A higher precision measurement of the anomalous g value, a(mu)=(g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron, based on data collected in the year ...2000. The result a(mu(+))=11 659 204(7)(5)x10(-10) (0.7 ppm) is in good agreement with previous measurements and has an error about one-half that of the combined previous data. The present world average experimental value is a(mu)(expt)=11 659 203(8)x10(-10) (0.7 ppm).
A precise measurement of the anomalous g value, a(mu) = (g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron. The result a(mu+) = 11 659 202(14) (6) x ...10(-10) (1.3 ppm) is in good agreement with previous measurements and has an error one third that of the combined previous data. The current theoretical value from the standard model is a(mu)(SM) = 11 659 159.6(6.7) x 10(-10) (0.57 ppm) and a(mu)(exp) - a(mu)(SM) = 43(16) x 10(-10) in which a(mu)(exp) is the world average experimental value.
The spin precession frequency of muons stored in the (g-2) storage ring has been analyzed for evidence of Lorentz and CPT violation. Two Lorentz and CPT violation signatures were searched for a ...nonzero delta omega a(=omega a mu+ - omega a mu-) and a sidereal variation of omega a mu+/-). No significant effect is found, and the following limits on the standard-model extension parameters are obtained: bZ = -(1.0+/-1.1) x 10(-23) GeV; (m mu dZ0 + HXY)=(1.8+/-6.0) x 10(-23) GeV; and the 95% confidence level limits b perpendicular mu+ <1.4 x 10(-24) GeV and b perpendicular mu- <2.6 x 10(-24) GeV.
A Hall probe device has been built to measure the radial component of the magnetic field in the muon (g-2) storage ring at Brookhaven National Laboratory. The ultraprecise (g-2) magnet provides a ...dominantly vertical magnetic field of about
1.45
T
. In order to limit the vertical shift of the muon orbit, the average radial field component should be no more than 5×10
−5 of the vertical field. Our measurements with the Hall probe device achieved an accuracy of 1×10
−5, which is one of the most precise measurements with Hall probes. This provides adequate accuracy for shimming and control of the radial field.
This is a preliminary study investigating the efficacy of aromatase inhibitor anastrozole in treating endometrial hyperplasia in obese postmenopausal women. We administered anastrozole for 12 months ...to 11 obese postmenopausal women with high operative risk, in order to treat endometrial hyperplasia (four simple, five complex and two atypical). Endometrial thickness in all cases and histology too in the two cases with atypia, revealed atrophical endometrium during treatment and additional mean follow-up of 10.2 months. The safety and tolerance profile was satisfactory. Anastrozole appears to be an interesting new modality for the treatment of endometrial hyperplasia in obese postmenopausal women.
The Brookhaven muon ( g−2) storage ring high voltage quadrupoles Semertzidis, Yannis K.; Bennett, Gerald; Efstathiadis, Efstratios ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2003, Letnik:
503, Številka:
3
Journal Article
Recenzirano
The design, construction, and operation of the electrostatic quadrupoles used in the muon (
g−2) experiment E821 of BNL are described in detail. A new lead design allowed the construction of a very ...reliable system which could operate for hundreds of thousands pulses with no sparking. The new design also made possible the elimination of systematic errors associated with the
E,
B fields generated by the low energy trapped electrons present in Penning traps under medium vacuum conditions.
The muon (g 2) experiment E821 is currently in progress at Brookhaven National Laboratory. Four data-taking runs for positive muons and one run for negative muons were successfully accomplished in ...19972000 and 2001, respectively. Results of the 19972000 runs have been published, thus completing our experiment for µ
+
. Data analysis for the 2001 run for µ
is currently in progress. To provide measurement of a
µ
= ½(g 2)
µ
at the same level of accuracy as for a
µ
+ = ½(g 2)
µ
+, we would need one more data-taking run.
PACS Nos.: 31.15Pf, 31.30Jv, 32.10Hq
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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