Related papers: Unveiling atomic electron motion effects in $e^+e^…

Low Mass Dimuon Production in p-A Collisions at $\sqrt{s} = 27.5$ GeV with NA60

The NA60 experiment has studied low-mass muon pair production in proton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targets using a 400 GeV/$c$ proton beam at the CERN SPS. The mass spectrum is well described by the…

High Energy Physics - Experiment · Physics 2015-05-30 Antonio Uras , NA60 Collaboration

Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS

We report on a direct search for sub-GeV dark photons (A') which might be produced in the reaction e^- Z \to e^- Z A' via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS.…

High Energy Physics - Experiment · Physics 2017-01-06 NA64 Collaboration , D. Banerjee , V. Burtsev , D. Cooke , P. Crivelli , E. Depero , A. V. Dermenev , S. V. Donskov , F. Dubinin , R. R. Dusaev , S. Emmenegger , A. Fabich , V. N. Frolov , A. Gardikiotis , S. N. Gninenko , M. Hosgen , V. A. Kachanov , A. E. Karneyeu , B. Ketzer , D. V. Kirpichnikov , M. M. Kirsanov , 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 , V. V. Myalkovskiy , V. D. Peshekhonov , D. V. Peshekhonov , O. Petuhov , V. A. Polyakov , B. Radics , A. Rubbia , V. D. Samoylenko , V. O. Tikhomirov , D. A. Tlisov , A. N. Toropin , A. Yu. Trifonov , B. Vasilishin , G. Vasquez Arenas , P. Ulloa , K. Zhukov , K. Zioutas

Missing energy signatures of inelastic magnetic dipole DM at NA64e

Some extensions of the Standard Model consider inelastic dark matter (iDM) as an attractive candidate for sub-GeV DM of thermal origin that could be detected at modern accelerators. In the present paper, we calculate the production rate of…

High Energy Physics - Phenomenology · Physics 2026-03-31 Sergei N. Gninenko , N. V. Krasnikov , I. V. Voronchikhin , D. V. Kirpichnikov

Search for the Chiral Magnetic Effect in Au+Au collisions at $\sqrt{s_{_{\rm{NN}}}}=27$ GeV with the STAR forward Event Plane Detectors

A decisive experimental test of the Chiral Magnetic Effect (CME) is considered one of the major scientific goals at the Relativistic Heavy-Ion Collider (RHIC) towards understanding the nontrivial topological fluctuations of the Quantum…

