Related papers: Measuring Hadronization Length in e^+ e^- \rightar…

New result on the measurement of the direct photon emission in K+ --> pi^+ pi^0 gamma decay

We present a new result on the K^+ --> pi^+ pi^0 gamma decay measurement using stopped kaons. The best fit to the decay spectrum comprised of 10k events gives a branching ratio for the direct photon emission of [3.8+-0.8(stat)+-0.7(syst)]…

High Energy Physics - Experiment · Physics 2008-11-26 M. A. Aliev , Y. Asano , P. Depommier

Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold

The $\gamma + p \rightarrow K^0 + \Sigma^+$ photoproduction reaction is investigated in the energy region from threshold to $E_\gamma = 2250$\,MeV. The differential cross section exhibits increasing forward-peaking with energy, but only up…

Nuclear Experiment · Physics 2015-06-03 R. Ewald , A. V. Anisovich , B. Bantes , O. Bartholomy , D. Bayadilov , R. Beck , Y. A. Beloglazov , K. -T. Brinkmann , V. Crede , H. Dutz , D. Elsner , K. Fornet-Ponse , F. Frommberger , Ch. Funke , A. B. Gridnev , E. Gutz , W. Hillert , J. Hannappel , P. Hoffmeister , I. Jaegle , O. Jahn , T. Jude , J. Junkersfeld , H. Kalinowsky , S. Kammer , V. Kleber , Frank Klein , Friedrich Klein , E. Klempt , B. Krusche , M. Lang , H. Löhner , I. V. Lopatin , D. Menze , T. Mertens , J. G. Messchendorp , V. Metag , M. Nanova , V. A. Nikonov , D. Novinski , R. Novotny , M. Ostrick , L. Pant , H. van Pee , A. Roy , A. V. Sarantsev , S. Schadmand , Ch. Schmidt , H. Schmieden , B. Schoch , S. Shende , V. Sokhoyan , A. Süle , V. V. Sumachev , T. Szczepanek , U. Thoma , D. Trnka , R. Varma , D. Walther , Ch. Wendel

Diphoton Generalized Distribution Amplitudes

We calculate the leading order diphoton generalized distribution amplitude by calculating the amplitude of the process gamma* gamma -> gamma gamma in the low energy and high photon virtuality region at the Born order and in the leading…

High Energy Physics - Phenomenology · Physics 2008-11-26 M. El Beiyad , B. Pire , L. Szymanowski , S. Wallon

Improved measurement of the semileptonic decay $D^+_{s}\to K^0 e^+\nu_e$

Analyzing $e^+e^-$ collision data corresponding to an integrated luminosity of $7.33~\mathrm{fb}^{-1}$ collected at center-of-mass energies between 4.128 and 4.226~GeV with the BESIII detector, we measure the branching fraction of the…

