51,615 research outputs found
Considerations for an Ac Dipole for the LHC
Following successful experience at the BNL AGS, FNAL Tevatron, and CERN SPS,
an AC Dipole will be adopted at the LHC for rapid measurements of ring optics.
This paper describes some of the parameters of the AC dipole for the LHC,
scaling from performance of the FNAL and BNL devices.Comment: proceedings of the 2007 Particle Accelerator Conferenc
BNL Future Plans
I discuss the prospects for a fixed target physics program at the AGS in the
RHIC era.Comment: 18 pages, LaTeX, 12 Postscript figures. To be published in the
proceedings of the Workshop on Kaon, Muon, Neutrino Physics and Future, KEK,
31 Oct. - 1 Nov 199
Higgs Decay to Top Quarks at Hadron Colliders
Higgs bosons which decay principally to top quarks, such as in the minimal
supersymmetric model, produce a peak-dip structure in the
invariant-mass spectrum. This structure is potentially observable at the CERN
Large Hadron Collider. (see BNL theory home page
http://penguin.phy.bnl.gov/bnl.html for recent preprints)Comment: CPP-94-18, BNL-60339, ILL-(TH)-94-
Theoretical Status of Muon (g-2)
The theoretical status of the muon anomaly is reviewed including the recent
change in the light by light hadronic correction. Specific attention is given
to the implications of the shift in the difference between the BNL experimental
result and the standard model prediction for sparticle mass limits. The
implication of the BNL data for Yukawa unification is discussed and the role of
gaugino mass nonuniversalities in the satisfaction of Yukawa unification is
explored. An analysis of the BNL constraint for the satisfaction of the relic
density constraint and for the search for dark matter is also given.Comment: 9 pages, Latex aipproc.Invited plenary talk at the Coral Gables
Conference, at Fort Lauderdale, Florida, Dec 12-16, 2001. Vernon Hughes and
Alan Krisch, session organizer
Implications of BNL measurement of \delta a_{\mu} on scalar leptoquark mass and coupling
Recently BNL have measured the muon magnetic moment anomaly with increased
precision. The world average experimental value at present shows a discrepancy
of 43(16)\times 10^{-10} from the Standard Model value. In this paper we
investigate the implications of this difference on a class of scalar leptoquark
interactions to SM quark-lepton pair.
We find that for leptoquarks in the few hundred Gev range the BNL muon
anomaly could arise from leptoquark couplings that are much smaller than the
electromagnetic coupling.
We also find that the BNL value for the muon anomaly leads to an unambiguous
prediction for the electric dipole moment of the muon and a bound on the flavor
changing leptoquark coupling relevant for the rare decay \mu\to e\gamma.Comment: Few references adde
Power Spectrum Analysis of Physikalisch-Technische Bundesanstalt Decay-Rate Data: Evidence for Solar Rotational Modulation
Evidence for an anomalous annual periodicity in certain nuclear decay data
has led to speculation concerning a possible solar influence on nuclear
processes. We have recently analyzed data concerning the decay rates of Cl-36
and Si-32, acquired at the Brookhaven National Laboratory (BNL), to search for
evidence that might be indicative of a process involving solar rotation.
Smoothing of the power spectrum by weighted-running-mean analysis leads to a
significant peak at frequency 11.18/yr, which is lower than the equatorial
synodic rotation rates of the convection and radiative zones. This article
concerns measurements of the decay rates of Ra-226 acquired at the
Physikalisch-Technische Bundesanstalt (PTB) in Germany. We find that a similar
(but not identical) analysis yields a significant peak in the PTB dataset at
frequency 11.21/yr, and a peak in the BNL dataset at 11.25/yr. The change in
the BNL result is not significant since the uncertainties in the BNL and PTB
analyses are estimated to be 0.13/yr and 0.07/yr, respectively. Combining the
two running means by forming the joint power statistic leads to a highly
significant peak at frequency 11.23/yr. We comment briefly on the possible
implications of these results for solar physics and for particle physics.Comment: 15 pages, 13 figure
Analysis of environmental influences in nuclear half-life measurements exhibiting time-dependent decay rates
In a recent series of papers evidence has been presented for correlations
between solar activity and nuclear decay rates. This includes an apparent
correlation between Earth-Sun distance and data taken at Brookhaven National
Laboratory (BNL), and at the Physikalisch-Technische Bundesanstalt (PTB).
Although these correlations could arise from a direct interaction between the
decaying nuclei and some particles or fields emanating from the Sun, they could
also represent an "environmental" effect arising from a seasonal variation of
the sensitivities of the BNL and PTB detectors due to changes in temperature,
relative humidity, background radiation, etc. In this paper, we present a
detailed analysis of the responses of the detectors actually used in the BNL
and PTB experiments, and show that sensitivities to seasonal variations in the
respective detectors are likely too small to produce the observed fluctuations
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