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A precise measurement of the pseudos...

Stanford University.

A precise measurement of the pseudoscalar decay constant fDs using charm-tagged events in the electron-positron collisions at the upsilon(4S).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A precise measurement of the pseudoscalar decay constant fDs using charm-tagged events in the electron-positron collisions at the upsilon(4S).
作者:	Stelzer, Jorg.
面頁冊數:	231 p.
附註:	Adviser: Rafe Schindler.
附註:	Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2627.
Contained By:	Dissertation Abstracts International67-05B.
標題:	Physics, Elementary Particles and High Energy.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3219391
ISBN:	9780542708251

A precise measurement of the pseudoscalar decay constant fDs using charm-tagged events in the electron-positron collisions at the upsilon(4S).
Stelzer, Jorg.

A precise measurement of the pseudoscalar decay constant fDs using charm-tagged events in the electron-positron collisions at the upsilon(4S). - 231 p.

Adviser: Rafe Schindler.

Thesis (Ph.D.)--Stanford University, 2006.

Measurement of the pseudoscalar decay constant fDs of the charm strange meson D+s is a benchmark test of the theoretical methods, foremost lattice QCD, that quantitatively describe the non-perturbative low-energy regime of QCD. From 1999 through 2004, the BABAR experiment, at the PEP-II storage ring at the Stanford Linear Accelerator Center, collected 230.2 fb -1 of data in e+e - collision at s = 10.58 GeV. In this thesis, a sample of 510,000 charmed mesons arising from e+e- → cc¯ events is identified, and the decay D*+s → gD+s gammamu+nu is searched for in the recoil. A total of 489 +/- 55 decays are detected. In the same charm-tagged sample 2093 +/- 99 events containing the decay D*+s → gD+s → gamma&phis;pi+ are isolated, yielding the ratio of the partial widths: Gamma( D+s → mu+numu)/Gamma( D+s → &phis;pi+) = 0.143 +/- 0.018stat +/- 0.006sys. Using B ( D+s → &phis;pi+) = (4.81 +/- 0.64) %, the branching fraction B ( D+s → mu+numu) = (6.65+/-0.81 stat+/-0.25sys+/-0.88norm) %, and the pseudoscalar decay constant fDs = (281 +/-17stat +/- 6sys +/- 19norm) MeV are calculated. These measurements are comparable in precision with the world average. In combination with fD (CLEO-c), good agreement with lattice QCD calculations is found: ( fDs /fD)/( fDs /fD)lattice = 1.01 +/- 0.11.

ISBN: 9780542708251Subjects--Topical Terms:

227490
Physics, Elementary Particles and High Energy.

A precise measurement of the pseudoscalar decay constant fDs using charm-tagged events in the electron-positron collisions at the upsilon(4S).
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