High Energy Physics - Experiment · Physics 2025-02-07 BESIII Collaboration , M. Ablikim , M. N. Achasov , P. Adlarson , O. Afedulidis , X. C. Ai , R. Aliberti , A. Amoroso , Q. An , Y. Bai , O. Bakina , I. Balossino , Y. Ban , H. -R. Bao , V. Batozskaya , K. Begzsuren , N. Berger , M. Berlowski , M. Bertani , D. Bettoni , F. Bianchi , E. Bianco , 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 , G. R. Che , G. Chelkov , C. Chen , C. H. Chen , Chao Chen , G. Chen , H. S. Chen , H. Y. Chen , M. L. Chen , S. J. Chen , S. L. Chen , S. M. Chen , T. Chen , X. R. Chen , X. T. Chen , Y. B. Chen , Y. Q. Chen , Z. J. Chen , Z. Y. Chen , S. K. Choi , G. Cibinetto , F. Cossio , J. J. Cui , H. L. Dai , J. P. Dai , A. Dbeyssi , R. E. de Boer , D. Dedovich , C. Q. Deng , 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 , M. C. Du , S. X. Du , Y. Y. Duan , Z. H. Duan , P. Egorov , Y. H. Fan , J. Fang , J. Fang , S. S. Fang , W. X. Fang , Y. Fang , Y. Q. Fang , R. Farinelli , L. Fava , F. Feldbauer , G. Felici , C. Q. Feng , J. H. Feng , Y. T. Feng , M. Fritsch , C. D. Fu , J. L. Fu , Y. W. Fu , H. Gao , X. B. Gao , Y. N. Gao , Yang Gao , S. Garbolino , I. Garzia , L. Ge , 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 , A. Q. Guo , L. B. Guo , M. J. Guo , R. P. Guo , Y. P. Guo , A. Guskov , J. Gutierrez , K. L. Han , T. T. Han , F. Hanisch , 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 , X. T. Hou , Y. R. Hou , Z. L. Hou , B. Y. Hu , H. M. Hu , J. F. Hu , S. L. Hu , T. Hu , Y. Hu , G. S. Huang , K. X. Huang , L. Q. Huang , X. T. Huang , Y. P. Huang , Y. S. Huang , T. Hussain , F. Hölzken , N. Hüsken , N. in der Wiesche , J. Jackson , S. Janchiv , J. H. Jeong , Q. Ji , Q. P. Ji , W. Ji , X. B. Ji , X. L. Ji , Y. Y. Ji , X. Q. Jia , Z. K. Jia , D. Jiang , H. B. Jiang , P. C. Jiang , S. S. Jiang , T. J. Jiang , X. S. Jiang , Y. Jiang , J. B. Jiao , J. K. Jiao , Z. Jiao , S. Jin , Y. Jin , M. Q. Jing , X. M. Jing , T. Johansson , S. Kabana , N. Kalantar-Nayestanaki , X. L. Kang , X. S. Kang , M. Kavatsyuk , B. C. Ke , V. Khachatryan , A. Khoukaz , R. Kiuchi , O. B. Kolcu , B. Kopf , M. Kuessner , X. Kui , N. Kumar , A. Kupsc , W. Kühn , J. J. Lane , L. Lavezzi , T. T. Lei , Z. H. Lei , M. Lellmann , T. Lenz , C. Li , C. Li , C. H. Li , Cheng Li , D. M. Li , F. Li , G. Li , H. B. Li , H. J. Li , H. N. Li , Hui Li , J. R. Li , J. S. Li , K. Li , L. J. Li , L. K. Li , Lei Li , M. H. Li , P. R. Li , Q. M. Li , Q. X. Li , R. Li , S. X. Li , T. Li , W. D. Li , W. G. Li , X. Li , X. H. Li , X. L. Li , X. Y. Li , X. Z. Li , Y. G. Li , Z. J. Li , Z. Y. Li , C. Liang , H. Liang , H. Liang , Y. F. Liang , Y. T. Liang , G. R. Liao , Y. P. Liao , J. Libby , A. Limphirat , C. C. Lin , D. X. Lin , T. Lin , B. J. Liu , B. X. Liu , C. Liu , C. X. Liu , F. Liu , F. H. Liu , Feng Liu , G. M. Liu , H. Liu , H. B. Liu , H. H. Liu , H. M. Liu , Huihui Liu , J. B. Liu , J. Y. Liu , K. Liu , K. Y. Liu , Ke Liu , L. Liu , L. C. Liu , Lu Liu , M. H. Liu , N. Liu , P. L. Liu , Q. Liu , S. B. Liu , T. Liu , W. K. Liu , W. M. Liu , X. Liu , X. Liu , Y. Liu , Y. Liu , Y. B. Liu , Z. A. Liu , Z. D. 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 , J. R. Luo , M. X. Luo , T. Luo , X. L. Luo , X. R. Lyu , Y. F. Lyu , F. C. Ma , H. Ma , H. L. Ma , J. L. Ma , L. L. Ma , L. R. Ma , M. M. Ma , Q. M. Ma , R. Q. Ma , T. Ma , X. T. Ma , X. Y. Ma , Y. Ma , Y. M. Ma , F. E. Maas , M. Maggiora , S. Malde , 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 , B. Moses , N. Yu. Muchnoi , J. Muskalla , Y. Nefedov , F. Nerling , L. S. Nie , I. B. Nikolaev , Z. Ning , S. Nisar , Q. L. Niu , W. D. Niu , Y. Niu , S. L. Olsen , Q. Ouyang , S. Pacetti , X. Pan , Y. Pan , A. Pathak , Y. P. Pei , M. Pelizaeus , H. P. Peng , Y. Y. Peng , K. Peters , J. L. Ping , R. G. Ping , S. Plura , V. Prasad , F. Z. Qi , H. Qi , H. R. Qi , M. Qi , T. Y. Qi , S. Qian , W. B. Qian , C. F. Qiao , X. K. Qiao , J. J. Qin , L. Q. Qin , L. Y. Qin , X. P. Qin , X. S. Qin , Z. H. Qin , J. F. Qiu , Z. H. Qu , C. F. Redmer , K. J. Ren , A. Rivetti , M. Rolo , G. Rong , Ch. Rosner , S. N. Ruan , N. Salone , A. Sarantsev , Y. Schelhaas , K. Schoenning , M. Scodeggio , K. Y. Shan , W. Shan , X. Y. Shan , Z. J. Shang , J. F. Shangguan , L. G. Shao , M. Shao , C. P. Shen , H. F. Shen , W. H. Shen , X. Y. Shen , B. A. Shi , H. Shi , H. C. Shi , J. L. Shi , J. Y. Shi , Q. Q. Shi , S. Y. Shi , X. Shi , J. J. Song , T. Z. Song , W. M. Song , Y. J. 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H. Zhu , T. J. Zhu , W. D. Zhu , Y. C. Zhu , Z. A. Zhu , J. H. Zou , J. Zu

