Precision Measurement of the B+c Meson Mass PDF Download
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Author: Roel Aaij
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Languages : en
Pages : 0
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Author: Roel Aaij
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Category :
Languages : en
Pages : 0
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![A Precision Measurement of the [upsilon-prime] Meson Mass PDF](https://books.google.com/books/content/images/frontcover/X2xmHQAACAAJ?fife=w80-h100)
Author: D. P. Barber
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Languages : de
Pages : 6
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Author: René Nogowski
Publisher:
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Category :
Languages : en
Pages : 119
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Author: René Nogowski
Publisher:
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Category :
Languages : en
Pages :
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![A Precision Measurement of the [upsilon-prime] Meson Mass PDF](https://books.google.com/books/content/images/frontcover/6-7HzQEACAAJ?fife=w80-h100)
Author:
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Category :
Languages : en
Pages : 6
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Author:
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Category :
Languages : en
Pages :
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This work presents a precision determination of the mass difference of neutral and charged B mesons, m(B0) - m(B+). The measurement is based on a data sample of about 232 million B-meson pairs recorded with the BABAR detector at the e+e- storage-ring system PEP-II. In events of e+e- --> Upsilon(4S) --> B Bbar, B0 and B+ mesons are fully reconstructed in decays B+ --> J/psi K+ and B0 --> J/psi K*0 using the subsequent decays J/psi --> l+ l- and K*0 --> K+ pi- for the reconstruction of J/psi mesons and K*0 resonances, respectively. The determination of the mass difference from the measurement of the invariant B-meson masses suffers from detector-resolution effects. To reach the desired sensitivity, the B-meson momenta are measured in the center-of-mass system, the Upsilon(4S) rest frame. Since their energy is also known in the center-of-mass system, this method leads to the mass difference using the relativistic energy-momentum relation. For this purpose, three different fit methods are performed to the spectra of the B momenta. The obtained result is m(B0) - m(B+) = (+0.33 +- 0.05 +- 0.03) MeV/c^2, where the first error is statistical and the second estimates the systematic uncertainty of this measurement, which agrees well with the current world average. However, the combined error of this measurement is substantially smaller than that in the current world average, and the significance of m(B0) - m(B+) being non-zero has exceeded the 5 sigma level.
Author: DP. Barber
Publisher:
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Category :
Languages : en
Pages :
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Author: Paul Goslawski
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Category :
Languages : en
Pages : 166
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Author: Douglas Corey Reher
Publisher:
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Category :
Languages : en
Pages : 316
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Author: Frank E. Jones
Publisher: Chapman and Hall/CRC
ISBN: 9780849325311
Category : Science
Languages : en
Pages : 336
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Book Description
"How much does it weigh?" seems a simple question. To scientists and engineers, however, the answer is far from simple, and determining the answer demands consideration of an almost overwhelming number of factors. With an intriguing blend of history, fundamentals, and technical details, the Handbook of Mass Measurement sets forth the details of achieving the highest precision in mass measurements. It covers the whole field, from the development, calibration, and maintenance of mass standards to detailed accounts of weighing designs, balances, and uncertainty. It addresses the entire measurement process and provides in-depth examinations of the various factors that introduce error. Much of the material is the authors' own work and some of it is published here for the first time. Jones and Schoonover are both highly regarded veterans of the U.S. National Institute of Standards and Technology. With this handbook, they have provided a service and resource vital to anyone involved not only in the determination of mass, but also to the entire field of precision measurement.
