کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1853201 | 1528924 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
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چکیده انگلیسی
The quark model does not exclude states composed of more than three quarks, like pentaquark systems. Controversial evidence for such states has been published in the last years, in particular: for a strange pentaquark Î(1540)+; for a double-strange state, the Î(1862)ââ, subsequently called Φ(1860)ââ; and for a charmed state, the Îc(3100)0. If confirmed, a full pentaquark family might exist; such pentaquark states could be produced in e+eâ annihilations near the Z energy. In this Letter a search for pentaquarks is described using the DELPHI detector at LEP, characterized by powerful particle identification sub-systems crucial in the separation of the signal from the background for these states. At 95% CL, upper limits are set on the production rates ãNã of such particles and their charge-conjugate state per Z decay: ãNÎ+ãÃBr(Î+âpKS0)<5.1Ã10â4, ãNÎ++ã<1.6Ã10â3, ãNΦ(1860)ââãÃBr(Φ(1860)âââÎâÏâ)<2.9Ã10â4, ãNÎc(3100)0ãÃBr(Îc(3100)0âDâ+p¯)<8.8Ã10â4.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 653, Issues 2â4, 20 September 2007, Pages 151-160
Journal: Physics Letters B - Volume 653, Issues 2â4, 20 September 2007, Pages 151-160
نویسندگان
DELPHI Collaboration DELPHI Collaboration, J. Abdallah, P. Abreu, W. Adam, P. Adzic, T. Albrecht, R. Alemany-Fernandez, T. Allmendinger, P.P. Allport, U. Amaldi, N. Amapane, S. Amato, E. Anashkin, A. Andreazza, S. Andringa, N. Anjos, P. Antilogus,