Nuclear Experiment · Physics 2023-04-20 STAR Collaboration , B. E. Aboona , J. Adam , L. Adamczyk , J. R. Adams , I. Aggarwal , M. M. Aggarwal , Z. Ahammed , D. M. Anderson , E. C. Aschenauer , J. Atchison , V. Bairathi , W. Baker , J. G. Ball Cap , K. Barish , R. Bellwied , P. Bhagat , A. Bhasin , S. Bhatta , J. Bielcik , J. Bielcikova , J. D. Brandenburg , X. Z. Cai , H. Caines , M. Calderón de la Barca Sánchez , D. Cebra , J. Ceska , I. Chakaberia , P. Chaloupka , B. K. Chan , Z. Chang , D. Chen , J. Chen , J. H. Chen , Z. Chen , J. Cheng , Y. Cheng , S. Choudhury , W. Christie , X. Chu , H. J. Crawford , M. Csanád , G. Dale-Gau , A. Das , M. Daugherity , I. M. Deppner , A. Dhamija , L. Di Carlo , L. Didenko , P. Dixit , X. Dong , J. L. Drachenberg , E. Duckworth , J. C. Dunlop , J. Engelage , G. Eppley , S. Esumi , O. Evdokimov , A. Ewigleben , O. Eyser , R. Fatemi , S. Fazio , C. J. Feng , Y. Feng , E. Finch , Y. Fisyak , F. A. Flor , C. Fu , C. A. Gagliardi , T. Galatyuk , F. Geurts , N. Ghimire , A. Gibson , K. Gopal , X. Gou , D. Grosnick , A. Gupta , W. Guryn , A. Hamed , Y. Han , S. Harabasz , M. D. Harasty , J. W. Harris , H. Harrison , W. He , X. H. He , Y. He , N. Herrmann , L. Holub , C. Hu , Q. Hu , Y. Hu , H. Huang , H. Z. Huang , S. L. Huang , T. Huang , X. Huang , Y. Huang , Y. Huang , T. J. Humanic , D. Isenhower , M. Isshiki , W. W. Jacobs , A. Jalotra , C. Jena , A. Jentsch , Y. Ji , J. Jia , C. Jin , X. Ju , E. G. Judd , S. Kabana , M. L. Kabir , S. Kagamaster , D. Kalinkin , K. Kang , D. Kapukchyan , K. Kauder , H. W. Ke , D. Keane , M. Kelsey , Y. V. Khyzhniak , D. P. Kikoła , B. Kimelman , D. Kincses , I. Kisel , A. Kiselev , A. G. Knospe , H. S. Ko , L. K. Kosarzewski , L. Kramarik , L. Kumar , S. Kumar , R. Kunnawalkam Elayavalli , R. Lacey , J. M. Landgraf , J. Lauret , A. Lebedev , J. H. Lee , Y. H. Leung , N. Lewis , C. Li , C. Li , W. Li , X. Li , Y. Li , Y. Li , Z. Li , X. Liang , Y. Liang , R. Licenik , T. Lin , M. A. Lisa , C. Liu , F. Liu , H. Liu , H. Liu , L. Liu , T. Liu , X. Liu , Y. Liu , Z. Liu , T. Ljubicic , W. J. Llope , O. Lomicky , R. S. Longacre , E. Loyd , T. Lu , N. S. Lukow , X. F. Luo , L. Ma , R. Ma , Y. G. Ma , N. Magdy , D. Mallick , S. Margetis , C. Markert , H. S. Matis , J. A. Mazer , G. McNamara , K. Mi , S. Mioduszewski , B. Mohanty , I. Mooney , A. Mukherjee , M. I. Nagy , A. S. Nain , J. D. Nam , Md. Nasim , D. Neff , J. M. Nelson , D. B. Nemes , M. Nie , T. Niida , R. Nishitani , T. Nonaka , A. S. Nunes , G. Odyniec , A. Ogawa , S. Oh , K. Okubo , B. S. Page , R. Pak , J. Pan , A. Pandav , A. K. Pandey , T. Pani , A. Paul , B. Pawlik , D. Pawlowska , C. Perkins , J. Pluta , B. R. Pokhrel , M. Posik , T. Protzman , V. Prozorova , N. K. Pruthi , M. Przybycien , J. Putschke , Z. Qin , H. Qiu , A. Quintero , C. Racz , S. K. Radhakrishnan , N. Raha , R. L. Ray , R. Reed , H. G. Ritter , C. W. Robertson , M. Robotkova , M. A. Rosales Aguilar , D. Roy , P. Roy Chowdhury , L. Ruan , A. K. Sahoo , N. R. Sahoo , H. Sako , S. Salur , S. Sato , W. B. Schmidke , N. Schmitz , F-J. Seck , J. Seger , R. Seto , P. Seyboth , N. Shah , P. V. Shanmuganathan , M. Shao , T. Shao , M. Sharma , N. Sharma , R. Sharma , S. R. Sharma , A. I. Sheikh , D. Y. Shen , K. Shen , S. S. Shi , Y. Shi , Q. Y. Shou , F. Si , J. Singh , S. Singha , P. Sinha , M. J. Skoby , N. Smirnov , Y. Söhngen , Y. Song , B. Srivastava , T. D. S. Stanislaus , M. Stefaniak , D. J. Stewart , B. Stringfellow , Y. Su , A. A. P. Suaide , M. Sumbera , C. Sun , X. Sun , Y. Sun , Y. Sun , B. Surrow , Z. W. Sweger , P. Szymanski , A. Tamis , A. H. Tang , Z. Tang , T. Tarnowsky , J. H. Thomas , A. R. Timmins , D. Tlusty , T. Todoroki , C. A. Tomkiel , S. Trentalange , R. E. Tribble , P. Tribedy , T. Truhlar , B. A. Trzeciak , O. D. Tsai , C. Y. Tsang , Z. Tu , T. Ullrich , D. G. Underwood , I. Upsal , G. Van Buren , J. Vanek , I. Vassiliev , V. Verkest , F. Videbæk , S. A. Voloshin , F. Wang , G. Wang , J. S. Wang , X. Wang , Y. Wang , Y. Wang , Y. Wang , Z. Wang , J. C. Webb , P. C. Weidenkaff , G. D. Westfall , D. Wielanek , H. Wieman , G. Wilks , S. W. Wissink , R. Witt , J. Wu , J. Wu , X. Wu , Y. Wu , B. Xi , Z. G. Xiao , W. Xie , H. Xu , N. Xu , Q. H. Xu , Y. Xu , Y. Xu , Z. Xu , Z. Xu , G. Yan , Z. Yan , C. Yang , Q. Yang , S. Yang , Y. Yang , Z. Ye , Z. Ye , L. Yi , K. Yip , Y. Yu , H. Zbroszczyk , W. Zha , C. Zhang , D. Zhang , J. Zhang , S. Zhang , X. Zhang , Y. Zhang , Y. Zhang , Y. Zhang , Z. J. Zhang , Z. Zhang , Z. Zhang , F. Zhao , J. Zhao , M. Zhao , C. Zhou , J. Zhou , S. Zhou , Y. Zhou , X. Zhu , M. Zurek , M. Zyzak

