Related papers: Recent BABAR Results on Two-photon Physics

Measurement of the gamma gamma* --> pi0 transition form factor

We study the reaction e+e- --> e+e-pi0 and measure the gamma gamma* --> pi0 transition form factor in the momentum transfer range from 4 to 40 GeV^2. The analysis is based on 442 fb^-1 of integrated luminosity collected at PEP-II with the…

High Energy Physics - Experiment · Physics 2010-04-12 The BABAR Collaboration , B. Aubert

High statistics study of the reaction $\gamma p\to p\;2\pi^0$

The photoproduction of 2$\pi^0$ mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a radiator was tagged in the energy range from 600\,MeV to…

Nuclear Experiment · Physics 2015-12-07 V. Sokhoyan , E. Gutz , V. Crede , H. van Pee , A. V. Anisovich , J. C. S. Bacelar , B. Bantes , O. Bartholomy , D. Bayadilov , R. Beck , Y. A. Beloglazov , R. Castelijns , H. Dutz , D. Elsner , R. Ewald , F. Frommberger , M. Fuchs , Ch. Funke , R. Gregor , A. B. Gridnev , W. Hillert , Ph. Hoffmeister , I. Horn , I. Jaegle , J. Junkersfeld , H. Kalinowsky , S. Kammer , V. Kleber , Frank Klein , Friedrich Klein , E. Klempt , M. Kotulla , B. Krusche , M. Lang , H. Löhner , I. V. Lopatin , S. Lugert , T. Mertens , J. G. Messchendorp , V. Metag , B. Metsch , M. Nanova , V. A. Nikonov , D. Novinsky , R. Novotny , M. Ostrick , L. Pant , M. Pfeiffer , D. Piontek , A. Roy , A. V. Sarantsev , Ch. Schmidt , H. Schmieden , T. Seifen , S. Shende , A. Süle , V. V. Sumachev , T. Szczepanek , A. Thiel , U. Thoma , D. Trnka , R. Varma , D. Walther , Ch. Wendel , A. Wilson

Recent Results on Light Meson Physics

Some recent results on light meson physics are reviewed. The new evidence of low mass scalar mesons together with an improved measurement of the phi radiative decays in scalar mesons, give new insight into the nature and the structure of…

High Energy Physics - Experiment · Physics 2007-05-23 C. Bini

Measurement of the gamma gamma -> pi+ pi- and gamma gamma -> K+ K- processes at energies of 2.4 - 4.1 GeV

We have measured pi+pi- and K+K- production in two-photon collisions using 87.7 /fb of data collected with the Belle detector at the asymmetric energy e+e- collider KEKB. The cross sections are measured to high precision in the two-photon…

High Energy Physics - Experiment · Physics 2019-08-14 H. Nakazawa

Isobar model analysis of pi0-eta photoproduction on protons

Photoproduction of pi0-eta on protons in the energy range from threshold to 1.4 GeV is discussed. The data for representative angular distributions recently obtained at MAMI C are analyzed using an isobar model. The isobars considered are…

Nuclear Theory · Physics 2014-11-20 A. Fix , V. L. Kashevarov , A. Lee , M. Ostrick

Meson photoproduction in the first and second resonance region

The study of baryon resonances via meson photoproduction reactions on the free proton and on nucleons in the nuclear medium is discussed. Special emphasis is laid on the production of neutral mesons which due to the suppression of…

Nuclear Experiment · Physics 2007-05-23 B. Krusche

Exclusive B decays to charmonium final states

We report on exclusive decays of B mesons into final states containing charmonium using data collected with the BABAR detector at the PEP-II storage rings. The charmonium states considered here are J/psi, psi(2S), and chi_C1. Branching…

High Energy Physics - Experiment · Physics 2007-05-23 The BABAR Collaboration , B. Aubert

Study of B^{+-} -> K^{+-}(K_S K pi)^0 Decay and Determination of eta_c and eta_c(2S) Parameters

