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| Home > Publications database > Measurement of the parity violating asymmetry parameter $\alpha_b$ and the helicity amplitudes for the decay $\Lambda_b^0\to \it{J}/$$\psi\Lambda^0$ in the ATLAS experiment |
| Home > Publications database > Measurement of the parity violating asymmetry parameter $\alpha_b$ and the helicity amplitudes for the decay $\Lambda_b^0\to \it{J}/$$\psi\Lambda^0$ in the ATLAS experiment |
| Preprint/Internal Report | DESY-2013-00646 |
2013
Report No.: ATLAS-CONF-2013-071
Abstract: A measurement of the parity violating decay asymmetry parameter, b, and the helicityamplitudes for the 0bhyperon decay 0b! J= (+)0(p) is reported. The analysis isbased on about 1400 0band ¯0bbaryons selected in 4:6 fb1 of proton-proton collision datarecorded by the ATLAS experiment at the LHC with a center-of-mass energy of 7 TeV. Bycombining the 0band ¯0b samples under the assumption of CP conservation, the value ofb was measured to be 0:28 0:16(stat) 0:06(syst). This measurement provides a test ofseveral theoretical models that predict b values ranging from -0.2 to +0.8.
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