Related papers: Probing Proton Strangeness with Time-Like Virtual …

Proton Electromagnetic Form Factors in the Time-like Region through the Scan Technique

For over 100 years, scientists have investigated the properties of the proton, which is one of the most abundant components of visible matter in the universe. Nevertheless, researchers do not fully understand many details about its internal…

High Energy Physics - Experiment · Physics 2022-02-01 L. Xia , Ch. Rosner , Y. D. Wang , X. R. Zhou , F. E. Maas , R. Baldini Ferroli , H. M. Hu , G. S. Huang

On the Proton Form Factors in the Time-Like Region

The process $ \bar{p} p \rightarrow e^{-} e^{+} $ is considered in the general case of polarized initial particles. A relation between the difference of the phases of the electromagnetic form factors $G_M$ and $G_E$ in the time-like region…

High Energy Physics - Phenomenology · Physics 2007-05-23 S. M. Bilenky , C. Giunti , V. Wataghin

The VV'P form factors in resonance chiral theory and the pi-eta-eta' light-by-light contribution to the muon g-2

The description of the VV'P form factors (V,V' stands for vector particles and P for a pseudoscalar meson) for different particles virtualities remains a challenge for the theory of strong interactions. While their chiral limit is well…

High Energy Physics - Phenomenology · Physics 2014-04-22 P. Roig , A. Guevara , G. López Castro

Parity-Violating Electron Scattering and the Electric and Magnetic Strange Form Factors of the Nucleon

Measurement of the neutral weak vector form factors of the nucleon provides unique access to the strange quark content of the nucleon. These form factors can be studied using parity-violating electron scattering. A comprehensive program of…

Nuclear Experiment · Physics 2012-10-29 D. S. Armstrong , R. D. McKeown

Proton em form factors data are in disagreement with new $\sigma_{tot}(e^+e^- \to p\bar p)$ measurements

Till now almost 50 different data collections on the proton and neutron electromagnetic form factors, also on their ratios, exist. On the other hand, recently new very precise data on $\sigma_{tot}(e^+e^- \to p \bar p)$ from threshold up to…

High Energy Physics - Phenomenology · Physics 2020-11-02 Anna Zuzana Dubnickova , Stanislav Dubnicka

Measurements of the electric and magnetic form factors of the neutron for time-like momentum transfer

We present the first measurements of the electric and magnetic form factors of the neutron in the time-like (positive $q^2$) region as function of four-momentum transfer. We explored the differential cross sections of the reaction $e^+e^-…