Integrated cross sections of high-energy $e^+e^-$ electroproduction by an electron in an atomic field

The integrated cross sections of high-energy $e^+e^-$ electroproduction by an electron in an atomic field is studied. Importance of various contributions to these cross sections is discussed. It is shown that the Coulomb corrections are…

Nuclear Theory · Physics 2025-01-28 P. A. Krachkov , A. I. Milstein

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

NA49/NA61: results and plans on beam energy and system size scan at the CERN SPS

This paper presents results and plans of the NA49 and NA61/SHINE experiments at the CERN Super Proton Synchrotron concerning the study of relativistic nucleus-nucleus interactions. First, the NA49 evidence for the energy threshold of…

Nuclear Experiment · Physics 2019-08-14 M. Gazdzicki

New Results on Pb-Au Collisions at 40 AGeV from the CERES/NA45 Experiment

In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross…

Nuclear Experiment · Physics 2019-08-14 K. Filimonov

Low Mass Dimuon Production in Indium-Indium Collisions at the CERN SPS

NA60 is a fixed-target experiment at the CERN SPS which measured dimuon production in nucleus-nucleus and proton-nucleus collisions. In this paper we report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium…

Nuclear Experiment · Physics 2007-05-23 NA60 Collaboration , M. Floris , R. Arnaldi , R. Averbeck , K. Banicz , J. Castor , B. Chaurand , C. Cicalo , A. Colla , P. Cortese , S. Damjanovic , A. David , A. de Falco , A. Devaux , A. Dress , L. Ducroux , J. Farjeix , H. En'yo , A. Ferretti , A. Förster , P. Force , N. Guettet , A. Guichard , H. Gulkanian , J. Heuser , M. Keil , L. Kluberg , J. Lozano , C. Lourenço , F. Manso , A. Masoni , P. Martins , A. Neves , H. Ohnishi , C. Oppedisano , P. Parracho , P. Pillot , G. Puddu , E. Radermacher , P. Ramalhete , P. Rosinsky , E. Scomparin , J. Seixas , S. Serci , R. Shahoyan , P. Sonderegger , H. J. Specht , R. Tieulent , G. Usai , R. Veenhof , H. K. Wöhri

High Energy Photon-Photon Collisions -

The collisions of high energy photons produced at an electron-positron collider provide a comprehensive laboratory for testing QCD, electroweak interactions, and extensions of the Standard Model. The luminosity and energy of the colliding…

High Energy Physics - Phenomenology · Physics 2009-09-25 Stanley J. Brodsky , SLAC , Peter M. Zerwas , DESY

Atomic effects in astrophysical nuclear reactions

Two models are presented for the description of the electron screening effects that appear in laboratory nuclear reactions at astrophysical energies. The two-electron screening energy of the first model agrees very well with the recent LUNA…

Nuclear Theory · Physics 2009-11-06 Theodore E. Liolios

Recent results from the cosmic ray program of the NA61/SHINE experiment

NA61/SHINE is a fixed target experiment designed to study hadron-proton, hadron-nucleus and nucleus-nucleus interactions at the CERN Super-Proton-Synchrotron. In this paper we summarize the results from pion-carbon collisions recorded at…

