D0 - anti-D0 oscillations as a probe of quark hadron duality
May, 200015 pages
Published in:
- Nucl.Phys.B 592 (2001) 92-106
e-Print:
- hep-ph/0005089 [hep-ph]
Report number:
- UND-HEP-00-BIG01
View in:
Citations per year
Abstract:
It is usually argued that the Standard Model predicts slow D^0-\bar D^0 oscillations with \Delta M_D, \Delta \Gamma_D < 10^{-3}*\Gamma_D$ and that New Physics can reveal itself through \Delta M_D exceeding 10^{-3}*\Gamma_D. It is believed that the bulk of the effect is due to long distance dynamics that cannot be described at the quark level. We point out that in general the OPE yields soft GIM suppression scaling only like (m_s/\mu_{hadr})^2 and even like m_s/\mu_{hadr} rather than m_s^4/m_c^4 of the simple quark box diagram. Such contributions can actually yield \Delta M_D, \Delta \Gamma_D \sim O(10^{-3})*\Gamma_D without invoking additional long distance effects. They are reasonably suppressed as long as the OPE and local duality are qualitatively applicable in the 1/m_c expansion. We stress the importance of improving the sensitivity on \Delta \Gamma_D as well as \Delta M_D in a dedicated fashion as a laboratory for analyzing the onset of quark-hadron duality and comment on the recent preliminary study on \Delta \Gamma_D by the FOCUS group.Note:
- 15 pages, LaTeX. Revised: A reference and a few clarifications in the text are added. A few inconsistencies in equations are eliminated. We found the standard contribution to Delta M_D to differ from the expression usually quoted in the literature
- D0 anti-D0: oscillation
- quark hadron: duality
- D0: width
- D0 anti-D0: mass difference
- operator product expansion
- Feynman graph
- D0: hadronic decay
- D0: branching ratio
- numerical calculations
- D0 --> 2pseudoscalar meson
References(20)
Figures(0)