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ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (16 download)
Download or read book Precision Measurement of the E+e- \to K+K-? Cross Section with the Initial-State Radiation Method at BaBar written by and published by . This book was released on 2013 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (16 download)
Download or read book Precise Measurement of the E+ E- \to Pi+ Pi-? Cross Section with the Initial-State Radiation Method at BABAR. written by and published by . This book was released on 2013 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the E+ E- to Pi+ Pi- Pi+ Pi-, K+ K- Pi+ Pi-, K+ K- K+ K- Cross Sections Using Initial State Radiation at BaBar written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: First results of a study of the ee− → ?+?−?+?−? process with hard photon emitted from initial state are presented. About 60000 fully reconstructed events have been selected based on 89.3 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective collision c.m. energy, and so BABAR ISR data can be compared to the relevant direct e+e− measurements. From obtained 4? mass spectrum we evaluate e+e− → ?+?−?+?− cross section for the range of c.m.s. energy from 0.6 to 4.5 GeV. The systematic error of the cross section measurement is 5% and comparable with the best e+e− data. The cross sections for identified 2K2? and 4K final states also have been presented.
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ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (16 download)
Download or read book Measurements of E+e- to KKeta, KKpi0 and KsKpi CrossSections Using Initial State Radiation Events written by and published by . This book was released on 2007 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reports measurements of processes: ee− →?K°{sub s}K{sup {+-}}?{sup {+-}}, e+e− →?K+K−?°, e+e− →??? and e+e− →???°. The initial state radiated photon allows to cover the hadronic final state in the energy range from thresholds up to ≈ 4.6 GeV. The overall size of the data sample analyzed is 232 fb−1, collected by the BABAR detector running at the PEP-II e+e− storage ring. From the Dalitz plot analysis of the K°{sub s}K{sup {+-}}?{sup {+-}} final state, moduli and relative phase of the isoscalar and the isovector components of the e+e− → KK*(892) cross section are determined. Parameters of? and? recurrences are also measured, using a global fitting procedure which exploits the interconnection among amplitudes, moduli and phases of the e+e− →K°{sub s}K{sup {+-}}?{sup {+-}}, K+K−?°,?? final states. The cross section for the OZI-forbidden process e+e− →??° and the J/? branching fractions to KK*(892) and K+K−? are also measured.
Author : Nicolas Berger
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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (316 download)
Download or read book Studies of $e^+e^-$ Collisions with a Hard Initial-State Photon at BaBar written by Nicolas Berger and published by . This book was released on 2005 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present preliminary BaBar measurements of hadronic cross sections in e{sup +}e{sup -} annihilation using the radiative return technique. The cross sections for e{sup +}e{sup -} {yields} p{bar p}, 3({pi}{sup +}{pi}{sup -}), 2({pi}{sup +}{pi}{sup -})2{pi}{sup 0}, and K{sup +}K{sup -}2({pi}{sup +}{pi}{sup -}) are measured. Measurements of the proton form factor and of the ratio G{sub E}/G{sub M} are also shown.
![Download Initial-State Radiation Measurement of the E+e- -] Pi+pi-pi+pi- Cross Section PDF Online Free](https://books.google.com/books/content/images/frontcover/6b2RwgEACAAJ?fife=w200-h370)
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ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (16 download)
Download or read book Initial-State Radiation Measurement of the E+e- -] Pi+pi-pi+pi- Cross Section written by and published by . This book was released on 2013 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (16 download)
Download or read book Measurement of the E+e-{u2192}?+?- Cross Section Between 600 and 900 MeV Using Initial State Radiation written by and published by . This book was released on 2015 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: We extract the e+e-→?+?- cross section in the energy range between 600 and 900 MeV, exploiting the method of initial state radiation. A data set with an integrated luminosity of 2.93 fb-1 taken at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider is used. The cross section is measured with a systematic uncertainty of 0.9%. We extract the pion form factor.
