Related papers: Global QCD Analysis and Dark Photons

Improved Evaluation of the Hadronic Vacuum Polarization Contributions to Muon $g-2$ and $\bar\alpha_{\rm QED}(M_Z)$ Using High Order QCD Calculations

We use recently evaluated radiative and nonperturbative corrections to production of heavy quarks by a vector current to give very precise theoretical calculations of the high energy ($t^{1/2}\geq \sqrt{2}$ GeV) imaginary part of the photon…

High Energy Physics - Phenomenology · Physics 2007-05-23 K. Adel , F. J. Ynduráin

Chiral Composite Asymmetric Dark Matter

The asymmetric dark matter (ADM) scenario solves the baryon-dark matter coincidence problem when the dark matter (DM) mass is of $\mathcal{O}(1)$GeV. Composite ADM models based on QCD-like strong dynamics are particularly motivated since…

High Energy Physics - Phenomenology · Physics 2021-08-18 Masahiro Ibe , Shin Kobayashi , Keiichi Watanabe

Recent investigations of QCD at HERA

The latest results from the H1 and ZEUS collaborations which challenge the QCD description of high energy $ep$ collisions are presented. Data from HERA continue to provide precision measurements and are compared to the latest theoretical…

High Energy Physics - Experiment · Physics 2017-07-18 Matthew Wing

Search for a hypothetical gauge boson and dark photons in charmonium transitions

We report a direct search for a new gauge boson, $X$, with a mass of $17~\text{MeV}/c^2$, which could explain the anomalous excess of $e^+e^-$ pairs observed in the $^8\text{Be}$ nuclear transitions. The search is conducted in the…

High Energy Physics - Experiment · Physics 2026-02-18 BESIII Collaboration , M. Ablikim , M. N. Achasov , P. Adlarson , X. C. Ai , R. Aliberti , A. Amoroso , Q. An , Y. Bai , O. Bakina , Y. Ban , H. -R. Bao , V. Batozskaya , K. Begzsuren , N. Berger , M. Berlowski , M. B. Bertani , D. Bettoni , F. Bianchi , E. Bianco , A. Bortone , I. Boyko , R. A. Briere , A. Brueggemann , H. Cai , M. H. Cai , X. Cai , A. Calcaterra , G. F. Cao , N. Cao , S. A. Cetin , X. Y. Chai , J. F. Chang , T. T. Chang , G. R. Che , Y. Z. Che , C. H. Chen , Chao Chen , G. Chen , H. S. Chen , H. Y. Chen , M. L. Chen , S. J. Chen , S. M. Chen , T. Chen , X. R. Chen , X. T. Chen , X. Y. Chen , Y. B. Chen , Y. Q. Chen , Z. K. Chen , J. C. Cheng , L. N. Cheng , S. K. Choi , X. Chu , G. Cibinetto , F. Cossio , J. Cottee-Meldrum , H. L. Dai , J. P. Dai , X. C. Dai , A. Dbeyssi , R. E. de Boer , D. Dedovich , C. Q. Deng , Z. Y. Deng , A. Denig , I. Denisenko , M. Destefanis , F. De Mori , X. X. Ding , Y. Ding , Y. X. Ding , J. Dong , L. Y. Dong , M. Y. Dong , X. Dong , M. C. Du , S. X. Du , S. X. Du , X. L. Du , Y. Y. Duan , Z. H. Duan , P. Egorov , G. F. Fan , J. J. Fan , Y. H. Fan , J. Fang , J. Fang , S. S. Fang , W. X. Fang , Y. Q. Fang , L. Fava , F. Feldbauer , G. Felici , C. Q. Feng , J. H. Feng , L. Feng , Q. X. Feng , Y. T. Feng , M. Fritsch , C. D. Fu , J. L. Fu , Y. W. Fu , H. Gao , Y. Gao , Y. N. Gao , Y. N. Gao , Y. Y. Gao , Z. Gao , S. Garbolino , I. Garzia , L. Ge , P. T. Ge , Z. W. Ge , C. Geng , E. M. Gersabeck , A. Gilman , K. Goetzen , J. D. Gong , L. Gong , W. X. Gong , W. Gradl , S. Gramigna , M. Greco , M. H. Gu , C. Y. Guan , A. Q. Guo , J. N. Guo , L. B. Guo , M. J. Guo , R. P. Guo , X. Guo , Y. P. Guo , A. Guskov , J. Gutierrez , T. T. Han , F. Hanisch , K. D. Hao , X. Q. Hao , F. A. Harris , C. Z. He , K. L. He , F. H. Heinsius , C. H. Heinz , Y. K. Heng , C. Herold , P. C. Hong , G. Y. Hou , X. T. Hou , Y. R. Hou , Z. L. Hou , H. M. Hu , J. F. Hu , Q. P. Hu , S. L. 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Search for a dark photon in the $\pi^0 \to e^+e^-\gamma$ decay