High Energy Physics - Experiment · Physics 2019-05-22 Raul R. Prado

Latest results from NA60

The NA60 experiment has measured the production of muon pairs and of charged particles in In+In collisions at a beam energy of 158 AGeV. For invariant dimuon masses below the phi the space-time averaged rho spectral function was isolated by…

Nuclear Experiment · Physics 2008-11-26 A. Foerster

Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS

A search for Dark Sectors is performed using the unique M2 beam line at the CERN Super Proton Synchrotron. New particles ($X$) could be produced in the bremsstrahlung-like reaction of high energy 160 GeV muons impinging on an active target,…

High Energy Physics - Experiment · Physics 2024-09-17 Yu. M. Andreev , D. Banerjee , B. Banto Oberhauser , J. Bernhard , P. Bisio , N. Charitonidis , P. Crivelli , E. Depero , A. V. Dermenev , S. V. Donskov , R. R. Dusaev , T. Enik , V. N. Frolov , A. Gardikiotis , S. V. Gertsenberger , S. Girod , S. N. Gninenko , M. Hösgen , R. Joosten , V. A. Kachanov , Y. Kambar , A. E. Karneyeu , E. A. Kasianova , G. Kekelidze , B. Ketzer , D. V. Kirpichnikov , M. M. Kirsanov , V. N. Kolosov , V. A. Kramarenko , L. V. Kravchuk , N. V. Krasnikov , S. V. Kuleshov , V. E. Lyubovitskij , V. Lysan , V. A. Matveev , R. Mena Fredes , R. G. Mena Yanssen , L. Molina Bueno , M. Mongillo , D. V. Peshekhonov , V. A. Polyakov , B. Radics , K. M. Salamatin , V. D. Samoylenko , D. A. Shchukin , O. Soto , H. Sieber , V. O. Tikhomirov , I. V. Tlisova , A. N. Toropin , M. Tuzi , B. M. Veit , P. V. Volkov , V. Yu. Volkov , I. V. Voronchikhin , J. Zamora-Saá , A. S. Zhevlakov

Highlights from the NA60 experiment

The NA60 experiment is a fixed-target experiment at the CERN SPS. It has measured the dimuon yield in Indium--Indium collisions with an In beam of 158 AGeV/c and in p-A collisions with a proton beam of 400 and 158 AGeV/c. The results allow…

Nuclear Experiment · Physics 2007-05-24 A. Ferretti , R. Arnaldi , R. Averbeck , K. Banicz , J. Castor , B. Chaurand , C. Cicalò , A. Colla , P. Cortese , S. Damjanovic , A. David , A. De Falco , A. Devaux , A. Drees , L. Ducroux , H. En'yo , M. Floris , A. Förster , P. Force , N. Guettet , A. Guichard , H. Gulkanyan , J. M. Heuser , M. Keil , L. Kluberg , C. Lourenço , J. Lozano , F. Manso , P. Martins , A. Masoni , A. Neves , H. Ohnishi , C. Oppedisano , P. Parracho , P. Pillot , G. Puddu , E. Radermacher , P. Ramalhete , P. Rosinsky , E. Scomparin , J. Seixas , S. Serci , R. Shahoyan , P. Sonderegger , H. J. Specht , R. Tieulent , G. Usai , R. Veenhof , H. Wöhri

Electromagnetic interaction of low transverse momentum electrons and positrons with heavy nuclei in ultra-peripheral ultra-relativistic heavy-ion collisions

The photon-photon interaction in ultra-relativistic heavy-ion collision is a source of the $(e^+,e^-)$ pairs. The photon-photon fusion leads the lepton creation in the broad configuration space around "collision" point. Those created close…

Nuclear Theory · Physics 2022-12-28 Katarzyna Mazurek , Mariola Kłusek-Gawenda , Antoni Szczurek

New Results from the Cosmic-Ray Program of the NA61/SHINE facility at the CERN SPS

The NA61/SHINE experiment at the SPS accelerator at CERN is a unique facility for the study of hadronic interactions at fixed target energies. The data collected with NA61/SHINE is relevant for a broad range of topics in cosmic-ray physics…

High Energy Astrophysical Phenomena · Physics 2019-09-17 Michael Unger , NA61 Collaboration