Abstract:The production rates of primary vector and P -wave mesons in Z 0 hadronic decays are analysed. The mass dependence of production rates for the bottom, charm, strange charm and three families of the light-flavour mesons is found to be very similar, allowing to relate the relative production rates for mesons with different flavours and, possibly, their masses. The strange axial mesons K 1 (1273) and K 1 (1402) might be assigned to the 1 + (1/2) and 1 + (3/2) levels degenerate with the 0 + (1/2) and 2 + (3/2) lev… Show more
“…More discussions using other models and methods can be found in Refs. [471,472,473,474,475,476,477,398,478,479,480,481,482,483,484,485,486,487,488,489,490].…”
Since the discovery of the first charmed meson in 1976, many open-charm and open-bottom hadrons were observed. In 2003 two narrow charm-strange states D *s0 (2317) and D s1 (2460) were discovered by the BaBar and CLEO Collaborations, respectively. After that, more excited heavy hadrons were reported. In this work, we review the experimental and theoretical progress in this field.
“…More discussions using other models and methods can be found in Refs. [471,472,473,474,475,476,477,398,478,479,480,481,482,483,484,485,486,487,488,489,490].…”
Since the discovery of the first charmed meson in 1976, many open-charm and open-bottom hadrons were observed. In 2003 two narrow charm-strange states D *s0 (2317) and D s1 (2460) were discovered by the BaBar and CLEO Collaborations, respectively. After that, more excited heavy hadrons were reported. In this work, we review the experimental and theoretical progress in this field.
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 Theta(1540)(+); for a double-strange state, the Xi(1862)(--), subsequently called Phi(1860)--; and for a charmed state, the Theta(c)(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: N(Theta)+ x Br(Theta(+) -> pK(S)(0)) < 5.1 x 10(-4), N(Theta++) < 1.6 x 10(-3), N(Phi(1860)--) x Br((P(1860)-- -> Xi(-)pi(-)) < 2.9 x 10(-4), N(Theta c(3100)0) x Br(Theta(c)(3100)(0) -> D*(+)p) < 8.8 x 10(-4). (c) 2007 Elsevier B.V. All rights reserved
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