The presently world largest data sample of pi0 --> gamma e+e- decays containing nearly 5E5 events was collected using the WASA detector at COSY. A search for a dark photon U produced in the pi0 --> gamma U --> gamma e+e- decay from the…

High Energy Physics - Experiment · Physics 2013-10-04 COSY Collaboration , P. Adlarson , W. Augustyniak , W. Bardan , M. Bashkanov , F. S. Bergmann , M. Berłowski , H. Bhatt , A. Bondar , M. Büscher , H. Calén , I. Ciepał , H. Clement , D. Coderre , E. Czerwiński , K. Demmich , E. Doroshkevich , R. Engels , W. Erven , W. Eyrich , P. Fedorets , K. Föhl , K. Fransson , F. Goldenbaum , P. Goslawski , A. Goswami , K. Grigoryev , C. -O. Gullström , F. Hauenstein , L. Heijkenskjöld , V. Hejny , F. Hinterberger , M. Hodana , B. Höistad , A. Jany , B. R. Jany , L. Jarczyk , T. Johansson , B. Kamys , G. Kemmerling , F. A. Khan , A. Khoukaz , S. Kistryn , J. Klaja , H. Kleines , B. Kłos , M. Krapp , W. Krzemień , P. Kulessa , A. Kupść , A. Kuzmin , K. Lalwani , D. Lersch , L. Li , B. Lorentz , A. Magiera , R. Maier , P. Marciniewski , B. Mariański , U. -G. Meißner , M. Mikirtychiants , H. -P. Morsch , P. Moskal , B. K. Nandi , H. Ohm , I. Ozerianska , E. Perez del Rio , N. Piskunov , P. Pluciński , P. Podkopał , D. Prasuhn , A. Pricking , D. Pszczel , K. Pysz , A. Pyszniak , C. F. Redmer , J. Ritman , A. Roy , Z. Rudy , S. Sawant , S. Schadmand , A. Schmidt , T. Sefzick , V. Serdyuk , N. Shah , B. Shwartz , M. Siemaszko , R. Siudak , T. Skorodko , M. Skurzok , J. Smyrski , V. Sopov , R. Stassen , J. Stepaniak , E. Stephan , G. Sterzenbach , H. Stockhorst , H. Ströher , A. Szczurek , T. Tolba , A. Trzciński , R. Varma , G. J. Wagner , W. Wȩglorz , A. Wirzba , M. Wolke , A. Wrońska , P. Wüstner , P. Wurm , A. Yamamoto , J. Zabierowski , M. J. Zieliński , W. Zipper , J. Złomańczuk , P. Żuprański , M. Żurek

Matching NLO parton shower matrix element with exact phase space: case of W -> l nu (gamma) and gamma^* -> pi^+pi^-(gamma)

The PHOTOS Monte Carlo is often used for simulation of QED effects in decay of intermediate particles and resonances. Momenta are generated in such a way that samples of events cover the whole bremsstrahlung phase space. With the help of…

High Energy Physics - Phenomenology · Physics 2010-12-15 G. Nanava , Qingjun Xu , Z. Was

Constraining Cosmological Parameters with Observational Data Including Weak Lensing Effects

In this paper, we study the cosmological implications of the 100 square degree Weak Lensing survey (the CFHTLS-Wide, RCS, VIRMOS-DESCART and GaBoDS surveys). We combine these weak lensing data with the cosmic microwave background (CMB)…

Astrophysics · Physics 2010-05-07 Hong Li , Jie Liu , Jun-Qing Xia , Lei Sun , Zu-Hui Fan , Charling Tao , Andre Tilquin , Xinmin Zhang

Constraints on the dark photon from deep inelastic scattering

We investigate constraints on the dark photon arising from an analysis of deep inelastic scattering (DIS) data. We perform extractions of parton distribution functions (PDFs) with and without a dark photon being present and allow the dark…

High Energy Physics - Phenomenology · Physics 2022-02-08 A. W. Thomas , X. G. Wang , A. G. Williams

A Fast Earth-scattering Formalism for Light Dark Matter with Dark Photon Mediators

While Dark Matter (DM) is typically assumed to interact only very weakly with the particles of the Standard Model, many direct detection experiments are currently exploring regions of parameter space where DM can have a large scattering…

High Energy Physics - Phenomenology · Physics 2025-12-18 Agustín Lantero-Barreda , Carlos Centeno-Lorca , Bradley J. Kavanagh , Núria Castello-Mor

