Related papers: X(16.7) Production in Electron-Position Collision

Exploring Bosonic Mediator of Interaction at BESIII

We present a comprehensive investigation on the possibility of the search for new force mediator $X$ boson in $e^+e^-$ collision and $J/\psi$ decay at the BESIII experiment. The typical interactions of $X$ boson coupling to leptons and…

High Energy Physics - Phenomenology · Physics 2019-06-05 Jun Jiang , Hao Yang , Cong-Feng Qiao

First study of reaction $\Xi^{0}n\rightarrow\Xi^{-}p$ using $\Xi^0$-nucleus scattering at an electron-positron collider

Using $(1.0087\pm0.0044)\times10^{10}$ $J/\psi$ events collected with the BESIII detector at the BEPCII storage ring, the process $\Xi^{0}n\rightarrow\Xi^{-}p$ is studied, where the $\Xi^0$ baryon is produced in the process…

High Energy Physics - Experiment · Physics 2023-07-05 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. Berlowski , 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 , X. X. 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 , J. L. 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. , T. T. Han , W. Y. Han , X. Q. Hao , F. A. Harris , K. K. He , K. L. He , F. H. 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. K. 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. J. Liu , B. X. 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 , Y. M. 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 , P. 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Hunting down the X17 boson at the CERN SPS

Recently, the ATOMKI experiment has reported new evidence for the excess of $e^+ e^-$ events with a mass $\sim$17 MeV in the nuclear transitions of $^4$He, that they previously observed in measurements with $^8$Be. These observations could…

High Energy Physics - Experiment · Physics 2020-09-09 E. Depero , Yu. M. Andreev , D. Banerjee , J. Bernhard , V. Burtsev , A . Chumakov , D. Cooke , A. Dermenev , S. Donskov , R. Dusaev , T. Enik , N. Charitonidis , A. Feshchenko , V. Frolov , A. Gardikiotis , S. Gerassimov , S. Girod , S. Gninenko , M. Hosgen , V. Kachanov , A. Karneyeu , G. Kekelidze , B. Ketzer , D. Kirpichnikov , M. Kirsanov , V. Kolosov , I. Konorov , S. Kovalenko , V. Kramarenko , L. Kravchuk , N. Krasnikov , S. Kuleshov , V. Lyubovitskij , V. Lysan , V. Matveev , Yu. Mikhailov , L. Molina Bueno , D. Peshekhonov , V. Polyakov , B. Radics , R. Rojas , A. Rubbia , V. Samoylenko , D. Shchukin , H. Sieber , V. Tikhomirov , I. Tlisova , D. Tlisov , A. Toropin , A. Trifonov , B. Vasilishin , G. Vasquez , P. Volkov , V. Volkov , P. Ulloa , P. Crivelli

Improved limits on a hypothetical X(16.7) boson and a dark photon decaying into $e^+e^-$ pairs

The improved results on a direct search for a new X(16.7 MeV) boson which could explain the anomalous excess of $e^+e^-$ pairs observed in the excited 8Be nucleus decays ("Berillium anomaly") are reported. Due to its coupling to electrons,…

High Energy Physics - Experiment · Physics 2020-04-22 D. Banerjee , J. Bernhard , V. E. Burtsev , A. G. Chumakov , D. Cooke , P. Crivelli , E. Depero , A. V. Dermenev , S. V. Donskov , R. R. Dusaev , T. Enik , N. Charitonidis , A. Feshchenko , V. N. Frolov , A. Gardikiotis , S. G. Gerassimov , S. N. Gninenko , M. Hoesgen , M. Jeckel , V. A. Kachanov , A. E. Karneyeu , G. Kekelidze , B. Ketzer , D. V. Kirpichnikov , M. M. Kirsanov , V. N. Kolosov , I. V. Konorov , S. G. Kovalenko , V. A. Kramarenko , L. V. Kravchuk , N. V. Krasnikov , S. V. Kuleshov , V. E. Lyubovitskij , V. Lysan , V. A. Matveev , Yu. V. Mikhailov , L. Molina Bueno , D. V. Peshekhonov , V. A. Polyakov , B. Radics , R. Rojas , A. Rubbia , V. D. Samoylenko , D. Shchukin , V. O. Tikhomirov , I. Tlisova , D. A. Tlisov , A. N. Toropin , A. Yu. Trifonov , B. I. Vasilishin , G. Vasquez Arenas , P. V. Volkov , V. Yu. Volkov , P. Ulloa