We report the results of a study of $B^{\pm}\to K^{\pm}\eta_c$ and $B^{\pm}\to K^{\pm}\eta_c(2S)$ decays followed by $\eta_c$ and $\eta_c(2S)$ decays to $(K_SK\pi)^0$. The results are obtained from a data sample containing 535 million…

High Energy Physics - Experiment · Physics 2015-05-28 Belle collaboration , A. Vinokurova , A. Kuzmin , S. Eidelman , K. Arinstein , V. Aulchenko , T. Aushev , A. M. Bakich , V. Balagura , E. Barberio , K. Belous , V. Bhardwaj , A. Bondar , A. Bozek , M. Bracko , J. Brodzicka , T. E. Browder , M. -C. Chang , Y. Chao , A. Chen , P. Chen , B. G. Cheon , R. Chistov , I. -S. Cho , K. Cho , S. -K. Choi , Y. Choi , J. Dalseno , M. Danilov , Z. Dolezal , D. Epifanov , V. Gaur , N. Gabyshev , A. Garmash , B. Golob , H. Ha , J. Haba , H. Hayashii , Y. Horii , Y. Hoshi , W. -S. Hou , Y. B. Hsiung , H. J. Hyun , T. Iijima , K. Inami , A. Ishikawa , R. Itoh , M. Iwabuchi , T. Iwashita , T. Julius , J. H. Kang , P. Kapusta , T. Kawasaki , C. Kiesling , H. J. Kim , H. O. Kim , M. J. Kim , Y. J. Kim , K. Kinoshita , B. R. Ko , P. Krizan , R. Kumar , T. Kumita , Y. -J. Kwon , S. -H. Kyeong , M. J. Lee , S. -H. Lee , J. Li , Y. Li , C. -L. Lim , C. Liu , D. Liventsev , R. Louvot , D. Matvienko , A. Matyja , S. McOnie , K. Miyabayashi , H. Miyata , Y. Miyazaki , R. Mizuk , G. B. Mohanty , A. Moll , E. Nakano , H. Nakazawa , Z. Natkaniec , S. Nishida , O. Nitoh , T. Ohshima , S. Okuno , S. L. Olsen , P. Pakhlov , G. Pakhlova , C. W. Park , R. Pestotnik , M. Petric , L. E. Piilonen , A. Poluektov , M. Röhrken , S. Ryu , H. Sahoo , Y. Sakai , O. Schneider , C. Schwanda , K. Senyo , O. Seon , M. Shapkin , V. Shebalin , C. P. Shen , J. -G. Shiu , B. Shwartz , F. Simon , P. Smerkol , Y. -S. Sohn , A. Sokolov , E. Solovieva , S. Stanic , M. Staric , M. Sumihama , T. Sumiyoshi , S. Tanaka , Y. Teramoto , I. Tikhomirov , K. Trabelsi , M. Uchida , T. Uglov , Y. Unno , S. Uno , Y. Usov , G. Varner , K. E. Varvell , A. Vossen , C. H. Wang , P. Wang , M. Watanabe , Y. Watanabe , K. M. Williams , E. Won , B. D. Yabsley , Y. Yamashita , C. Z. Yuan , Z. P. Zhang , V. Zhilich , P. Zhou , V. Zhulanov , A. Zupanc , O. Zyukova

Photoproduction of Pion and Kaon Pairs

S-wave photoproduction of pion and kaon pairs on hydrogen is studied. Coupled channel final state interactions between different pseudoscalar mesons are included. Effective mass and momentum transfer distributions as well as total cross…

High Energy Physics - Phenomenology · Physics 2011-04-20 L. Lesniak

Measurement of the D_(sJ)(2317) and D_(sJ)(2460) Properties in e^+ e^- --> c c-bar Production

