Measurement of Decay Parameters for ${\ensuremath{\Xi}}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\Lambda}{\ensuremath{\pi}}^{\ensuremath{-}}$ Decay

Measurement of Decay Parameters for $Ξ^{-} \to Λ π^{-}$ Decay

A. Chakravorty, H. T. Diehl, J. Duryea, G. Guglielmo, K. Heller, P. M. Ho, C. James, K. Johns, D. M Kaplan, M. J. Longo, K. B. Luk, R. Rameika, H. A. Rubin, S. Teige, G. B. Thomson, and Y. Zou (Fermilab E756 Collaboration)

Phys. Rev. Lett. 91, 031601 – Published 15 July 2003

Abstract

Based on $1.35 \times 10^{6}$ polarized $Ξ^{-}$ events, we measure the parameter $ϕ_{Ξ}$ to be $- 1.61 ° \pm 2.66 ° \pm 0.37 °$ for the $Ξ^{-} \to Λ π^{-}$ decay. New results for the parameters $β_{Ξ}$ and $γ_{Ξ}$ are also presented. Assuming that the $C P$ -violating phase difference is negligible, we deduce the strong phase difference between the $P$ -wave and $S$ -wave amplitudes of the $Λ π$ final state to be $3.17 ° \pm 5.28 ° \pm 0.73 °$ , reducing the uncertainty in estimating the level of $C P$ violation in $Ξ$ -hyperon decay.

Received 19 February 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.031601

Authors & Affiliations

A. Chakravorty⁴, H. T. Diehl^7,*, J. Duryea^6,†, G. Guglielmo^6,*, K. Heller⁶, P. M. Ho^2,‡, C. James³, K. Johns^6,§, D. M Kaplan⁴, M. J. Longo⁵, K. B. Luk^1,2, R. Rameika³, H. A. Rubin⁴, S. Teige^7,∥, G. B. Thomson⁷, and Y. Zou⁷ (Fermilab E756 Collaboration)

¹Department of Physics, University of California, Berkeley, California 94720, USA
²Physics Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
³Fermilab, Batavia, Illinois 60510, USA
⁴Physics Division, Illinois Institute of Technology, Chicago, Illinois 60616, USA
⁵Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
⁶School of Physics, University of Minnesota, Minneapolis, Minnesota 55455, USA
⁷Department of Physics and Astronomy, Rutgers–The State University, Piscataway, New Jersey 08854, USA

^*Present address: Fermilab, Batavia, IL 60510, USA.
^†Present address: Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA.
^‡Present address: Visa International, 3055 Clearview Way, MS 3A, San Mateo, CA 94402, USA.
^§Present address: Department of Physics, University of Arizona, Tucson, AZ 85721, USA.
^∥Present address: Department of Physics, Indiana University, Bloomington, IN 47405, USA.

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 91, Iss. 3 — 18 July 2003

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review Letters

Measurement of Decay Parameters for Ξ−→Λπ− Decay

A. Chakravorty, H. T. Diehl, J. Duryea, G. Guglielmo, K. Heller, P. M. Ho, C. James, K. Johns, D. M Kaplan, M. J. Longo, K. B. Luk, R. Rameika, H. A. Rubin, S. Teige, G. B. Thomson, and Y. Zou (Fermilab E756 Collaboration)

Phys. Rev. Lett. 91, 031601 – Published 15 July 2003

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Authorization Required

Other Options

Download & Share

Images

Figure 1

Figure 2

Log In

Search

Article Lookup

Paste a citation or DOI

Enter a citation

Measurement of Decay Parameters for $Ξ^{-} \to Λ π^{-}$ Decay