Semileptonic Decays of the B-meson
نویسنده
چکیده
Recent results on tile selnileptonic clecay of B-n]esons are reported fronl tile .4RGUS experinleut, operating at tile DORIS 11 e+estorage riug at DESY, T~vo new nleasurelnents of tile inclusive sexnilept.onic I)ranclling ratio are presented ;vllicll are iu agreenlent Ivitll previous results ancl renlain sonle~vllat lolver than theoretical preclictions. One analysis, in particldar. strives to reduce t.lle nlodel depelldcllce I>yexauliuing tile inclusive lepton spectrunl to 101vnloulellta, yieldiug a result of 10,9 & 0,6 * 0.4%. An exaulination of (Ixclusive decays to D and DInesons confirnl that tile iuclusive rate is not saturated I)y these channels l>ut tile discrepancy is explained I)y tlvo ne~v measurenlellts of a large B ~ D“*CUI>raucllillg ratio of 4.0X 0.6A 0.2% and 3.8A 0.9* 0.6%.
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