Light Axial Vectors, Nuclear Transitions, and the $^8$Be Anomaly

New hidden particles could potentially be emitted and discovered in rare nuclear transitions. In this work we investigate the production of hidden vector bosons with primarily axial couplings to light quarks in nuclear transitions, and we…

High Energy Physics - Phenomenology · Physics 2017-07-06 Jonathan Kozaczuk , David E. Morrissey , S. R. Stroberg

Results from Electron-Positron Collisions at BESIII

A selection of results from electron-positron collisions at BESIII are reviewed. The results presented here illustrate the wide range of physics topics that can be studied using the Beijing Electron Positron Collider~(BEPC). At low…

High Energy Physics - Experiment · Physics 2019-08-13 R. E. Mitchell

Anomaly in decay of 8Be and 4He -- can an observed light boson mediate low energy nucleon-nucleon interactions ?

We present a hypothesis that the anomaly in the folding angle distribution of electron-positron pairs, emitted in the decay of the excited levels of nucleus $^{8}$Be and $^{4}$He can be related to the cluster structure of the decaying…

Nuclear Theory · Physics 2021-06-11 M. Veselsky , V. Petousis , J. Leja

Constraining the axial-vector X17 interpretation with ${}^{12}$C data

Recent findings of an unexpected, narrow resonance in the $e^+e^-$ decay spectra of excited states of $^8$Be, $^4$He and $^{12}$C by the ATOMKI collaboration have received considerable experimental and theoretical attention, whereby a new,…

High Energy Physics - Phenomenology · Physics 2024-06-13 Cornelis J. G. Mommers , Marc Vanderhaeghen

X(16.7) as the Solution of NuTeV Anomaly

A recent experimental study of excited $^{8}\!Be$ decay to its ground state reveals an anomaly in the final states angle distribution. This exceptional result is attributed to a new vector gauge boson X(16.7). We study the significance of…

High Energy Physics - Phenomenology · Physics 2017-04-07 Yi Liang , Long-Bin Chen , Cong-Feng Qiao

Protophobic Fifth Force Interpretation of the Observed Anomaly in $^8$Be Nuclear Transitions

Recently a 6.8$\sigma$ anomaly has been reported in the opening angle and invariant mass distributions of $e^+ e^-$ pairs produced in $^8\text{Be}$ nuclear transitions. The data are explained by a 17 MeV vector gauge boson $X$ that is…

High Energy Physics - Phenomenology · Physics 2016-08-17 Jonathan L. Feng , Bartosz Fornal , Iftah Galon , Susan Gardner , Jordan Smolinsky , Tim M. P. Tait , Philip Tanedo

Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN

We report the first results on a direct search for a new 16.7 MeV boson (X) which could explain the anomalous excess of e+e- pairs observed in the excited Be-8 nucleus decays. Due to its coupling to electrons, the X could be produced in the…

High Energy Physics - Experiment · Physics 2018-06-12 D. Banerjee , V. E. Burtsev , A. G. Chumakov , D. Cooke , P. Crivelli , E. Depero , A. V. Dermenev , S. V. Donskov , R. R. Dusaev , T. Enik , N. Charitonidis , A. Feshchenko , V. N. Frolov , A. Gardikiotis , S. G. Gerassimov , S. N. Gninenko , M. Hosgen , M. Jeckel , A. E. Karneyeu , G. Kekelidze , B. Ketzer , D. V. Kirpichnikov , M. M. Kirsanov , I. V. Konorov , S. G. Kovalenko , V. A. Kramarenko , L. V. Kravchuk , N. V. Krasnikov , S. V. Kuleshov , V. E. Lyubovitskij , V. Lysan , V. A. Matveev , Yu. V. Mikhailov , D. V. Peshekhonov , V. A. Polyakov , B. Radics , R. Rojas , A. Rubbia , V. D. Samoylenko , V. O. Tikhomirov , D. A. Tlisov , A. N. Toropin , A. Yu. Trifonov , B. I. Vasilishin , G. Vasquez Arenas , P. V. Volkov , V. Volkov , P. Ulloa

Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation

The Positron Annihilation into Dark Matter Experiment at the Laboratori Nazionali di Frascati has reported an excess of $e^+e^-$ final-state events from positron annihilation on fixed-target atomic electrons. While the global significance…

High Energy Physics - Phenomenology · Physics 2026-04-15 Fernando Arias-Aragón , Giovanni Grilli di Cortona , Enrico Nardi , Claudio Toni

Realistic model for a fifth force explaining anomaly in ${^8Be^*} \to {^8Be} \;{e^+e^-}$ Decay

A $6.8\,\sigma$ anomaly has been reported in the opening angle and invariant mass distributions of $e^+e^-$ pairs produced in ${^8Be}$ nuclear transitions. It has been shown that a protophobic fifth force mediated by a $17\,\textrm{MeV}$…

High Energy Physics - Phenomenology · Physics 2017-04-26 Pei-Hong Gu , Xiao-Gang He

A Re-evaluation of Evidence for Light Neutral Bosons in Nuclear Emulsions

Electron-positron pair-production data obtained by bombardment of emulsion detectors with either cosmic rays or projectiles with mass between one and 207 and kinetic energies between 18 GeV and 32 TeV have been re-analysed using a…

Nuclear Experiment · Physics 2011-08-10 F. W. N. de Boer , C. A. Fields

U-boson at BESIII

The $O$(MeV) spin-1 U-boson has been proposed to mediate the interaction among electron-positron and $O$(MeV) dark matter, in order to account for the 511 keV $\gamma$-ray observation by SPI/INTEGRAL. In this paper the observability of such…

High Energy Physics - Phenomenology · Physics 2008-11-26 Shou-hua Zhu

Isospin Decomposition of Vector and Axial Two-Body Currents via Polarized Electron--Deuteron and Electron--$^3$He Scattering at the Electron-Ion Collider

Two-particle two-hole (2p2h) excitations driven by meson-exchange currents (MEC) are among the leading nuclear uncertainties in long-baseline neutrino oscillation experiments. Three models currently implemented in neutrino event generators…

Nuclear Experiment · Physics 2026-04-21 Guang Yang , Praveen Kumar

Study of hyperon-nucleon interactions at BESIII

Hyperon-nucleon interactions are important to understand quantum chromodynamics and so-called "hyperon puzzle" of neutron star, but limited by the availability and short-lifetime of hyperon beams, the progress of relevant research is very…

High Energy Physics - Experiment · Physics 2024-06-25 Jielei Zhang

BSM searches at BESIII

The BESIII experiment is a symmetric e+ e- collider experiment operating at center-of-mass energies from 2.0 to 4.95 GeV. With the world's largest threshold production data set, including 10 billion J/psi events, 2.7 billion psi(3686)…

High Energy Physics - Experiment · Physics 2025-09-23 Zhi Gao

Hunting the elusive $X17$ in CE$\nu$NS at the ESS

The so-called $X17$ particle has been proposed in order to explain a very significant resonant behaviour (in both the angular separation and invariant mass) of $e^+e^-$ pairs produced during a nuclear transition of excited $^8$Be, $^4$He…

High Energy Physics - Phenomenology · Physics 2025-09-19 Joakim Cederkäll , Yaşar Hiçyılmaz , Else Lytken , Stefano Moretti , Johan Rathsman

Ab initio investigation of the $^7$Li($p,e^+e^-$)$^8$Be process and the X17 boson

Observations of anomalies in the electron-positron angular correlations in high-energy decays in $^4$He, $^8$Be, and $^{12}$C have been reported recently by the ATOMKI collaboration. These could be explained by the creation and subsequent…

Nuclear Theory · Physics 2024-07-15 P. Gysbers , P. Navratil , K. Kravvaris , G. Hupin , S. Quaglioni