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141.
D. Babusci H. Czy? F. Gonnella S. Ivashyn M. Mascolo R. Messi D. Moricciani A. Nyffeler G. Venanzoni KLOE-?Collaboration 《The European Physical Journal C - Particles and Fields》2012,72(3):1917
A possibility of KLOE-2 experiment to measure the width
\varGammap0 ?gg\varGamma_{\pi^{0} \to\gamma\gamma} and the π
0
γγ
∗ form factor F(Q
2) at low invariant masses of the virtual photon in the space-like region is considered. This measurement is an important test
of the strong interaction dynamics at low energies. The feasibility is estimated on the basis of a Monte-Carlo simulation.
The expected accuracy for
\varGammap0 ?gg\varGamma_{\pi^{0} \to\gamma\gamma} is at a per cent level, which is better than the current experimental world average and theory. The form factor will be measured
for the first time at Q
2≤0.1 GeV2 in the space-like region. The impact of these measurements on the accuracy of the pion-exchange contribution to the hadronic
light-by-light scattering part of the anomalous magnetic moment of the muon is also discussed. 相似文献
142.
G. Abbiendi et al. The OPAL Collaboration 《The European Physical Journal C - Particles and Fields》2001,20(3):445-454
A sample of 3.73 million hadronic Z decays, recorded with the OPAL detector at LEP in the years 1991–95, has been used to
search for a narrow resonance corresponding to the decay of the meson into . The mesons are reconstructed in the decay channel with . No evidence for a narrow resonance is found. A limit on the production of narrow in hadronic Z decays is derived:
Received: 16 January 2001 / Published online: 28 May 2001 相似文献
143.
BES Collaboration 《中国物理C(英文版)》2002,26(11):1093-1102
We report the results of a search for the semileptonic decays D+→e+ν,D+→K-π+e+ν,D0→K-e+ν and D0→K-μ+ν using the BES detector at the BEPC e+e- Collider. Using a data sample of 22.3pb-1 collected at the center of mass energy s=4.03GeV, we select 2472±87D 0 tag DX and 7628±149D 0 tag DX singly tagged D events, where the X could be γ, π 0 and/or π±. Based on the method of "combined D+and D0 single and double tags", we determine that 2471±218 D+X and 7629±251 D0 X are contained in the recoil side of the singly tagged neutral and charged D mesons, respectively. No events for the 4 semileptonic decay modes are observed in the recoil side of the tagged D mesons. The 90% confidence level upper limits of B(D+→e+ν)<1.38%,B(D+→K-π+e+ν)<2.01%,B(D0→K-e+ν)<0.53% and B(D0→K-μ+ν)<0.53% are determined from the search for the semileptonic decays of D+ and D0. 相似文献
144.
M. Asai J. L. Bailly S. Banerjee F. Bruyant W. M. Bugg C. Caso H. Dibon R. Di Marco T. Emura B. Epp A. Ferrando Y. Fisyak F. Fontanelli P. Girtler A. Gurtu R. Hamatsu E. L. Hart P. Herquet J. Hrubec Y. Iga N. Khalatjan E. Kistenev P. Ladron de Guevara J. MacNaughton J. C. Marin M. Markytan I. S. Mittra L. Montanet G. Neuhofer N. Ohshima Y. Petrovikh P. Porth B. Pijlgroms M. Regler T. Rodrigo J. Saliclo J. B. Singh S. Squarcia P. Stamer V. Stopchenko U. Trevisan C. Willmott G. Zholobov EHS-RCBC Collaboration 《Zeitschrift fur Physik C Particles and Fields》1985,27(1):11-19
145.
B. Bassalleck P. Braun-Munzinger W. Cleland G. David A. Farooq M. Fatyga A. Gavron V. Greene J. Hall R. Heifetz M. Herman H. Kent D. Kraus D. Lissauer W. Llope T. Ludlam Z. Moroz E. O'Brien L. Olsen D. Sarantites T. Semkow B. Shivakumar J. E. Simon J. Stachel H. Takai T. Throwe L. Waters J. Wojtkowska K. Wolf D. Wolfe E Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,38(1):45-49
Transverse energy distributions have been measured for collisions of 10 GeV/nucleon Si with targets of Al, Cu and Pb using a combination of a NaI wall and a uranium based sampling calorimeter. The measured cross sectionsdσ/dE T anddE T /dη are consistent with full stopping and an increase, with increasing values ofE T , of energy flow into large angles. 相似文献
146.
