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Title: Status And Prospects for the Measurement of Angle Gamma


No abstract prepared.

Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
TRN: US0601753
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Prepared for DAFNE 2004: Workshop on Physics at Meson Factories, Rome, Frascati, Italy, 7-11 Jun 2004
Country of Publication:
United States

Citation Formats

Legendre, M., and /DAPNIA, Saclay. Status And Prospects for the Measurement of Angle Gamma. United States: N. p., 2005. Web.
Legendre, M., & /DAPNIA, Saclay. Status And Prospects for the Measurement of Angle Gamma. United States.
Legendre, M., and /DAPNIA, Saclay. Fri . "Status And Prospects for the Measurement of Angle Gamma". United States. doi:.
title = {Status And Prospects for the Measurement of Angle Gamma},
author = {Legendre, M. and /DAPNIA, Saclay},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Nov 11 00:00:00 EST 2005},
month = {Fri Nov 11 00:00:00 EST 2005}

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  • The methods to measure the angle{gamma} of the CKM unitarity triangle at the B factories are presented. Special emphasis is given to the measurement of sin(2{beta} + {gamma}) using the B{sup 0} {yields} D*{sup {+-}} {pi}{sup {-+}} decays which has already produced results providing an interesting constraint in the {rho} - {eta} plane. Various methods using B {yields} DK decays are also presented.
  • We report on the measurement of the CKM angle {gamma} in B{sup {+-}} {yields} DK{sup {+-}} decays with the BABAR detector. A general overview of different methods of analysis and a critical discussion of the most sensitive methods are presented here.
  • The use of neutron-capture gamma rays for elemental analysis has become an established technique, applicable for the measurement of a list of elements which complements conventional delayed-gamma neutron activation analysis. Three distinct areas of application of the prompt method have been laboratory-based analysis using reactor neutrons, field measurements (especially borehole logging for mineral exploration), and industrial process stream analysis, the latter two using neutron generators or isotopic neutron sources. Continued improvements in detector systems and the increasing availability of clean, high-intensity beams from cold-neutron guide tubes are opening quantitatively and qualitatively new analytical possibilities. Second generation instruments using cold neutronsmore » promise an increase in reaction rate of up to two orders of magnitude. This will increae the productivity of these facilities by a similar factor, and will make the use of capture gamma rays more nearly comparable in sensitivity to conventional neutron activation analysis whenever the sample may be brought to the neutrons.« less
  • The recent experimental results on CP violation related to the angles of the Cabibbo-Kobayashi-Maskawa (CKM) unitarity triangle 2{beta} + {gamma} are summarized in these proceedings. These results are obtained with approximately 232 million {Upsilon}(4S) {yields} B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy B-factory at SLAC. Using the measurements on time-dependent CP asymmetries in B{sup 0} {yields} D{sup (*){-+}} {pi}{sup {-+}} and B{sup 0} {yields} D{sup {-+}}{rho}{sup {+-}} decays and theoretical assumptions, one finds | sin(2{beta} + {gamma}) | > 0.64 (0.40) at 68% (90%) confidence level. The perspectives of sin(2{beta} + {gamma}) measurement with {barmore » B}{sup 0} {yields} D{sup (*)0} {bar K}{sup (*)0} and B{sup 0} {yields} D{sup (*){-+}}{alpha}{sub 0(2)}{sup {+-}} decay channels are also discussed.« less
  • The potential for a precise measurement of the unitarity triangle angle {gamma} in future experiments from the decay B{sup 0}{yields}DK*{sup 0} is well known. It has recently been suggested that the sensitivity can be significantly enhanced by analyzing the B{sup 0}{yields}DK{sup +}{pi}{sup -} Dalitz plot to extract amplitudes relative to those of the flavor-specific decay B{sup 0}{yields}D{sub 2}*{sup -}K{sup +}. An extension to this method which includes the case where the neutral D meson is reconstructed in suppressed final states is presented. The sensitivity to {gamma} is estimated using this method and compared to that obtained using the B{sup 0}{yields}DK*{supmore » 0} decay alone. Experimental effects, such as background contamination, are also considered. This approach appears to be a highly attractive addition to the family of methods that can be used to determine {gamma}.« less