The properties of the $\DsTT$ and $\DsFE$ mesons are studied using 125 ${\rm fb}^{-1}$ of $e^+e^- \to c \bar{c}$ data collected by the BaBar experiment. Preliminary mass estimates of $[2318.9\pm 0.3 ({\rm stat.}) \pm 0.9 ({\rm syst.})]$…

High Energy Physics - Experiment · Physics 2007-05-23 The BABAR Collaboration , B. Aubert

Measurement of Time-Dependent CP-Violating Asymmetries and Constraints on sin(2 beta+gamma) with Partial Reconstruction of B->D*-+pi+- Decays

We present a measurement of the time-dependent CP-violating asymmetries in decays of neutral B mesons to the final states D*-+ pi+-, using approximately 232 million BBbar events recorded by the BABAR experiment at the PEP2 e+e- storage…

High Energy Physics - Experiment · Physics 2010-03-19 The BABAR Collaboration , B. Aubert

Initial State Radiation and Inclusive Hadron Production Measurements at BABAR

The status of analysis of processes with hard photon emitted from the initial state (ISR) at BABAR is presented. We tag events by the presence of a hard photon in the detector, then reconstruct mu+mu- and several exclusive hadronic final…

High Energy Physics - Experiment · Physics 2007-05-23 F. Anulli

Two-photon decays of pi^0, eta and eta-prime

We investigate the decays of pi^0, eta and eta-prime into two photons in an effective U(3) chiral Lagrangian approach without employing large N_c arguments. Tree level and one-loop contributions from the anomalous Wess-Zumino-Witten…

High Energy Physics - Phenomenology · Physics 2014-11-17 B. Borasoy , R. Nissler

a0+(980)-resonance production in the reaction pp -> dpi+eta close to the K(bar(K)) threshold

The reaction pp -> dpi+eta has been measured at a beam energy of T=2.65 GeV (p=3.46 GeV/c) using the ANKE spectrometer at COSY-Juelich. The missing mass distribution of the detected dpi+ pairs exhibits a peak around the eta mass on top of a…

Nuclear Experiment · Physics 2008-11-26 P. Fedorets , M. Buescher , V. P. Chernyshev , S. Dymov , V. Yu. Grishina , C. Hanhart , M. Hartmann , V. Hejny , V. Kleber , H. R. Koch , L. A. Kondratyuk , V. Koptev , A. E. Kudryavtsev , P. Kulessa , S. Merzliakov , S. Mikirtychiants , M. Nekipelov , H. Ohm , R. Schleichert , H. Stroeher , V. E. Tarasov , K. -H. Watzlawik , I. Zychor

Measurements of the mass and width of the eta_c using psi' -> gamma eta_c

The mass and width of the lowest lying S-wave spin singlet charmonium state, the eta_c, are measured using a data sample of 1.06x10^8 psi' decays collected with the BESIII detector at the BEPCII storage ring. We use a model that…

