Study of the rare hyperon decay Ω∓→Ξ∓π+π-

O. Kamaev; N. Solomey; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. D. Jones; D. M. Kaplan; M. J. Longo; L. C. Lu; W. Luebke; K. Luk; K. S. Nelson; H. K. Park; J. P. Perroud; D. Rajaram; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla

doi:10.1016/j.physletb.2010.08.037

Study of the rare hyperon decay Ω^∓→Ξ^∓π⁺π^-

O. Kamaev
, N. Solomey
, R. A. Burnstein
, A. Chakravorty
, Y. C. Chen
, W. S. Choong
, K. Clark
, E. C. Dukes
, C. Durandet
, J. Felix
, Y. Fu
, G. Gidal
, H. R. Gustafson
, T. Holmstrom
, M. Huang
, C. James
, C. M. Jenkins
, T. D. Jones
, D. M. Kaplan^*
, M. J. Longo

L. C. Lu, W. Luebke, K. Luk, K. S. Nelson, H. K. Park, J. P. Perroud, D. Rajaram, H. A. Rubin, J. Volk, C. G. White, S. L. White, P. Zyla

^*Corresponding author for this work

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

1 Citation (Scopus)

Abstract

We report a new measurement of the decay Ω^-→Ξ^-π⁺π^- with 76 events and a first observation of the decay Ω̄⁺→Ξ̄⁺π⁺π^- with 24 events, yielding a combined branching ratio (3.74_-0.56^+0.67)×10-4. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with B( Ω^-→Ξ^-π⁺π^-)=4.04_-0.71^+0.83×10^-4 and B(Ω̄⁺→Ξ̄⁺π⁺π^-)=3.15_-0.89^+1.12×10^-4. Contrary to theoretical expectation, we see little evidence for the decays Ω^-→Ξ₁₅₃₀^*0π^- and Ω̄⁺→Ξ̄₁₅₃₀^*0π⁺ and place a 90% C.L. upper limit on the combined branching ratio B(Ω^-(Ω̄⁺)→Ξ₁₅₃₀^*0(Ω̄₁₅₃₀^*0)π^∓)<7.0×10^-5.

Original language	English
Pages (from-to)	236-240
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	693
Issue number	3
DOIs	https://doi.org/10.1016/j.physletb.2010.08.037
Publication status	Published - 2010 Oct
Externally published	Yes

Keywords

CP violation
Hyperon resonances
Omega-minus decays

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/j.physletb.2010.08.037

Cite this

Kamaev, O., Solomey, N., Burnstein, R. A., Chakravorty, A., Chen, Y. C., Choong, W. S., Clark, K., Dukes, E. C., Durandet, C., Felix, J., Fu, Y., Gidal, G., Gustafson, H. R., Holmstrom, T., Huang, M., James, C., Jenkins, C. M., Jones, T. D., Kaplan, D. M., ... Zyla, P. (2010). Study of the rare hyperon decay Ω^∓→Ξ^∓π⁺π^-. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 693(3), 236-240. https://doi.org/10.1016/j.physletb.2010.08.037

Kamaev, O, Solomey, N, Burnstein, RA, Chakravorty, A, Chen, YC, Choong, WS, Clark, K, Dukes, EC, Durandet, C, Felix, J, Fu, Y, Gidal, G, Gustafson, HR, Holmstrom, T, Huang, M, James, C, Jenkins, CM, Jones, TD, Kaplan, DM, Longo, MJ, Lu, LC, Luebke, W, Luk, K, Nelson, KS, Park, HK, Perroud, JP, Rajaram, D, Rubin, HA, Volk, J, White, CG, White, SL & Zyla, P 2010, 'Study of the rare hyperon decay Ω^∓→Ξ^∓π⁺π^-', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 693, no. 3, pp. 236-240. https://doi.org/10.1016/j.physletb.2010.08.037

