Lessons from CLEO and FOCUS measurements of D0 - D̄0 mixing parameters

S. Bergmann; Y. Grossman; Z. Ligeti; Y. Nir; A. A. Petrov

doi:10.1016/S0370-2693(00)00772-3

Lessons from CLEO and FOCUS measurements of D⁰ - D̄⁰ mixing parameters

S. Bergmann, Y. Grossman, Z. Ligeti, Y. Nir, A. A. Petrov

Research output: Contribution to journal › Article › peer-review

134 Scopus citations

Abstract

If the true values of the D⁰ - D̄⁰ mixing parameters lie within the one sigma ranges of recent measurements, then there is strong evidence for a large width difference, y ≥ 0.01, and large SU(3) breaking effects in strong phases, δ ≥ π/4. These constraints are model independent, and would become stronger if |M₁₂/Γ₁₂| << 1 in the D⁰ - D̄⁰ system. The interesting fact that the FOCUS result cannot be explained by a large mass difference is not trivial and depends on the small D⁰/D̄⁰ production asymmetry in FOCUS and the bounds on CP violating effects from CLEO. The large value of δ might help explain why y ~ sin²θ(c). (C) 2000 Elsevier Science B.V.

Original language	English
Pages (from-to)	418-425
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	486
Issue number	3-4
DOIs	https://doi.org/10.1016/S0370-2693(00)00772-3
State	Published - 3 Aug 2000
Externally published	Yes

Bibliographical note

Funding Information:
We thank David Asner, Adam Falk, Harry Nelson and Jim Wiss for useful discussions. S.B. thanks the School of Natural Sciences at the Institute for Advanced Study for the hospitality. Y.G. is supported by the US Department of Energy under contract DE-AC03-76SF00515. Fermilab is operated by Universities Research Association, Inc., under DOE contract DE-AC02-76CH03000. Y.N. is supported by the Department of Energy under contract No. DE–FG02–90ER40542, by the Ambrose Monell Foundation, by AMIAS (Association of Members of the Institute for Advanced Study), by the Israel Science Foundation founded by the Israel Academy of Sciences and Humanities, and by the Minerva Foundation (Munich).

Funding

We thank David Asner, Adam Falk, Harry Nelson and Jim Wiss for useful discussions. S.B. thanks the School of Natural Sciences at the Institute for Advanced Study for the hospitality. Y.G. is supported by the US Department of Energy under contract DE-AC03-76SF00515. Fermilab is operated by Universities Research Association, Inc., under DOE contract DE-AC02-76CH03000. Y.N. is supported by the Department of Energy under contract No. DE–FG02–90ER40542, by the Ambrose Monell Foundation, by AMIAS (Association of Members of the Institute for Advanced Study), by the Israel Science Foundation founded by the Israel Academy of Sciences and Humanities, and by the Minerva Foundation (Munich).

Funders	Funder number
AMIAS
Universities Research Association, Inc.
U.S. Department of Energy	DE-AC02-76CH03000, DE-AC03-76SF00515, DE–FG02–90ER40542
Ambrose Monell Foundation
Minerva Foundation
Israel Academy of Sciences and Humanities
Israel Science Foundation

Access to Document

10.1016/S0370-2693(00)00772-3

Cite this

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title = "Lessons from CLEO and FOCUS measurements of D0 - {\=D}0 mixing parameters",

abstract = "If the true values of the D0 - {\=D}0 mixing parameters lie within the one sigma ranges of recent measurements, then there is strong evidence for a large width difference, y ≥ 0.01, and large SU(3) breaking effects in strong phases, δ ≥ π/4. These constraints are model independent, and would become stronger if |M12/Γ12| << 1 in the D0 - {\=D}0 system. The interesting fact that the FOCUS result cannot be explained by a large mass difference is not trivial and depends on the small D0/{\=D}0 production asymmetry in FOCUS and the bounds on CP violating effects from CLEO. The large value of δ might help explain why y ~ sin2θ(c). (C) 2000 Elsevier Science B.V.",

author = "S. Bergmann and Y. Grossman and Z. Ligeti and Y. Nir and Petrov, {A. A.}",

note = "Funding Information: We thank David Asner, Adam Falk, Harry Nelson and Jim Wiss for useful discussions. S.B. thanks the School of Natural Sciences at the Institute for Advanced Study for the hospitality. Y.G. is supported by the US Department of Energy under contract DE-AC03-76SF00515. Fermilab is operated by Universities Research Association, Inc., under DOE contract DE-AC02-76CH03000. Y.N. is supported by the Department of Energy under contract No. DE–FG02–90ER40542, by the Ambrose Monell Foundation, by AMIAS (Association of Members of the Institute for Advanced Study), by the Israel Science Foundation founded by the Israel Academy of Sciences and Humanities, and by the Minerva Foundation (Munich).",

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AU - Petrov, A. A.

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N2 - If the true values of the D0 - D̄0 mixing parameters lie within the one sigma ranges of recent measurements, then there is strong evidence for a large width difference, y ≥ 0.01, and large SU(3) breaking effects in strong phases, δ ≥ π/4. These constraints are model independent, and would become stronger if |M12/Γ12| << 1 in the D0 - D̄0 system. The interesting fact that the FOCUS result cannot be explained by a large mass difference is not trivial and depends on the small D0/D̄0 production asymmetry in FOCUS and the bounds on CP violating effects from CLEO. The large value of δ might help explain why y ~ sin2θ(c). (C) 2000 Elsevier Science B.V.

AB - If the true values of the D0 - D̄0 mixing parameters lie within the one sigma ranges of recent measurements, then there is strong evidence for a large width difference, y ≥ 0.01, and large SU(3) breaking effects in strong phases, δ ≥ π/4. These constraints are model independent, and would become stronger if |M12/Γ12| << 1 in the D0 - D̄0 system. The interesting fact that the FOCUS result cannot be explained by a large mass difference is not trivial and depends on the small D0/D̄0 production asymmetry in FOCUS and the bounds on CP violating effects from CLEO. The large value of δ might help explain why y ~ sin2θ(c). (C) 2000 Elsevier Science B.V.

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