R. Eder C. J. Ashworth I. Berkes D. E. Brown U. Daemmrich I. S. Grant A. G. Griffiths E. Hagn R. Hassani P. Herzog S. Ohya M. Massaq C. Richard-Serre J. Rikovska K. Schloesser N. Severijns N. J. Stone W. Vanderpoorten J. Vanhaverbeke L. Vanneste T. Woelfle E. Zech Isolde Collaboration 《Hyperfine Interactions》1988,43(1-4):469-472
Nuclear orientation and nuclear magnetic resonance experiments were performed on185, 187, 189Pt isotopes oriented in Fe and single crystal Zn at temperatures down to about 6 mK. The hyperfine splitting frequencies of185Pt and187Pt in iron were determined to be 164.9(2) and 261.1(2) MHz, respectively. With the hyperfine field of −126.1(2.5) T, the g-factors
are deduced to be |g(185Pt)|=0.172(3) and |g(187Pt)|=0.272(5).
The spectroscopic quadrupole moment of187Pt was found to be negative with magnitude similar to that of189Pt, indicating a predominantly oblate ground state deformation for both isotopes. The spectroscopic quadrupole moment of185Pt was found to be positive, with the ratio Q(185Pt)/Q(189Pt)=−3.6(9), clearly indicating a change to prolate ground state deformation. 相似文献
147.
B. Betev J. J. Blaising P. Bordalo A. Boumediene L. Cerrito A. Degré A. Ereditato S. Falciano K. Freudenreich E. Gorini M. Guanziroli H. Hofer P. Juillot L. Kluberg P. Lecomte P. Le Coultre R. Morand B. Mours A. Romana R. Salmeron P. Strolin H. Suter V. L. Telegdi J. Varela G. Viertel J. Wallace-Hadrill M. Winter NA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1985,28(1):15-22
148.
D. Allasia C. Angelini A. Baldini L. Bertanza F. Bianchi A. Bigi F. Bobisut A. Borg P. Capiluppi R. Cirio J. Derkaoui M. L. Faccini-Turluer A. G. Frodesen D. Gamba G. Giacomelli B. Jongejans G. Mandrioli A. Margiotta-Neri A. Marzari-Chiesa R. Pazzi L. Patrizii C. Petri F. Predieri A. Romero A. M. Rossi A. Sconza P. Serra-Lugaresi M. Spurio A. G. Tenner G. W. van Apeldoorn P. H. A. van Dam N. A. M. van Eijndoven D. Vignaud WA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1988,37(4):527-533
Bose-Einstein correlations between pions of equal charge have been observed in Charged Current and Neutral Current (anti)neutrino-deuterium interactions in the BEBC bubble chamber exposed to the SPS wide band beam. The pion emission region is found to be essentially spherical with a mean radius of (0.48±0.07) fm; the chaoticity parameter is 0.36±0.04. 相似文献
149.
ZEUS Collaboration M. Derrick D. Krakauer S. Magill D. Mikunas B. Musgrave J. Repond R. Stanek R. L. Talaga H. Zhang et al. 《Zeitschrift fur Physik C Particles and Fields》1995,69(1):607-620
We report on a measurement of the proton structure functionF
2 in the range 3.5×10−5≤x≤4×10−3 and 1.5 GeV2≤Q
2≤15GeV2 at theep collider HERA operating at a centre-of-mass energy of √s=300GeV. The rise ofF
2 with decreasingx observed in the previous HERA measurements persists in this lowerx andQ
2 range. TheQ
2 evolution ofF
2, even at the lowestQ
2 andx measured, is consistent with perturbative QCD.
supported by EU HCM contract ERB-CHRX-CT93-0376 相似文献
150.
This review of low-p
T proton-proton physics at low luminosity at the large hadron collider (LHC) should cover all LHC experiments, but in practice,
is mainly related to ALICE, for reasons which will be explained. However, the relevance to other LHC experiments is clear,
as low-pT. phenomena represent an important component of the background to their high-pT. phenomena which needs to be calibrated. The ALICE collaboration will study proton-proton collisions as part of their heavy-ion
programme, where most signals are relative to the proton-proton system. In addition, the ALICE detector’s unique acceptance
at low pT as well as its unique particle identification capability will make it possible to carry out a program of genuine proton-proton
physics complementary to those of other LHC experiments. 相似文献