High Energy Physics - Experiment · Physics 2012-06-04 BESIII Collaboration , M. Ablikim , M. N. Achasov , D. Alberto , D. J. Ambrose , F. F. An , Q. An , Z. H. An , J. Z. Bai , R. B. Ferroli , Y. Ban , J. Becker , N. Berger , M. B. Bertani , J. M. Bian , E. Bogera , O. Bondarenko , I. Boyko , R. A. Briere , V. Bytev , X. Cai , A. C. Calcaterra , G. F. Cao , J. F. Chang , G. Chelkova , G. Chen , H. S. Chen , H. X. Chen , J. C. Chen , M. L. Chen , S. J. Chen , Y. Chen , Y. B. Chen , H. P. Cheng , Y. P. Chu , D. Cronin-Hennessy , H. L. Dai , J. P. Dai , D. Dedovich , Z. Y. Deng , I. Denysenkob , M. Destefanis , W. L. Ding , Y. Ding , L. Y. Dong , M. Y. Dong , S. X. Du , J. Fang , S. S. Fang , C. Q. Feng , C. D. Fu , J. L. Fu , Y. Gao , C. Geng , K. Goetzen , W. X. Gong , M. Greco , M. H. Gu , Y. T. Gu , Y. H. Guan , A. Q. Guo , L. B. Guo , Y. P. Guo , Y. L. Han , X. Q. Hao , F. A. Harris , K. L. He , M. He , Z. Y. He , Y. K. Heng , Z. L. Hou , H. M. Hu , J. F. Hu , T. Hu , B. Huang , G. M. Huang , J. S. Huang , X. T. Huang , Y. P. Huang , T. Hussain , C. S. Ji , Q. Ji , X. B. Ji , X. L. Ji , L. K. Jia , L. L. Jiang , X. S. Jiang , J. B. Jiao , Z. Jiao , D. P. Jin , S. Jin , F. F. Jing , N. Kalantar-Nayestanaki , M. Kavatsyuk , W. Kuehn , W. Lai , J. S. Lange , J. K. C. Leung , C. H. Li , Cheng Li , Cui Li , D. M. Li , F. Li , G. Li , H. B. Li , J. C. Li , K. Li , Lei Li , N. B. Li , Q. J. Li , S. L. Li , W. D. Li , W. G. Li , X. L. Li , X. N. Li , X. Q. Li , X. R. Li , Z. B. Li , H. Liang , Y. F. Liang , Y. T. Liang , G. R. Liao , X. T. Liao , B. J. Liu , C. L. Liu , C. X. Liu , C. Y. Liu , F. H. Liu , Fang Liu , Feng Liu , H. Liu , H. B. Liu , H. H. Liu , H. M. Liu , H. W. Liu , J. P. Liu , K. Liu , K. Liu , K. Y. Liu , Q. Liu , S. B. Liu , X. Liu , X. H. Liu , Y. B. Liu , Yong Liu , Z. A. Liu , Zhiqiang Liu , Zhiqing Liu , H. Loehner , G. R. Lu , H. J. Lu , J. G. Lu , Q. W. Lu , X. R. Lu , Y. P. Lu , C. L. Luo , M. X. Luo , T. Luo , X. L. Luo , M. Lv , C. L. Ma , F. C. Ma , H. L. Ma , Q. M. Ma , S. Ma , T. Ma , X. Y. Ma , M. Maggiora , Q. A. Malik , H. Mao , Y. J. Mao , Z. P. Mao , J. G. Messchendorp , J. Min , T. J. Min , R. E. Mitchell , X. H. Mo , N. Yu. Muchnoi , Y. Nefedov , I. B. Nikolaev , Z. Ning , S. L. Olsen , Q. Ouyang , S. P. Pacettic , J. W. Park , M. Pelizaeus , K. Peters , J. L. Ping , R. G. Ping , R. Poling , C. S. J. Pun , M. Qi , S. Qian , C. F. Qiao , X. S. Qin , J. F. Qiu , K. H. Rashid , G. Rong , X. D. Ruan , A. Sarantsevd , J. Schulze , M. Shao , C. P. Shene , X. Y. Shen , H. Y. Sheng , M. R. Shepherd , X. Y. Song , S. Spataro , B. Spruck , D. H. Sun , G. X. Sun , J. F. Sun , S. S. Sun , X. D. Sun , Y. J. Sun , Y. Z. Sun , Z. J. Sun , Z. T. Sun , C. J. Tang , X. Tang , E. H. Thorndike , H. L. Tian , D. Toth , G. S. Varner , B. Wang , B. Q. Wang , K. Wang , L. L. Wang , L. L. Wang , L. S. Wang , M. Wang , P. Wang , P. L. Wang , Q. Wang , Q. J. Wang , S. G. Wang , X. F. Wang , X. L. Wang , Y. D. Wang , Y. F. Wang , Y. Q. Wang , Z. Wang , Z. G. Wang , Z. Y. Wang , D. H. Wei , Q. G. Wen , S. P. Wen , U. Wiedner , L. H. Wu , N. Wu , W. Wu , Z. Wu , Z. J. Xiao , Y. G. Xie , Q. L. Xiu , G. F. Xu , G. M. Xu , H. Xu , Q. J. Xu , X. P. Xu , Y. Xu , Z. R. Xu , Z. Xue , L. Yan , W. B. Yan , Y. H. Yan , H. X. Yang , T. Yang , Y. Yang , Y. X. Yang , H. Ye , M. Ye , M. H. Ye , B. X. Yu , C. X. Yu , S. P. Yu , C. Z. Yuan , W. L. Yuan , Y. Yuan , A. A. Zafar , A. Z. Zallo , Y. Zeng , B. X. Zhang , B. Y. Zhang , C. C. Zhang , D. H. Zhang , H. H. Zhang , H. Y. Zhang , J. Zhang , J. Q. Zhang , J. W. Zhang , J. Y. Zhang , J. Z. Zhang , L. Zhang , S. H. Zhang , T. R. Zhang , X. J. Zhang , X. Y. Zhang , Y. Zhang , Y. H. Zhang , Y. S. Zhang , Z. P. Zhang , Z. Y. Zhang , G. Zhao , H. S. Zhao , Jingwei Zhao , Lei Zhao , Ling Zhao , M. G. Zhao , Q. Zhao , S. J. Zhao , T. C. Zhao , X. H. Zhao , Y. B. Zhao , Z. G. Zhao , A. Zhemchugova , B. Zheng , J. P. Zheng , Y. H. Zheng , Z. P. Zheng , B. Zhong , J. Zhong , L. Zhou , X. K. Zhou , X. R. Zhou , C. Zhu , K. Zhu , K. J. Zhu , S. H. Zhu , X. L. Zhu , X. W. Zhu , Y. S. Zhu , Z. A. Zhu , J. Zhuang , B. S. Zou , J. H. Zou , J. X. Zuo

