John D Barrow
John D Barrow
We investigate the consequences for the black hole area of introducing fractal structure for the horizon geometry. We create a three-dimensional spherical analogue of a 'Koch Snowflake' using a infinite diminishing hierarchy of touching sph...
S Pommé,H Stroh,J Paepen et al.
S Pommé et al.
The hypothesis that proximity to the Sun causes variation of decay constants at permille level has been tested and disproved. Repeated activity measurements of mono-radionuclide sources were performed over periods from 200 days up to four d...
Dmitri Melikhov,Berthold Stech
Dmitri Melikhov
The photon transition form factors of π, η and [Formula: see text] are discussed in view of recent measurements. It is shown that the exact axial anomaly sum rule allows a precise comparison of all three form factors at high-[Formula: see...
Measurements of the strong-interaction widths of the kaonic (3)He and (4)He 2p levels [0.03%]
关于kaon介导相互作用宽度的测量：氦3和氦4的2P能级
SIDDHARTA Collaboration;M Bazzi,G Beer,L Bombelli et al.
SIDDHARTA Collaboration;M Bazzi et al.
The kaonic (3)He and (4)He X-rays emitted in the [Formula: see text] transitions were measured in the SIDDHARTA experiment. The widths of the kaonic (3)He and (4)He 2p states were determined to be [Formula: see text], and [Formula: see text...
OPE, charm-quark mass, and decay constants of D and Ds mesons from QCD sum rules [0.03%]
QCD求和规则下的OPE、粲夸克质量及D和Ds介子的衰减常数
Wolfgang Lucha,Dmitri Melikhov,Silvano Simula
Wolfgang Lucha
We present a sum-rule extraction of the decay constants of the charmed mesons D and Ds from the two-point correlator of pseudoscalar currents. First, we compare the perturbative expansion for the correlator and the decay constant performed ...
S Friedreich,D Barna,F Caspers et al.
S Friedreich et al.
We report on the first experimental results for microwave spectroscopy of the hyperfine structure of p¯3He+. Due to the helium nuclear spin, p¯3He+ has a more complex hyperfine structure than p¯4He+, which has already been studied before...
Axel Maas
Axel Maas
Gauge fixing in the non-perturbative domain of non-Abelian gauge theories is obstructed by the Gribov-Singer ambiguity. To compare results from different methods it is necessary to resolve this ambiguity explicitly. Such a resolution is pro...
SIDDHARTA Collaboration;M Bazzi,G Beer,L Bombelli et al.
SIDDHARTA Collaboration;M Bazzi et al.
The first observation of the kaonic (3)He 3d→2p transition was made, using slow K- mesons stopped in a gaseous (3)He target. The kaonic atom X-rays were detected with large-area silicon drift detectors using the timing information of the K...
Search for projectile fragments with fractional charge in relativistic heavy ion collisions [0.03%]
相对论重离子碰撞中寻找分数电荷的射弹碎片
A Hoffmann,C Brechtmann,W Heinrich et al.
A Hoffmann et al.
We measured the charge of about 35000 projectile fragments with Z > or = 5e produced by 14.5 GeV/nucleon and 200 GeV/nucleon 16O beams in a Pb target using CR39 plastic nuclear track detectors. A minimum track length of 3 mm in the detector...
Proton-proton correlations at small relative momentum in neon-nucleus collisions at E/A=400 and 800 MeV [0.03%]
相对动量较小时氖核轰击靶核的正电子-正电子相关性
P Dupieux,J P Alard,J Augerat et al.
P Dupieux et al.
Proton-proton small angle correlations have been measured in neon-nucleus collisions, using the 4 pi detector Diogene, at 400 and 800 MeV per nucleon incident energies. Values of the size of the emitting region are obtained by comparison wi...
Comparative Study
Physics letters. [Part B]. 1988 Jan 7;200(1-2):17-21. DOI:10.1016/0370-2693(88)91101-x 1988