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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (727 download)
Download or read book Measurement of the E+ E- Multihadronic Cross Sections Below 4.5-GeV with BaBar written by and published by . This book was released on 2007 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a summary of the hadronic cross section measurements performed with BABAR at the PEP-II collider via radiative return. BABAR has performed measurements of exclusive final states containing 3, 4 and 6 hadrons via this complementary method, as well as a measurement of the proton form factor.
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ISBN 13 :
Total Pages : 35 pages
Book Rating : 4.:/5 (16 download)
Download or read book Cross Sections for the Reactions E+e to K+ K- Pi+pi-, K+ K- Pi0pi0, and K+ K- K+ K- Measured Using Initial-State Radiation written by and published by . This book was released on 2011 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the processes ee− 2!K+K−?+?-?, K+K−?°?°?, and K+K−K+K−?, where the photon is radiated from the initial state. About 84000, 8000, and 4200 fully reconstructed events, respectively, are selected from 454 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the e+e− center-of-mass energy, so that the K+K−?+?−? data can be compared with direct measurements of the e+e− 2!K+K−?+?− reaction. No direct measurements exist for the e+e− 2!K+K−?°?° or e+e− 2!K+K−K+K− reactions, and we present an update of our previous result with doubled statistics. Studying the structure of these events, we find contributions from a number of intermediate states, and extract their cross sections. In particular, we perform a more detailed study of the e+e− 2!?(1020)??? reaction, and confirm the presence of the Y (2175) resonance in the?(1020)f0(980) and K+K− f0(980) modes. In the charmonium region, we observe the J/? in all three final states and in several intermediate states, as well as the?(2S) in some modes, and measure the corresponding branching fractions.
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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (893 download)
Download or read book Measurement of the E^+e^-\to B\bar{b} Cross Section Between \SqrtS written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report ee− 2!b{bar b} cross section measurements by the BABAR experiment performed during an energy scan in the range of 10.54 to 11.20 GeV at the PEP-II ee− collider. A total relative error of about 5% is reached in more than three hundred center-of-mass energy steps, separated by about 5MeV. These measurements can be used to derive precise information on the parameters of the [Upsilon](10860) and [Upsilon](11020) resonances. In particular we show that their widths may be smaller than previously measured.
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ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (16 download)
Download or read book ISR Physics at BaBar written by and published by . This book was released on 2012 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method of measuring ee− annihilation cross sections at low energy √s
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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (873 download)
Download or read book E+ E- to Hadrons Cross-Sections at BaBar written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an overview of cross-section measurements at BABAR. In e{sup {+-}} → few-body processes at a center-of-mass energy E{sub CM} = 10.6 GeV we make new QCD tests and the first observation of two-virtual-photon annihilations into hadrons. Studies at lower √s, using radiative return, yield new/improved data on spectroscopy, form factors and the total hadronic cross section, an important input to calculations of g{sub {mu}}-2 and [alpha](M{sub Z}). We also present an inclusive measurement of the running of [alpha].
Author : Li Ye
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ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (15 download)
Download or read book Measurement of Compton Scattering Cross Section at a Few GeV Electron Energy written by Li Ye and published by . This book was released on 2018 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron Compton scattering is the best known fundamental QED process, however, a precision measurement of its cross section for a beam energy above 1 GeV has been lacking up to now. An updated high precision measurement of the neutral pion lifetime via the Primakoff effect (PrimEx-II) experiment was performed in Hall B of Jefferson Lab in 2010. The experiment used small angle coherent photoproduction of [Pi] 0 's in the Coulomb field of a nucleus, i.e. the Primakoff effect, to determine the lifetime with a precision of less than 1.5% . It therefore requires thorough understanding of the underlying systematic uncertainties. To facilitate that data for well known electromagnetic processes were taken concurrently with the photoproduction data. This analysis pertains to measuring the Compton scattering cross section, which occurs with similar kinematics to the primary process. The combination of the well established theory for this process with large collected statistics allowed to extract this cross section with high precision in an energy region of 4-5 GeV for 12C and 28Si targets. The results of this analysis will be presented.
