摘要:

A full-sized water Cherenkov detector (WCD) prototype (cylinder 3.57mdiameter filled with purified water up to a height of 1.2m) was used to obtain experimental results that validate the concept of remote calibration and monitoring of WCDs based on the use of the natural flux of cosmic ray muons. Two types of events can be used to monitor and to calibrate each of the WCDs: through-going muons (i.e., isolated muons) and decay electrons from muons stopped inside each detector. The different triggers that will be used to obtain these events and the on-line calibration and monitoring histograms are discussed along with the way these data can be used to diagnose component failures of any of the surface stations of the Auger Observatory. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301390

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

For neutrinos with a magnetic moment, we calculate the production rate of right handed neutrinos in a hot and dense plasma via the quirality flip(&ngr;L→&ggr;*&ngr;R)and the plasmon decay(&ggr;*→&ngr;L&ngr;R)processes. The rate for these processes is computed in terms of a resummed photon propagator which consistently incorporates the background effects. Applying the results to the case of supernova collapse, our results can be used to place an upper limit on the neutrino magnetic moment&mgr;&ngr;<(0.1–0.4)×10−11&mgr;B.©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301391

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

We study dynamical mass generation for fermions in the Yukawa and the supersymmetric Wess-Zumino (WZ) models. It is found that above a critical coupling fermion mass can be generated dynamically in the Yukawa model, whereas in the WZ model the fermion does not acquire mass. We also show that the supersymmetry (SUSY) preserving solution is permitted and hence the scalars may not acquire mass either. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301392

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

We show that the presence of residual Bose-Einstein correlations may affect the non-resonant contribution of hadronic decays where two identical pions appear in the final state. The distortion of the phase-space of the reaction would be visible in the Dalitz plot. We discuss the decayK+→&pgr;−&pgr;+&pgr;+which contain two identical pions in the final state. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301393

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

We calculate the general static solutions of the scalar field equations for the potentialV(&fgr;)=−1/2M2&fgr;2+&lgr;/4&fgr;4for a finite domain in(1+1)dimensions. Solutions with vacuum-vacuum boundary conditions atx=±∞were firstly obtained by Dashen &etal; (DHN) [1]. We define expressions for the “topological charge”, “total energy” and “energy density” for general solutions in a finite domain. Also we calculate the quantum fluctuations and radiative corrections for general solutions. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301394

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

We review the idea of stretched horizon for extremal black holes in supersymmetric string theories, and we compute it for non-supersymmetric black holes in four dimensions. Only when the angular momentum is large is the stretched horizon bigger than the event horizon. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301395

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

Reanalyzing two inclusive&Lgr;0polarization data samples, created fromproton-nucleuscollisions, we found that&Lgr;0polarization is well described, in the average, byP(xF,PT)=(−0.450±0.018)xFPT+(0.060±0.007),with−1<xF<PT GeV/c.This function fits also&Lgr;¯0polarization created inpp¯→&Lgr;¯0Xreactions, and&Ygr;−polarization. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301396

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

We analyze the BRST field-antifield construction for generalized gauge fields consisting of massless mixed representations of the Lorentz Group and we calculate all the strictly gauge invariant interactions between them. All these interactions are higher derivative terms constructed out from the derivatives of the curl of the field strength. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301397

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

The bremsstrahlung in the region of the Dalitz plot that covers exclusively the four-body events of unpolarized semileptonic decays of charged and neutral hyperons is described by very accurate analytical expressions. These expressions contain a logarithmic singularity at the upper edge of the plot. We perform the analytical integration and obtain divergentless formulas for the energy spectrum of the produced charged lepton. With these formulas for the four body region and the analogous for the three body region, the whole spectrum of physically possible events are covered. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301398

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

We solve the one-loop Renormalization Group Equations (RGE) and show that each of the Quark Yukawa Couplings (QYC) matrices for the up and down quarks depends on two functions of energy. The energy dependence is such that the diagonalizing matrices of the up QYC and the ratiomc/muare constant while for the down QYC the diagonalizing matrices are energy dependent. From this it follows that the evolution of the CKM matrix depends on energy through one known function. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1301399

出版商:AIP    

年代:1999

数据来源: AIP