In order to enable an iCal export link, your account needs to have an API key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
Additionally to having an API key associated with your account, exporting private event information requires the usage of a persistent signature. This enables API URLs which do not expire after a few minutes so while the setting is active, anyone in possession of the link provided can access the information. Due to this, it is extremely important that you keep these links private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately create a new key pair on the 'My Profile' page under the 'HTTP API' and update the iCalendar links afterwards.
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(San Francisco State University)
Aula Seminari (LNF)
Via Enrico Fermi, 40
00044 Frascati (Roma)
We review our recent determination of the strong coupling $\alpha_s$ from the OPAL data for non-strange hadronic tau decays. We find that $\alpha_s(m^2_\tau) =0.325\pm 0.018$ using fixed-order perturbation theory, and $\alpha_s(m^2_\tau)=0.347\pm 0.025$ using contour-improved perturbation theory. These errors are larger than those claimed in previous determinations of $\alpha_s$ from tau decays. The reasons for this are several: (1) The spectral-data moments used in the standard analysis are likely to have an unreliable perturbative expansion, and OPE corrections have not been treated systematically; (2) Violations of quark-hadron duality have been ignored; (3) The nominally more precise ALEPH data are flawed because the correlation matrix is incomplete. We thus consider our determination to supersede all previous values.