. Lorc'e
{"title":"Gravitational form factor constraints and their universality","authors":"P. Lowdon, S. Cotogno, C. Lorc'e","doi":"10.22323/1.374.0059","DOIUrl":"https://doi.org/10.22323/1.374.0059","url":null,"abstract":"By adopting a local QFT framework one can derive in a non-perturbative manner the constraints imposed by Poincar'e symmetry on the form factors appearing in the Lorentz covariant decomposition of the energy-momentum tensor matrix elements. In particular, this approach enables one to prove that these constraints are in fact independent of the internal properties of the states appearing in the matrix elements. Here we outline the rationale behind this approach, and report on some of the implications of these findings.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125166002","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: 2
Double parton distributions of the pion in the NJL model NJL模型中介子的双部子分布
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2020-01-03 DOI: 10.22323/1.374.0031
W. Broniowski, E. Arriola
{"title":"Double parton distributions of the pion in the NJL model","authors":"W. Broniowski, E. Arriola","doi":"10.22323/1.374.0031","DOIUrl":"https://doi.org/10.22323/1.374.0031","url":null,"abstract":"We evaluate the valence double parton distribution (dPDF) of the pion in the Nambu--Jona-Lasinio model. At the low-energy quark-model scale and in the chiral limit a particularly simple factorized form $D(x_1,x_2, vec{q}) = delta(1-x_1-x_2) F(vec{q})$ follows, where $x_{1,2}$ denote the longitudinal momentum fractions of the valence quark and antiquark, and $vec{q}$ is their relative transverse momentum. For $vec{q}=vec{0}$ our result complies to the Gaunt-Sterling sum rules. We carry out the necessary dDGLAP evolution to higher scales via the Mellin moments and explore its impact on the correlation defined as the ratio of dPDF to the product of single parton distributions, $D(x_1,x_2, vec{q}=vec{0})/D(x_1)D(x_2)$. Since the ratios of the valence Mellin moments $langle x_1^n x_2^m rangle / langle x_1^n rangle langle x_2^m rangle $ are invariants of the dDGLAP evolution, they may serve as robust measures of these correlations. Model predictions, which can be tested in the upcoming lattice simulations, are provided. We also discuss the transverse form factor related to the dPDF of the pion.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126609504","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: 6
Structure and EM form factors of purely relativistic systems 纯相对论系统的结构和电磁形式因素
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2020-01-02 DOI: 10.22323/1.374.0050
V. Karmanov, J. Carbonell, H. Sazdjian
{"title":"Structure and EM form factors of purely relativistic systems","authors":"V. Karmanov, J. Carbonell, H. Sazdjian","doi":"10.22323/1.374.0050","DOIUrl":"https://doi.org/10.22323/1.374.0050","url":null,"abstract":"The Bethe-Salpeter equation for two massive scalar particles interacting by scalar massless exchange has solutions of two types, which differ from each other by their behavior in the non-relativistic limit: the normal solutions which turn into the Coulomb ones and the \"abnormal\" solutions. The latter ones have no non-relativistic counterparts and disappear in the non-relativistic limit. We studied the composition of all these states. It turns out that the normal states, even for large binding energy, are dominated by two massive particles. Whereas, the contribution of the two-body sector into the abnormal states, even for small binding energy, is of the order of 1% only; they are dominated by an indefinite number of the massless particles. The elastic electromagnetic form factors for both normal and abnormal states, as well as the transition ones between them, are calculated.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115638871","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: 3
Toward precision jet event shape for future Electron-Ion Collider 未来电子-离子对撞机的精确射流形状研究
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2019-12-23 DOI: 10.22323/1.374.0061
D. Kang, T. Maji
{"title":"Toward precision jet event shape for future Electron-Ion Collider","authors":"D. Kang, T. Maji","doi":"10.22323/1.374.0061","DOIUrl":"https://doi.org/10.22323/1.374.0061","url":null,"abstract":"We present angularity differential cross-section for the deep inelastic scattering process (DIS) in the framework of soft-collinear effective theory (SCET). Using SCET, the cross-section is factorized in terms of hard, jet, beam and soft functions. Our result includes resummation of the large logarithms up to next-to-next leading logarithmic (NNLL) accuracy. The numerical results presented here for DIS angularity cross-section can be explored by the future EIC.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132777640","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: 2
Basic properties of GPDs and modelling of the latter gpd的基本性质及其建模
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2019-12-19 DOI: 10.22323/1.374.0065
C. Mezrag, N. Chouika, H. Moutarde, J. Rodríguez-Quintero
{"title":"Basic properties of GPDs and modelling of the latter","authors":"C. Mezrag, N. Chouika, H. Moutarde, J. Rodríguez-Quintero","doi":"10.22323/1.374.0065","DOIUrl":"https://doi.org/10.22323/1.374.0065","url":null,"abstract":"We present here a new method based on the Radon transform to model Generalised Parton Distributions (GPDs). It allows to fulfil all theoretical constraints applying on GPDs, especially polynomiality and positivity at the same time. More specifically, we show how polynomiality can be systematically restored within the framework of the overlaps of Lightfront Wave Functions (LFWFs). It provides a systematic way to extend models defined solely in the DGLAP kinematical region to the ERBL one. We then exemplify our approach using LFWFs models.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116934251","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