General Kinetic Mixing in Gauged $U(1)_{L_\mu-L_\tau}$ Model for Muon $g-2$ and Dark Matter

The gauged $U(1)_{L_\mu-L_\tau}$ extension of the Standard Model is a very simple framework that can alleviate the tension in muon anomalous magnetic dipole moment, reinforced by the recent Fermilab measurement. We explore experimental…

High Energy Physics - Phenomenology · Physics 2022-02-02 Timothy Hapitas , Douglas Tuckler , Yue Zhang

Search for dark photons at future e$^+$e$^-$ colliders

In a class of theories, dark matter is explained by postulating the existence of a `dark sector', which interacts gravitationally with ordinary matter. If this dark sector contains a U(1) symmetry, and a corresponding `dark' photon…

High Energy Physics - Phenomenology · Physics 2026-04-03 Mikael Berggren

Searching for Dark Photons at the LHeC and FCC-he

Extensions of the Standard Model (SM) gauge group with a new $U(1)_X$ predict an additional gauge boson. Through kinetic mixing with the SM photons featured by a coupling $\epsilon$, the ensuing so-called dark photons $\gamma'$, which…

High Energy Physics - Phenomenology · Physics 2020-02-05 Monica D'Onofrio , Oliver Fischer , Zeren Simon Wang

Determination of electroweak parameters in polarised deep-inelastic scattering at HERA

The parameters of the electroweak theory are determined in a combined electroweak and QCD analysis using all deep-inelastic $e^+p$ and $e^-p$ neutral current and charged current scattering cross sections published by the H1 Collaboration,…

High Energy Physics - Experiment · Physics 2018-09-24 H1 Collaboration , H. Spiesberger

Observational Constraints to Ricci Dark Energy Model by Using: SN, BAO, OHD, fgas Data Sets

In this paper, we perform a global constraint on the Ricci dark energy model with both the flat case and the non-flat case, using the Markov Chain Monte Carlo (MCMC) method and the combined observational data from the cluster X-ray gas mass…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Lixin Xu , Yuting Wang

Combination of Measurements of Inclusive Deep Inelastic $e^{\pm}p$ Scattering Cross Sections and QCD Analysis of HERA Data

A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current $e^{\pm}p$ scattering for zero beam polarisation. The data were taken…

High Energy Physics - Experiment · Physics 2015-11-23 H1 , ZEUS Collaborations

Constraints on Dark Photon and Dark $Z$ Model Parameters in the $B$ and $K$ Meson Decays

The study investigates flavor-changing neutral current (FCNC) decays of $B$ and $K$ mesons in the context of a dark $U(1)_D$ model with a dark photon/dark $Z$ mass between 10 MeV and 2 GeV. While the model improves the fit to certain decay…

High Energy Physics - Phenomenology · Physics 2024-12-17 Ahmed Rashed

Hunting down massless dark photons in kaon physics

If dark photons are massless, they couple to standard-model particles only via higher dimensional operators, while the kinetic mixing with photons, which motivates most of the current experimental searches, is absent. We consider the effect…

High Energy Physics - Phenomenology · Physics 2017-07-26 M. Fabbrichesi , E. Gabrielli , B. Mele

QCD knows new quarks

We find that a big gap between indicators for the breaking strengths of the global chiral SU(2) and U(1) axial symmetries in QCD of the Standard Model (SM) can be interpreted as a new fine-tuning problem. This may thus imply calling for a…

High Energy Physics - Phenomenology · Physics 2024-02-05 Chuan-Xin Cui , Hiroyuki Ishida , Mamiya Kawaguchi , Jin-Yang Li , Shinya Matsuzaki , Akio Tomiya

Probing Dark Photon Dark Matter with CTAO

The dark photon is a new hypothetical gauge boson arising in extensions of the Standard Model, and constitutes a compelling dark matter candidate. As dark photon dark matter (DPDM), it can interact with electromagnetic fields via kinetic…

High Energy Astrophysical Phenomena · Physics 2026-02-26 Júlia G. Mamprim , Aion Viana , Vitor de Souza

Dark photon kinetic mixing effects for the CDF W-mass measurement

A new $U(1)_X$ gauge boson $X$ primarily interacting with a dark sector can have renormalizable kinetic mixing with the standard model (SM) $U(1)_Y$ gauge boson $Y$. This mixing besides introduces interactions of dark photon and dark sector…

High Energy Physics - Phenomenology · Physics 2022-09-21 Yu Cheng , Xiao-Gang He , Fei Huang , Jin Sun , Zhi-Peng Xing