Theory on Hadrons in Nuclear Medium

After decades-long attempts to measure the mass shift and understand the origin of hadron mass, it became clear that one has to analyze hadrons with small vacuum width. Also, to identify the effect of chiral symmetry breaking, one has to…

Nuclear Theory · Physics 2020-01-08 Su Houng Lee

Hadronic light-by-light scattering in the muon g-2: impact of proposed measurements of the (pi^0 -> gamma gamma) decay width and the (gamma^* gamma -> pi^0) transition form factor with the KLOE-2 experiment

The calculation of the hadronic light-by-light scattering contribution to the muon g-2 currently relies entirely on models. Measurements of the form factors which describe the interactions of hadrons with photons can help to constrain the…

High Energy Physics - Phenomenology · Physics 2013-06-26 Andreas Nyffeler

Probing partonic structure in gamma* gamma -> pi pi near threshold

Hadron pair production gamma* gamma -> h hbar in the region where the c.m. energy is much smaller than the photon virtuality can be described in a factorized form, as the convolution of a partonic handbag diagram and generalized…

High Energy Physics - Phenomenology · Physics 2009-10-31 M. Diehl , T. Gousset , B. Pire , O. Teryaev

Photon splitting and Compton scattering in strongly magnetized hot plasma

The process of photon splitting is investigated in the presence of strongly magnetized electron-positron plasma. The amplitude of the process is calculated in general case of plasma with nonzero chemical potential and temperature. The…

High Energy Physics - Phenomenology · Physics 2012-09-03 M. V. Chistyakov , D. A. Rumyantsev , N. S. Stus'

Hard Photon Pair Production at LEP

The production of photon pairs in $e^+e^-\rightarrow f \bar f \gamma\gamma$ processes is studied using exact helicity amplitudes at tree level. Total cross sections, including initial state radiation effects, are given. They are presented…

High Energy Physics - Phenomenology · Physics 2009-10-22 A. Ballestrero , E. Maina , S. Moretti

Measurement of the $e^+e^-\to\pi^+\pi^-\pi^0\pi^0$ cross section using initial-state radiation at BaBar

The process $e^+e^- \to \pi^+\pi^-2\pi^0\gamma$ is investigated by means of the initial-state radiation technique, where a photon is emitted from the incoming electron or positron. Using $454.3 \rm{fb}^{-1}$ of data collected around a…

High Energy Physics - Experiment · Physics 2017-12-06 The BaBar Collaboration

On propagation of photons in a magnetized medium

The aim of this work is to solve the dispersion relations near the first excitation threshold of photon propagating along the magnetic field in the strong field limit. We have calculated the time damping of the photon in two particular…

