Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Search for Pentaquarks in the Hadronic Decays of the Z Boson with the DELPHI Detector at LEP.
AU - Abdallah, J.
AU - Sopczak, Andre
AU - DELPHI Collaboration, et al.
PY - 2007/9/20
Y1 - 2007/9/20
N2 - 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++<1.6×10−3, NΦ(1860)−−×Br(Φ(1860)−−→Ξ−π−)<2.9×10−4, .
AB - 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++<1.6×10−3, NΦ(1860)−−×Br(Φ(1860)−−→Ξ−π−)<2.9×10−4, .
U2 - 10.1016/j.physletb.2007.08.005
DO - 10.1016/j.physletb.2007.08.005
M3 - Journal article
VL - 653
SP - 151
EP - 160
JO - Physics Letters B
JF - Physics Letters B
SN - 0370-2693
IS - 2-4
ER -