Exclusive production of heavy quarkonia as a probe of the low x and low scale gluon PDF 独家生产的重夸克子作为低x和低尺度胶子PDF的探针
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2019-12-19 DOI: 10.22323/1.374.0040
C. Flett, S. Jones, Alan D. Martin, M. Ryskin, T. Teubner
{"title":"Exclusive production of heavy quarkonia as a probe of the low x and low scale gluon PDF","authors":"C. Flett, S. Jones, Alan D. Martin, M. Ryskin, T. Teubner","doi":"10.22323/1.374.0040","DOIUrl":"https://doi.org/10.22323/1.374.0040","url":null,"abstract":"We discuss the exclusive $J/psi$ photoproduction process, as measured recently at LHCb, as a means of constraining and ultimately determining the low $x$ and low $Q$ gluon PDF. The scale dependence of the theoretical prediction for this process is shown to be systematically improved via a taming of the known $bar{text{MS}}$ result, this amounts to resumming logarithmically enhanced small-$x$ terms and implementing a small-$Q$ power correction. The cross section level predictions allow the behaviour of the gluon PDF in the low $(x, Q)$ domain to be determined.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114710148","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
Towards resonance properties in the Dyson-Schwinger approach Dyson-Schwinger方法中的共振特性
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2019-12-18 DOI: 10.22323/1.374.0003
G. Eichmann
{"title":"Towards resonance properties in the Dyson-Schwinger approach","authors":"G. Eichmann","doi":"10.22323/1.374.0003","DOIUrl":"https://doi.org/10.22323/1.374.0003","url":null,"abstract":"We give a brief summary of the Dyson-Schwinger and Bethe-Salpeter approach to hadron spectroscopy and report on recent progress in determining resonance properties in this framework. We exemplify the extraction of resonances using a scalar model, where we solve the scattering equation for the four-point scattering amplitude and extract the pole locations on the second Riemann sheet as well as the phase shifts.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114303983","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: 1
Nucleon-to-meson transition distribution amplitudes in impact parameter space 撞击参数空间中的核子-介子跃迁分布振幅
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2019-12-11 DOI: 10.22323/1.374.0012
B. Pire, K. Semenov-Tian-Shansky, L. Szymanowski
{"title":"Nucleon-to-meson transition distribution amplitudes in impact parameter space","authors":"B. Pire, K. Semenov-Tian-Shansky, L. Szymanowski","doi":"10.22323/1.374.0012","DOIUrl":"https://doi.org/10.22323/1.374.0012","url":null,"abstract":"Recent analyses of backward meson electroproduction support the validity of a collinear QCD factorization framework for these hard exclusive reactions. This opens a way to the extraction of nucleon-to-meson transition distribution amplitudes (TDAs) from the experimental data. Similarly to the generalized parton distributions, TDAs - after the Fourier transform in the transverse plane - carry valuable information on the transverse location of hadron constituents. We address the properties of integrated nucleon-to-meson TDAs in the impact parameter representation. We argue that the emerging picture provides an intuitive interpretation for the hadron structural information contained in nucleon-to-meson TDAs and allows to study diquark-quark contents of fast moving hadrons in the transverse plane.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127995676","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: 3
Bound states and Perturbation theory 束缚态和微扰理论
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2019-11-17 DOI: 10.22323/1.374.0046
P. Hoyer
{"title":"Bound states and Perturbation theory","authors":"P. Hoyer","doi":"10.22323/1.374.0046","DOIUrl":"https://doi.org/10.22323/1.374.0046","url":null,"abstract":"A perturbative expansion for QED and QCD bound states is formulated in $A^0=0$ gauge. The constituents of each Fock state are bound by their instantaneous interaction. In QCD an O($alpha_s^0$) confining potential arises from a homogeneous solution of Gauss' constraint. The potential is uniquely determined by the QCD action, up to a universal scale. The Cornell potential is reproduced for quarkonia, and corresponding ones found for higher Fock states, baryons and glueballs.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124598114","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
Exclusive diffractive processes including saturation effects at next-to-leading order 独有的衍射过程，包括在次领先的顺序饱和效应
Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019) Pub Date : 2019-09-16 DOI: 10.22323/1.374.0092
R. Boussarie, A. Grabovsky, L. Szymanowski, S. Wallon
{"title":"Exclusive diffractive processes including saturation effects at next-to-leading order","authors":"R. Boussarie, A. Grabovsky, L. Szymanowski, S. Wallon","doi":"10.22323/1.374.0092","DOIUrl":"https://doi.org/10.22323/1.374.0092","url":null,"abstract":"In the framework of the QCD shock-wave approach, we review our results on the description of diffractive production of various final states (jets, meson) at next-to-leading order. This is applied to exclusive diffractive dijet electroproduction at HERA.","PeriodicalId":299412,"journal":{"name":"Proceedings of Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions — PoS(LC2019)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116954861","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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