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VUB-RECOIL July 2002
Subject:
spectra for the B0's
From:
Daniele del Re <[log in to unmask]>
Date:
11 Jul 2002 16:15:07 -0700 (PDT)Thu, 11 Jul 2002 16:15:07 -0700 (PDT)
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TEXT/PLAIN (43 lines)
Hi all, while I was trying to get the spectrum for the lepton for b->ulnu transitions I observed strange disagreements between data and MC for the B0's. Look at the following plots. These are the P* spectra just after the all cuts. all http://www.slac.stanford.edu/~daniele/vub/spectrafitdata.eps B0 http://www.slac.stanford.edu/~daniele/vub/spectrafitdataBch.eps Bch http://www.slac.stanford.edu/~daniele/vub/spectrafitdataBch.eps As you see there is an excess at high P* and all the discepancy comes from B0's. If you look at the single plots before mixing correction (right sign is the top right one and wrong sign is the left bottom one) for data and MC data http://www.slac.stanford.edu/~daniele/vub/spectradata.eps generic MC (cocktail): http://www.slac.stanford.edu/~daniele/vub/spectravcb.eps it seems that for the data right sing the spectrum is harder while the wrong sing is softer (with respect to the generic MC). Probably this effect could be related with the troubles we are facing in the B0's and perhaps correlated with the problem shown today by Urs. Daniele
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