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title = "Study of the rare hyperon decay Ω∓→Ξ∓π+π-",

abstract = "We report a new measurement of the decay Ω-→Ξ-π+π- with 76 events and a first observation of the decay {\=Ω}+→{\=Ξ}+π+π- with 24 events, yielding a combined branching ratio (3.74-0.56+0.67)×10-4. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with B( Ω-→Ξ-π+π-)=4.04-0.71+0.83×10-4 and B({\=Ω}+→{\=Ξ}+π+π-)=3.15-0.89+1.12×10-4. Contrary to theoretical expectation, we see little evidence for the decays Ω-→Ξ1530*0π- and {\=Ω}+→{\=Ξ}1530*0π+ and place a 90\% C.L. upper limit on the combined branching ratio B(Ω-({\=Ω}+)→Ξ1530*0({\=Ω}1530*0)π∓)<7.0×10-5.",

keywords = "CP violation, Hyperon resonances, Omega-minus decays",

author = "O. Kamaev and N. Solomey and Burnstein, \{R. A.\} and A. Chakravorty and Chen, \{Y. C.\} and Choong, \{W. S.\} and K. Clark and Dukes, \{E. C.\} and C. Durandet and J. Felix and Y. Fu and G. Gidal and Gustafson, \{H. R.\} and T. Holmstrom and M. Huang and C. James and Jenkins, \{C. M.\} and Jones, \{T. D.\} and Kaplan, \{D. M.\} and Longo, \{M. J.\} and Lu, \{L. C.\} and W. Luebke and K. Luk and Nelson, \{K. S.\} and Park, \{H. K.\} and Perroud, \{J. P.\} and D. Rajaram and Rubin, \{H. A.\} and J. Volk and White, \{C. G.\} and White, \{S. L.\} and P. Zyla",

year = "2010",

month = oct,

doi = "10.1016/j.physletb.2010.08.037",

language = "English",

volume = "693",

pages = "236--240",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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T1 - Study of the rare hyperon decay Ω∓→Ξ∓π+π-

AU - Kamaev, O.

AU - Solomey, N.

AU - Burnstein, R. A.

AU - Chakravorty, A.

AU - Chen, Y. C.

AU - Choong, W. S.

AU - Clark, K.

AU - Dukes, E. C.

AU - Durandet, C.

AU - Felix, J.

AU - Fu, Y.

AU - Gidal, G.

AU - Gustafson, H. R.

AU - Holmstrom, T.

AU - Huang, M.

AU - James, C.

AU - Jenkins, C. M.

AU - Jones, T. D.

AU - Kaplan, D. M.

AU - Longo, M. J.

AU - Lu, L. C.

AU - Luebke, W.

AU - Luk, K.

AU - Nelson, K. S.

AU - Park, H. K.

AU - Perroud, J. P.

AU - Rajaram, D.

AU - Rubin, H. A.

AU - Volk, J.

AU - White, C. G.

AU - White, S. L.

AU - Zyla, P.

PY - 2010/10

Y1 - 2010/10

N2 - We report a new measurement of the decay Ω-→Ξ-π+π- with 76 events and a first observation of the decay Ω̄+→Ξ̄+π+π- with 24 events, yielding a combined branching ratio (3.74-0.56+0.67)×10-4. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with B( Ω-→Ξ-π+π-)=4.04-0.71+0.83×10-4 and B(Ω̄+→Ξ̄+π+π-)=3.15-0.89+1.12×10-4. Contrary to theoretical expectation, we see little evidence for the decays Ω-→Ξ1530*0π- and Ω̄+→Ξ̄1530*0π+ and place a 90% C.L. upper limit on the combined branching ratio B(Ω-(Ω̄+)→Ξ1530*0(Ω̄1530*0)π∓)<7.0×10-5.

AB - We report a new measurement of the decay Ω-→Ξ-π+π- with 76 events and a first observation of the decay Ω̄+→Ξ̄+π+π- with 24 events, yielding a combined branching ratio (3.74-0.56+0.67)×10-4. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with B( Ω-→Ξ-π+π-)=4.04-0.71+0.83×10-4 and B(Ω̄+→Ξ̄+π+π-)=3.15-0.89+1.12×10-4. Contrary to theoretical expectation, we see little evidence for the decays Ω-→Ξ1530*0π- and Ω̄+→Ξ̄1530*0π+ and place a 90% C.L. upper limit on the combined branching ratio B(Ω-(Ω̄+)→Ξ1530*0(Ω̄1530*0)π∓)<7.0×10-5.

KW - CP violation

KW - Hyperon resonances

KW - Omega-minus decays

UR - https://www.scopus.com/pages/publications/77956877793

U2 - 10.1016/j.physletb.2010.08.037

DO - 10.1016/j.physletb.2010.08.037

M3 - Article

AN - SCOPUS:77956877793

SN - 0370-2693

VL - 693

SP - 236

EP - 240

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 3

ER -