High Energy Astrophysical Phenomena · Physics 2015-08-06 L. Cruz Rodríguez , A. Pérez Martínez , H. Pérez Rojas , E. Rodríguez Querts

Wavelength Measurements of K Transitions of Oxygen, Neon, and Magnesium with X-ray Absorption Lines

Accurate atomic transition data are important in many astronomical research areas especially in line spectroscopy study. Whereas transition data of He-like and H-like ions (i.e., ions at high-charge states) are accurately calculated, that…

High Energy Astrophysical Phenomena · Physics 2013-11-04 Jin-Yuan Liao , Shuang-Nan Zhang , Yangsen Yao

Kaon photoproduction and electroproduction near threshold

We analyze the electromagnetic production of K^+Lambda and K^0Lambda near their production thresholds by using isobar models. In the K^+Lambda channel we show that the model can nicely describe the available experimental data. In the…

High Energy Physics - Phenomenology · Physics 2015-05-27 T. Mart

Observation of radiative B -> phi K gamma decays

The radiative decay $B \to \phi K \gamma$ is observed for the first time. The branching fraction for the charged $B^- \to \phi K^- \gamma$ decay mode is measured to be ${\cal B}(B^- \to \phi K^- \gamma) = (3.4 \pm 0.9 \pm 0.4) \times…

High Energy Physics - Experiment · Physics 2008-11-26 A. Drutskoy

Cross Sections for the Reactions e+e- --> K+ K- pi+pi-, K+ K- pi0pi0, and K+ K- K+ K- Measured Using Initial-State Radiation Events

We study the processes e+e- --> K+ K- pi+pi-gamma, K+ K- pi0pi0gamma, and K+ K- K+ K-gamma, where the photon is radiated from the initial state. About 84000, 8000, and 4200 fully reconstructed events, respectively, are selected from 454…

High Energy Physics - Experiment · Physics 2015-03-19 The BABAR Collaboration , J. P. Lees

Theoretical description of circular dichroism in photoelectron angular distributions of randomly oriented chiral molecules after multi-photon photoionization

Photoelectron circular dichroism refers to the forward/backward asymmetry in the photoelectron angular distribution with respect to the propagation axis of circularly polarized light. It has recently been demonstrated in femtosecond…

Quantum Physics · Physics 2017-01-16 R. E. Goetz , T. A. Isaev , B. Nikoobakht , R. Berger , C. P. Koch

A Quantum Mechanical Approach To The Polarization Transport of Photons

Based on quantum mechanical approach the polarization transport of photons which propagate in a medium with slow varying refractive index is studied. The photon polarizations are separated in opposite directions normal to the ray which is…

Quantum Physics · Physics 2015-05-19 Reza Torabi

Gluon Polarization in e^+e^- -> t \bar t G: Polar Angle Dependence and Beam Polarization Effects

We calculate the linear and circular polarization of gluons produced in conjunction with massive quarks in the annihilation process $e^+e^-\to q \bar q G$. The linear polarization is calculated in the hadron event plane as well as in the…

High Energy Physics - Phenomenology · Physics 2011-09-13 S. Groote , J. G. Körner , J. A. Leyva

Two Photon Contribution to Polarization in $K^+ \rightarrow \pi^+ \mu^+ \mu^-$

Short distance physics involving virtual top and charm quarks contributes to $\mu^+$ (and $\mu^-$) polarization in the decay $K^+ \rightarrow \pi^+ \mu^+ \mu^-$. Measurement of the parity violating asymmetry $(\Gamma_R - \Gamma_L)/(\Gamma_R…

High Energy Physics - Phenomenology · Physics 2010-11-01 Ming Lu , Mark B. Wise , Martin J. Savage

Charm hadronisation in gamma-p collisions with ZEUS at HERA

The measured D*+/-, D0, D+/-, D_s+/- and /\_c+/- photoproduction cross sections have been used to determine charm fragmentation ratios and fractions of c quarks hadronising as a particular charm hadron, f(c -> D, /\_c). Events with a D*+/-…

High Energy Physics - Experiment · Physics 2019-08-14 Leonid Gladilin