High Energy Physics - Experiment · Physics 2023-03-30 BESIII Collaboration , M. Ablikim , M. N. Achasov , P. Adlarson , R. Aliberti , A. Amoroso , M. R. An , Q. An , Y. Bai , O. Bakina , I. Balossino , Y. Ban , V. Batozskaya , K. Begzsuren , N. Berger , M. Bertani , D. Bettoni , F. Bianchi , E. Bianco , J. Bloms , A. Bortone , I. Boyko , R. A. Briere , A. Brueggemann , H. Cai , X. Cai , A. Calcaterra , G. F. Cao , N. Cao , S. A. Cetin , J. F. Chang , T. T. Chang , W. L. Chang , G. R. Che , G. Chelkov , C. Chen , Chao Chen , G. Chen , H. S. Chen , M. L. Chen , S. J. Chen , S. M. Chen , T. Chen , X. R. Chen , X. T. Chen , Y. B. Chen , Y. Q. Chen , Z. J. Chen , W. S. Cheng , S. K. Choi , X. Chu , G. Cibinetto , S. C. Coen , F. Cossio , J. J. Cui , H. L. Dai , J. P. Dai , A. Dbeyssi , R. E. de Boer , D. Dedovich , Z. Y. Deng , A. Denig , I. Denysenko , M. Destefanis , F. De Mori , B. Ding , Y. Ding , Y. Ding , J. Dong , L. Y. Dong , M. Y. Dong , X. Dong , S. X. Du , Z. H. Duan , P. Egorov , Y. L. Fan , J. Fang , S. S. Fang , W. X. Fang , Y. Fang , R. Farinelli , L. Fava , F. Feldbauer , G. Felici , C. Q. Feng , J. H. Feng , K Fischer , M. Fritsch , C. Fritzsch , C. D. Fu , Y. W. Fu , H. Gao , Y. N. Gao , Yang Gao , S. Garbolino , I. Garzia , P. T. Ge , Z. W. Ge , C. Geng , E. M. Gersabeck , A Gilman , K. Goetzen , L. Gong , W. X. Gong , W. Gradl , S. Gramigna , M. Greco , M. H. Gu , Y. T. Gu , C. Y Guan , Z. L. Guan , A. Q. Guo , L. B. Guo , R. P. Guo , Y. P. Guo , A. Guskov , X. T. H. , W. Y. Han , X. Q. Hao , F. A. Harris , K. K. He , K. L. He , F. H. Heinsius , C. H. Heinz , Y. K. Heng , C. Herold , T. Holtmann , P. C. Hong , G. Y. Hou , Y. R. Hou , Z. L. Hou , H. M. Hu , J. F. Hu , T. Hu , Y. Hu , G. S. Huang , K. X. Huang , L. Q. Huang , X. T. Huang , Y. P. Huang , T. Hussain , N Hüsken , W. Imoehl , M. Irshad , J. Jackson , S. Jaeger , S. Janchiv , J. H. Jeong , Q. Ji , Q. P. Ji , X. B. Ji , X. L. Ji , Y. Y. Ji , Z. K. Jia , P. C. Jiang , S. S. Jiang , T. J. Jiang , X. S. Jiang , Y. Jiang , J. B. Jiao , Z. Jiao , S. Jin , Y. Jin , M. Q. Jing , T. Johansson , X. K. , S. Kabana , N. Kalantar-Nayestanaki , X. L. Kang , X. S. Kang , R. Kappert , M. Kavatsyuk , B. C. Ke , A. Khoukaz , R. Kiuchi , R. Kliemt , L. Koch , O. B. Kolcu , B. Kopf , M. Kuessner , A. Kupsc , W. Kühn , J. J. Lane , J. S. Lange , P. Larin , A. Lavania , L. Lavezzi , T. T. Lei , Z. H. Lei , H. Leithoff , M. Lellmann , T. Lenz , C. Li , C. Li , C. H. Li , Cheng Li , D. M. Li , F. Li , G. Li , H. Li , H. B. Li , H. J. Li , H. N. Li , Hui Li , J. R. Li , J. S. Li , J. W. Li , Ke Li , L. J Li , L. K. Li , Lei Li , M. H. Li , P. R. Li , S. X. Li , T. Li , W. D. Li , W. G. Li , X. H. Li , X. L. Li , Xiaoyu Li , Y. G. Li , Z. J. Li , Z. X. Li , Z. Y. Li , C. Liang , H. Liang , H. Liang , H. Liang , Y. F. Liang , Y. T. Liang , G. R. Liao , L. Z. Liao , J. Libby , A. Limphirat , D. X. Lin , T. Lin , B. X. Liu , B. J. Liu , C. Liu , C. X. Liu , D. Liu , F. H. Liu , Fang Liu , Feng Liu , G. M. Liu , H. Liu , H. B. Liu , H. M. Liu , Huanhuan Liu , Huihui Liu , J. B. Liu , J. L. Liu , J. Y. Liu , K. Liu , K. Y. Liu , Ke Liu , L. Liu , L. C. Liu , Lu Liu , M. H. Liu , P. L. Liu , Q. Liu , S. B. Liu , T. Liu , W. K. Liu , W. M. Liu , X. Liu , Y. Liu , Y. B. Liu , Z. A. Liu , Z. Q. Liu , X. C. Lou , F. X. Lu , H. J. Lu , J. G. Lu , X. L. Lu , Y. Lu , Y. P. Lu , Z. H. Lu , C. L. Luo , M. X. Luo , T. Luo , X. L. Luo , X. R. Lyu , Y. F. Lyu , F. C. Ma , H. L. Ma , J. L. Ma , L. L. Ma , M. M. Ma , Q. M. Ma , R. Q. Ma , R. T. Ma , X. Y. Ma , Y. Ma , F. E. Maas , M. Maggiora , S. Maldaner , S. Malde , A. Mangoni , Y. J. Mao , Z. P. Mao , S. Marcello , Z. X. Meng , J. G. Messchendorp , G. Mezzadri , H. Miao , T. J. Min , R. E. Mitchell , X. H. Mo , N. Yu. Muchnoi , Y. Nefedov , F. Nerling , I. B. Nikolaev , Z. Ning , S. Nisar , Y. Niu , S. L. Olsen , Q. Ouyang , S. Pacetti , X. Pan , Y. Pan , A. Pathak , Y. P. Pei , M. Pelizaeus , H. P. Peng , K. 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L. Yang , H. X. Yang , Tao Yang , Y. Yang , Y. F. Yang , Y. X. Yang , Yifan Yang , M. Ye , M. H. Ye , J. H. Yin , Z. Y. You , B. X. Yu , C. X. Yu , G. Yu , T. Yu , X. D. Yu , C. Z. Yuan , L. Yuan , S. C. Yuan , X. Q. Yuan , Y. Yuan , Z. Y. Yuan , C. X. Yue , A. A. Zafar , F. R. Zeng , X. Zeng , Y. Zeng , Y. J. Zeng , X. Y. Zhai , Y. H. Zhan , A. Q. Zhang , B. L. Zhang , B. X. Zhang , D. H. Zhang , G. Y. Zhang , H. Zhang , H. H. Zhang , H. H. Zhang , H. Q. Zhang , H. Y. Zhang , J. J. Zhang , J. L. Zhang , J. Q. Zhang , J. W. Zhang , J. X. Zhang , J. Y. Zhang , J. Z. Zhang , Jiawei Zhang , L. M. Zhang , L. Q. Zhang , Lei Zhang , P. Zhang , Q. Y. Zhang , Shuihan Zhang , Shulei Zhang , X. D. Zhang , X. M. Zhang , X. Y. Zhang , X. Y. Zhang , Y. Zhang , Y. T. Zhang , Y. H. Zhang , Yan Zhang , Yao Zhang , Z. H. Zhang , Z. L. Zhang , Z. Y. Zhang , Z. Y. Zhang , G. Zhao , J. Zhao , J. Y. Zhao , J. Z. Zhao , Lei Zhao , Ling Zhao , M. G. Zhao , S. J. Zhao , Y. B. Zhao , Y. X. Zhao , Z. G. Zhao , A. Zhemchugov , B. Zheng , J. P. Zheng , W. J. Zheng , Y. H. Zheng , B. Zhong , X. Zhong , H. Zhou , L. P. Zhou , X. Zhou , X. R. Zhou , X. Y. Zhou , Y. Z. Zhou , J. Zhu , K. Zhu , K. J. Zhu , L. Zhu , L. X. Zhu , S. H. Zhu , S. Q. Zhu , T. J. Zhu , W. J. Zhu , Y. C. Zhu , Z. A. Zhu , J. H. Zou , J. Zu

