排序方式: 共有15条查询结果,搜索用时 78 毫秒
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C. Amsler F. H. Heinsius H. Koch B. Kopf U. Kurilla C. A. Meyer K. Peters J. Pychy M. Steinke U. Wiedner 《The European Physical Journal C - Particles and Fields》2015,75(3):124
The spin density matrix of the \(\omega \) has been determined for the reaction \({\bar{p}p}\,\rightarrow \,\omega \pi ^0\) with unpolarized in-flight data measured by the Crystal Barrel LEAR experiment at CERN. The two main decay modes of the \(\omega \) into \(\pi ^0 \gamma \) and \(\pi ^+ \pi ^- \pi ^0\) have been separately analyzed for various \({\bar{p}}\)momenta between 600 and 1940 MeV/c. The results obtained with the usual method by extracting the matrix elements via the \(\omega \) decay angular distributions and with the more sophisticated method via a full partial wave analysis are in good agreement. A strong spin alignment of the \(\omega \) is clearly visible in this energy regime and all individual spin density matrix elements exhibit an oscillatory dependence on the production angle. In addition, the largest contributing orbital angular momentum of the \({\bar{p}p~}\)system has been identified for the different beam momenta. It increases from \(L^{max}_{{\bar{p}p~}}\) \(=\) 2 at 600 MeV/c to \(L^{max}_{{\bar{p}p~}}\) \(=\) 5 at 1940 MeV/c. 相似文献
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Marsiske H Antreasyan D Bartels HW Besset D Bieler C Bienlein JK Bizzeti A Bloom ED Brock I Brockmüller K Cabenda R Cartacci A Cavalli-Sforza M Clare R Compagnucci A Conforto G Cooper S Cowan R Coyne D Engler A Fairfield K Folger G Fridman A Gaiser D Gelphman D Glaser G Godfrey G Graaf K Heimlich FH Heinsius FH Hofstadter R Irion J Jakubowski Z Janssen H Karch K Keh S Kiel T Kilian H Kirkbride I Kloiber T Kobel M Koch W König AC Königsmann K Kraemer RW Krüger S Landi G Lee R Leffler S 《Physical review D: Particles and fields》1990,41(11):3324-3335
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Zioutas K Andriamonje S Arsov V Aune S Autiero D Avignone FT Barth K Belov A Beltrán B Bräuninger H Carmona JM Cebrián S Chesi E Collar JI Creswick R Dafni T Davenport M Di Lella L Eleftheriadis C Englhauser J Fanourakis G Farach H Ferrer E Fischer H Franz J Friedrich P Geralis T Giomataris I Gninenko S Goloubev N Hasinoff MD Heinsius FH Hoffmann DH Irastorza IG Jacoby J Kang D Königsmann K Kotthaus R Krcmar M Kousouris K Kuster M Lakić B Lasseur C Liolios A Ljubicić A Lutz G Luzón G Miller DW 《Physical review letters》2005,94(12):121301
Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by the Primakoff process. In a laboratory magnetic field ("axion helioscope"), they would be transformed into x-rays with energies of a few keV. Using a decommissioned Large Hadron Collider test magnet, the CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from the analysis of these data are presented here. No signal above background was observed, implying an upper limit to the axion-photon coupling g(agamma)<1.16x10(-10) GeV-1 at 95% C.L. for m(a) less, similar 0.02 eV. This limit, assumption-free, is comparable to the limit from stellar energy-loss arguments and considerably more restrictive than any previous experiment over a broad range of axion masses. 相似文献
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Oligomeric ferrocenes were investigated simultaneously by matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOFMS). The oligomers were obtained by the reaction of tetrahydro-4,4,8,8-tetramethyl-4,8-disila-s-indacene-3a,7a-diyldilithium (Li(2)L) with FeCl(2).1.5 THF (THF = tetrahydrofuran). Depending on the reaction conditions up to ten linear-chain and eleven cyclic ferrocene oligomers with masses between 1139 and 5071 Da could be detected unambiguously. The most abundant macrocycles contained ten and seven iron atoms when the reactions were carried out at -20 and 25 degrees C, respectively. The chains had cyclopentadienes as end groups and formally resulted from replacing one iron of a cycle by two hydrogens, which corresponds to a mass difference of 54 Da. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
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C. Amsler A. V. Anisovich C. A. Baker B. M. Barnett C. J. Batty P. Blüm K. Braune V. Credé K. M. Crowe M. Doser W. Dünnweber D. Engelhardt M. A. Faessler R. P. Haddock F. H. Heinsius N. P. Hessey H. Kalinowsky D. Jamnik P. Kammel J. Kisiel E. Klempt H. Koch M. Kunze U. Kurilla R. Landua H. Matthäy C. A. Meyer F. Meyer-Wildhagen R. Ouared K. Peters B. Pick M. Ratajczak C. Regenfus J. Reinnarth A. V. Sarantsev U. Strohbusch M. Suffert J. S. Suh U. Thoma S. Wallis-Plachner D. Walther U. Wiedner 《The European Physical Journal C - Particles and Fields》2004,33(1):23-30
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M. Daum M. Finger M. Finger Jr. J. Franz F.H. Heinsius A. Janata K. Königsmann H. Lacker F. Lehar H. Schmitt W. Schweiger P. Sereni M. Slunečka 《The European Physical Journal C - Particles and Fields》2007,52(1):253-253
Due to a coding error, the previous paper quoted incorrect values for the differential cross sections dσ/dMpp and dσ/dΩπ
* of the process np→ppπ-.
The online version of the original article can be found at 相似文献
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M. Daum M. Finger M. Finger Jr. J. Franz F.H. Heinsius A. Janata K. K?nigsmann H. Lacker F. Lehar H. Schmitt W. Schweiger P. Sereni M. Sluneka 《The European Physical Journal C - Particles and Fields》2007,52(1):253
Due to a coding error, the previous paper quoted incorrect values for the differential cross sections dσ/dMpp and dσ/dΩπ
* of the process np→ppπ-.
The online version of the original article can be found at 相似文献