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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (684 download)
Download or read book Precision Measurements of 56Fe Cross Sections for the 847-keV Gamma Transition written by and published by . This book was released on 1997 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the First Research Coordination Meeting of the IAEA/NDS CRP on Measurement, Calculation and Evaluation of Photon Production Data an experiment to measure with high precision the cross sections of the production of the 847-keV gamma ray due to inelastic neutron scattering with iron was proposed and discussed. The main justification for the proposed improved precision was the need for improved calculations of radiation transport through thick iron components of nuclear reactors. Present evaluated data for the subject reaction in the ENDF/B-VI files have evaluated uncertainties (almost equal to) 10%; consequently, the results of computation of deep penetration of radiation in iron can have quite large uncertainties -- larger than 100%, for example, for an attenuation of (approximately) three orders of magnitude -- which can be a serious problem when one considers the magnitude of the radiation field inside a pressure vessel. This report describes progress toward obtaining more precise data. 13 refs., 1 fig.
![Download The E^+e^- -] 3(\pi^+\pi^- ), 2(\pi^+\pi^-\pi^0) and K^+K^-2(\pi^+\pi^- ) Cross Sections at Center-of-Mass Energies 0.5--4.5 GeV Measured with Initial-StateRadiation PDF Online Free](https://books.google.com/books/content/images/frontcover/79vjjwEACAAJ?fife=w200-h370)
Author : B. Aubert
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ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (316 download)
Download or read book The E^+e^- -] 3(\pi^+\pi^- ), 2(\pi^+\pi^-\pi^0) and K^+K^-2(\pi^+\pi^- ) Cross Sections at Center-of-Mass Energies 0.5--4.5 GeV Measured with Initial-StateRadiation written by B. Aubert and published by . This book was released on 2006 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the processes e{sup +}e{sup -} {yields} 3({pi}{sup +}{pi}{sup -}){gamma}, 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}){gamma} and K{sup +}K{sup -} 2({pi}{sup +} {sup -}){gamma}, with the photon radiated from the initial state. About 20,000, 33,000 and 4,000 fully reconstructed events, respectively, have been selected from 232 fb{sup -1} of BABAR data. The invariant mass of the hadronic final state defines the effective e{sup +}e{sup -} center-of-mass energy, so that these data can be compared with the corresponding direct e{sup +}e{sup -} measurements. From the 3({pi}{sup +}{pi}{sup -}), 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and K{sup +}K{sup -} 2({pi}{sup +}{pi}{sup -}) mass spectra, the cross sections for the processes e{sup +}e{sup -} {yields} 3({pi}{sup +}{sup -}), e{sup +}e{sup -} {yields} 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and e{sup +}e{sup -} {yields} K{sup +}K{sup -} 2({pi}{sup +}{pi}{sup -}) are measured for center-of-mass energies from production threshold to 4.5 GeV. The uncertainty in the cross section measurement is typically 6-15%. We observe the J/{psi} in all these final states and measure the corresponding branching fractions.
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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (925 download)
Download or read book Measurement of Hadronic Cross Sections at BABAR with ISR and Implications for the Muon (g-2). written by and published by . This book was released on 2014 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (685 download)
Download or read book A Precision Measurement of the Prompt Photon Cross Section in P{bar P} Collisions at (square Root)s written by and published by . This book was released on 1994 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: A prompt photon cross section measurement from the CDF experiment at the Fermilab p{bar p} Collider is presented Detector and trigger upgrades, as well as six times the integrated luminosity compared with our previous publication, have contributed to a much more precise measurement and extended P{sub T} range. As before, the cross section agrees qualitatively with QCD calculations but has a steeper slope at low P{sub T}.