How strange is pion electroproduction?

We consider pion production in parity-violating electron scattering (PVES) in the presence of nucleon strangeness in the framework of partial wave analysis with unitarity. Using the experimental bounds on the strange form factors obtained…

Nuclear Theory · Physics 2015-11-25 Mikhail Gorchtein , Hubert Spiesberger , Xilin Zhang

Strange nucleon form factors: Solitonic approach to $G_{M}^{s}$, $G_{E}^{s}$, $\tilde{G}_{A}^{p}$ and $\tilde{G}_{A}^{n}$ and comparison with world data

We summarize the results of the chiral quark-soliton model ($\chi$QSM) concerning basically all form factors necessary to interpret the present data of the parity violating electron scattering experiments SAMPLE, HAPPEX, A4 and G0. The…

High Energy Physics - Phenomenology · Physics 2008-11-26 Klaus Goeke , Hyun-Chul Kim , Antonio Silva , Diana Urbano

Strange chiral nucleon form factors

We investigate the strange electric and magnetic form factors of the nucleon in the framework of heavy baryon chiral perturbation theory to third order in the chiral expansion. All counterterms can be fixed from data. In particular, the two…

Nuclear Theory · Physics 2009-10-31 Thomas R. Hemmert , Bastian Kubis , Ulf-G. Meißner

Strangeness contributions to nucleon form factors

We review a recent theoretical determination of the strange quark content of the electromagnetic form factors of the nucleon. These are compared with a global analysis of current experimental measurements in parity-violating electron…

Nuclear Theory · Physics 2008-11-26 Ross D. Young

New Precision Limit on the Strange Vector Form Factors of the Proton

The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV and beam energy E =3.48 GeV to be A_PV = -23.80 +/-…

Nuclear Experiment · Physics 2015-05-28 HAPPEX collaboration , Z. Ahmed , K. Allada , K. A. Aniol , D. S. Armstrong , J. Arrington , P. Baturin , V. Bellini , J. Benesch , R. Beminiwattha , F. Benmokhtar , M. Canan , A. Camsonne , G. D. Cates , J. -P. Chen , E. Chudakov , E. Cisbani , M. M. Dalton , C. W. de Jager , R. De Leo , W. Deconinck , P. Decowski , X. Deng , A. Deur , C. Dutta , G. B. Franklin , M. Friend , S. Frullani , F. Garibaldi , A. Giusa , A. Glamazdin , S. Golge , K. Grimm , O. Hansen , D. W. Higinbotham , R. Holmes , T. Holmstrom , J. Huang , M. Huang , C. E. Hyde , C. M. Jen , G. Jin , D. Jones , H. Kang , P. King , S. Kowalski , K. S. Kumar , J. H. Lee , J. J. LeRose , N. Liyanage , E. Long , D. McNulty , D. Margaziotis , F. Meddi , D. G. Meekins , L. Mercado , Z. -E. Meziani , R. Michaels , C. Munoz-Camacho , M. Mihovilovic , N. Muangma , K. E. Myers , S. Nanda , A. Narayan , V. Nelyubin , Nuruzzaman , Y. Oh , K. Pan , D. Parno , K. D. Paschke , S. K. Phillips , X. Qian , Y. Qiang , B. Quinn , A. Rakhman , P. E. Reimer , K. Rider , S. Riordan , J. Roche , J. Rubin , G. Russo , K. Saenboonruang , A. Saha , B. Sawatzky , R. Silwal , S. Sirca , P. A. Souder , M. Sperduto , R. Subedi , R. Suleiman , V. Sulkosky , C. M. Sutera , W. A. Tobias , G. M. Urciuoli , B. Waidyawansa , D. Wang , J. Wexler , R. Wilson , B. Wojtsekhowski , X. Zhan , X. Yan , H. Yao , L. Ye , B. Zhao , X. Zheng