Search for eta_b in two-photon collisions at LEP II with the DELPHI detector

The pseudoscalar meson eta_b has been searched for in two-photon interactions at LEP II. The data sample corresponds to a total integrated luminosity of 617 pb^{-1} at centre-of-mass energies ranging from 161 to 209 GeV. Upper limits at a…

High Energy Physics - Experiment · Physics 2008-11-26 The DELPHI Collaboration , J. Abdallah

Meson--photon transition form factors and resonance cross-sections in e^+ e^- collisions

Meson--photon--photon transition form factors for S-, P-, and D-wave states are calculated, the meson being treated as a non-relativistic heavy-quark--antiquark pair. The full dependence on both photon virtualities is included.…

High Energy Physics - Phenomenology · Physics 2009-10-30 G. A. Schuler , F. A. Berends , R. van Gulik

Photon-meson transition form factors of light pseudoscalar mesons

The photon-meson transition form factors of light pseudoscalar mesons $\pi ^{0}$, $\eta$, and $\eta ^{\prime}$ are systematically calculated in a light-cone framework, which is applicable as a light-cone quark model at low $Q^{2}$ and is…

High Energy Physics - Phenomenology · Physics 2009-11-11 Bo-Wen Xiao , Bo-Qiang Ma

Measurement of the eta and etaprime transition form factors at q^2=112 GeV^2

We report a study of the processes e+e- -> eta gamma and e+e- -> etaprime gamma at a center-of-mass energy of 10.58 GeV, using a 232 fb^-1 data sample collected with the BABAR detector at the PEP-II collider at SLAC. We observe 20+6-5 eta…

High Energy Physics - Experiment · Physics 2010-03-19 The BABAR Collaboration , B. Aubert

Meson-Photon Transition Form Factors

We report results on the $\pi$-$\gamma$ transition form factor obtained within the hard scattering approach including transverse momentum effects and Sudakov corrections. The results clearly favor distribution amplitudes close to the…

High Energy Physics - Phenomenology · Physics 2009-09-25 R. Jakob , P. Kroll , M. Raulfs