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排序方式: 共有88条查询结果,搜索用时 15 毫秒
1.
V. V. Anisovich B. Ch. Metsch H. R. Petry A. V. Sarantsev 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(4):417-433
We investigate a special concept of quarkhadron duality in meson physics at low and intermediate energies. With a relativistic propagator for confined quarks, we calculated masses and widths of the mesons which areS- andP-wave states ofq¯q (J P=0?, 1?, 0+, 1+c, 2+) as well as meson-meson scattering amplitudes at energies up totrs ≤ 1.3 GeV by including light pseudoscalar and vector mesons into the interaction dynamics. Our investigation shows that the influence of the light meson dynamics resutls in:
- a contribution to the constituent quark mass of approximately 200 MeV.
- the appearance of a new soft confinement force barrier responsible for the formation of the highly excited meson states.
2.
Bartholomy O Credé V van Pee H Anisovich AV Anton G Bantes R Beloglazov Y Bogendörfer R Castelijns R Ehmanns A Ernst J Fabry I Flemming H Fösel A Freiesleben H Fuchs M Funke Ch Gothe R Gridnev A Gutz E Höffgen SK Horn I Hössl J Joosten R Junkersfeld J Kalinowsky H Klein F Klempt E Koch H Konrad M Kopf B Krusche B Langheinrich J Löhner H Lopatin I Lotz J Matthäy H Menze D Messchendorp J Morales C Novinski D Ostrick M Radkov A Reinnarth J Sarantsev AV Schadmand S Schmidt Ch Schmieden H Schoch B 《Physical review letters》2005,94(1):012003
Single pi(0) photoproduction has been studied with the CB-ELSA experiment at Bonn using tagged photon energies between 0.3 and 3.0 GeV. The experimental setup covers a very large solid angle of approximately 98% of 4pi. Differential cross sections dsigma/dOmega have been measured. Complicated structures in the angular distributions indicate a variety of different resonances being produced in the s channel intermediate state gammap-->N(*)(Delta(*))-->ppi(0). A combined analysis including the data presented in this letter along with other data sets reveals contributions from known resonances and evidence for a new resonance N(2070)D15. 相似文献
3.
Partial wave analysis of the reactions $p\bar p \to \pi \pi ,\eta \eta ,\eta \eta '$ in the region of invariant masses 1900–2400 MeV indicates the existence of four relatively narrow tensor-isoscalar resonances ? 2(1920), ? 2(2020), ? 2(2240), ? 2(2300), as well as the broad state ? 2(2000). The determined decay couplings of the broad resonance ? 2(2000) → π0π0, ηη, ηη′ satisfy the relations appropriate to those of a tensor glueball, while the couplings of other tensor states do not, thus verifying the glueball nature of ? 2(2000). 相似文献
4.
Quark-antiquark composite systems: The Bethe-Salpeter equation in the spectral-integration technique
A. V. Anisovich V. V. Anisovich V. N. Markov M. A. Matveev A. V. Sarantsev 《Physics of Atomic Nuclei》2004,67(4):773-803
The Bethe-Salpeter equations for the quark-antiquark composite systems, q\(\bar q\), are written in terms of spectral integrals. For the q\(\bar q\) mesons characterized by the mass M, spin J, and radial quantum number n, the equations are presented for the following (n, M2) trajectories: π J , η J , a J , f J , ρ J , ω J , h J , and b J . 相似文献
5.
A. V. Anisovich E. Klempt V. A. Nikonov A. V. Sarantsev U. Thoma 《The European Physical Journal A - Hadrons and Nuclei》2011,47(2):27
We report evidence for N(1710)P
11 , N(1875)P
11 , N(1900)P
13 , D \Delta(1600)P
33 , D \Delta(1910)P
31 , and D \Delta(1920)P
33 , and find indications that N(1900)P
13 might have a companion state at 1970MeV. The controversial D \Delta(1750)P
31 is not seen. The evidence is derived from a study of data on pion- and photo-induced hyperon production, but other data are
included as well. Most of the resonances reported here were found in the Karlsruhe-Helsinki (KH84) and the Carnegie-Mellon
(CM) analyses but were challenged recently by the Data Analysis Center at GWU. Our analysis is constrained by the energy-independent
p \pi
N scattering amplitudes from either KH84 or GWU. The two p \pi
N amplitudes from KH84 or GWU, respectively, lead to slightly different p \pi
N branching ratios of contributing resonances but the debated resonances are required in both series of fits. 相似文献
6.
Andrey Sarantsev 《Journal of Theoretical Probability》2017,30(3):1200-1223
Consider a multidimensional obliquely reflected Brownian motion in the positive orthant, or, more generally, in a convex polyhedral cone. We find sufficient conditions for existence of a stationary distribution and convergence to this distribution at an exponential rate, as time goes to infinity, complementing the results of Dupuis and Williams (Ann Probab 22(2):680–702, 1994) and Atar et al. (Ann Probab 29(2):979–1000, 2001). We also prove that certain exponential moments for this distribution are finite, thus providing a tail estimate for this distribution. Finally, we apply these results to systems of rank-based competing Brownian particles, introduced in Banner et al. (Ann Appl Probab 15(4):2296–2330, 2005). 相似文献
7.
A. V. Anisovich A. V. Sarantsev 《The European Physical Journal A - Hadrons and Nuclei》2006,30(2):427-441
The cross-sections for photo- and pion-induced production of baryon resonances and their partial decay widths to the two-body
and multi-body final states are calculated in the framework of the operator expansion method. The approach is fully relativistic
invariant, and it allows us to perform combined analyses of different reactions imposing directly the analyticity and unitarity
constraints. All formulae are given explicitly in the form used by the Crystal Barrel Collaboration in the partial-wave analysis. 相似文献
8.
9.
10.
A. V. Anisovich V. V. Anisovich M. A. Matveev V. A. Nikonov J. Nyiri A. V. Sarantsev 《Physics of Atomic Nuclei》2010,73(7):1254-1265
We consider as an example the two-pion decay of the ρ meson, the 3
S
1
q
$
\bar q
$
\bar q
state of the constituent quarks—the decay being determined by the transition q
$
\bar q
$
\bar q
→ ππ contains information about confinement interactions. One can specify in this decay two types of transitions: (i) the bremsstrahlung
radiation of a pion q → q + π (or $
\bar q
$
\bar q
→ $
\bar q
$
\bar q
+ π) with a subsequent fusion q
$
\bar q
$
\bar q
→ π, and (ii) the direct transition q
$
\bar q
$
\bar q
→ ππ. We demonstrate how in the amplitudes of the corresponding transitions the quark singularities have to disappear, i.e., what
is the way the quark confinement at relatively short distances can be realized. We calculate and estimate the contributions
of processes with bremsstrahlung radiation of the pion and of the direct transition q
$
\bar q
$
\bar q
→ ππ. The estimates demonstrate that the processes involving the direct transition q
$
\bar q
$
\bar q
→ ππ are necessary, but they cannot be determined unambiguously by the decay ρ(775) → ππ. We conclude that for the determination of the q
$
\bar q
$
\bar q
→ ππ transition more complete data on the resonance decays into the ππ channels are needed than those available at the moment. 相似文献