Strange form factors of the nucleon

The strangeness content of nucleon form factors is analyzed in a two-component model with a quark-like intrinsic structure surrounded by a meson cloud. A comparison with the available experimental data from the SAMPLE, PVA4, HAPPEX and G0…

Nuclear Theory · Physics 2008-11-26 R. Bijker

$\phi$-meson lepto-production near threshold and the strangeness $D$-term

We present a model of exclusive $\phi$-meson lepto-production $ep \to e'p'\phi$ near threshold which features the strangeness gravitational form factors of the proton. We argue that the shape of the differential cross section $d\sigma/dt$…

High Energy Physics - Phenomenology · Physics 2021-05-19 Yoshitaka Hatta , Mark Strikman

The form factors for the photon to pseudoscalar meson transitions - an update

The form factors for the transitions pi-photon, eta-photon, eta'-photon and etac-photon are analyzed within the modified perturbative approach in which quark transverse degrees of freedom are retained. The results for the form factors are…

High Energy Physics - Phenomenology · Physics 2025-01-09 P. Kroll

New insights into the nucleon's electromagnetic structure

We present a combined analysis of the electromagnetic form factors of the nucleon in the space- and timelike regions using dispersion theory. Our framework provides a consistent description of the experimental data over the full range of…

High Energy Physics - Phenomenology · Physics 2022-02-16 Yong-Hui Lin , Hans-Werner Hammer , Ulf-G. Meißner

Influence of confining gluon configurations on the $P\to\gamma^*\gamma $ transition form factors

Transition form factors $F_{P\gamma^*\gamma^{(*)}}$ of pseudoscalar mesons are studied within the framework of the domain model of confinement, chiral symmetry breaking and hadronization. In this model, the QCD vacuum is described by the…

High Energy Physics - Phenomenology · Physics 2017-05-03 Sergei N. Nedelko , Vladimir E. Voronin

Testing the consistency of the $\omega\pi$ transition form factor with unitarity and analyticity

We perform a dispersive analysis of the $\omega\pi$ electromagnetic transition form factor, using as input the discontinuity provided by unitarity below the $\omega\pi$ threshold and including for the first time experimental data on the…

High Energy Physics - Phenomenology · Physics 2015-05-21 I. Caprini

Measurement of the Generalized Polarizabilities of the Proton at Intermediate $Q^2$

Background: Generalized polarizabilities (GPs) are important observables to describe the nucleon structure, and measurements of these observables are still scarce. Purpose: This paper presents details of a virtual Compton scattering (VCS)…

Nuclear Experiment · Physics 2021-03-03 H. Fonvieille , J. Beričič , L. Correa , M. Benali , P. Achenbach , C. Ayerbe Gayoso , J. C. Bernauer , A. Blomberg , R. Böhm , D. Bosnar , L. Debenjak , A. Denig , M. O. Distler , E. J. Downie , A. Esser , I. Friščić , S. Kegel , Y. Kohl , M. Makek , H. Merkel , D. G. Middleton , M. Mihovilovič , U. Müller , L. Nungesser , M. Paolone , J. Pochodzalla , S. Sánchez Majos , B. S. Schlimme , M. Schoth , F. Schulz , C. Sfienti , S. Širca , N. Sparveris , S. Štajner , M. Thiel , A. Tyukin , A. Weber , M. Weinriefer

Meson-Photon Transition Form Factors

We present the results of our recent analysis of the meson-photon transition form factors $F_{P\gamma}(Q^2)$ for the pseudoscalar mesons $P = \pi^0,\eta,\eta',\eta_c$, using the local-duality version of QCD sum rules.

High Energy Physics - Phenomenology · Physics 2015-06-11 Irina Balakireva , Wolfgang Lucha , Dmitri Melikhov

Strangeness Vector and Axial-Vector Form Factors of the Nucleon

A revised global fit of electroweak $ep$ and $\nu p$ elastic scattering data has been performed, with the goal of determining the strange quark contribution to the vector and axial-vector form factors of the nucleon in the momentum-transfer…

High Energy Physics - Phenomenology · Physics 2014-11-18 Stephen Pate , Dennis Trujillo