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
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP
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 Θ(1540)+; for a double-strange state, the Ξ(1862)−−, subsequently called Φ(1860)−−; and for a charmed state, the Θc(3100)0. If confirmed, a full pentaquark family might exist; such pentaquark states could be produced in e+e− 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 〈N〉 of such particles and their charge-conjugate state per Z decay: 〈NΘ+〉×Br(Θ+→pKS0)<5.1×10−4, 〈NΘ++〉<1.6×10−3, 〈NΦ(1860)−−〉×Br(Φ(1860)−−→Ξ−π−)<2.9×10−4, 〈NΘc(3100)0〉×Br(Θc(3100)0→D∗+p¯)<8.8×10−4.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 653, Issues 2–4, 20 September 2007, Pages 151-160
نویسندگان
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