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Vub measurement using recoil of fully reconstructed Bs

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Subject:
From:
Daniele del Re <[log in to unmask]>
Date:
07 Mar 2003 01:22:39 -0800 (PST)Fri, 07 Mar 2003 01:22:39 -0800 (PST)
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Hi,

 I am bit confused by these numbers.

 Let' take the resonant ones.
 In the DECAY.DEC we have (B0 for instance):

 0.000180   pi+    e-   anti-nu_e        PHOTOS   ISGW2;
 0.000260   rho+   e-   anti-nu_e        PHOTOS   ISGW2;
 0.000165   a_1+    e-   anti-nu_e        PHOTOS   ISGW2;
 0.000102   b_1+    e-   anti-nu_e        PHOTOS   ISGW2;
 0.000014   a_0+    e-   anti-nu_e        PHOTOS   ISGW2;
 0.000014   a_2+    e-   anti-nu_e        PHOTOS   ISGW2;

 pi and rho cannot go in kaons. 60% is already gone.
 This implies that a_1,b_1, ecc.. have to go in the 25% of the cases in
kaons.

 I see:

 Decay a_1+
 0.4920   rho0 pi+                        VVS_PWAVE 1.0 0.0 0.0 0.0 0.0 0.0;
 0.5080   rho+ pi0                        VVS_PWAVE 1.0 0.0 0.0 0.0 0.0 0.0;

 Decay b_1+
 0.9984   omega pi+                        VVS_PWAVE 1.0 0.0 0.0 0.0 0.0 0.0;
 0.0016   pi+  gamma                       VSP_PWAVE;

 Decay a_0+
0.9000    eta  pi+                       PHSP;
0.1000    anti-K0    K+                        PHSP;

 Decay a_2+
0.3500   rho0 pi+                        TVS_PWAVE 0.0 0.0 1.0 0.0 0.0 0.0;
0.3500   rho+ pi0                        TVS_PWAVE 0.0 0.0 1.0 0.0 0.0 0.0;
0.1440   eta  pi+                        TSS;
0.1050   omega pi+ pi0                    PHSP;
0.0480   anti-K0   K+                         TSS;
0.0030   pi+  gamma                       PHSP;


 Only a_0 and a_2 can contribute.
 Then it should be 10%*2% + 5%*2% = 0.3%

 Similar argument for the B+.

 Then, where does that 10% come from? What am I missing here?


 Daniele


>
> Hoi,
>
> the determination of this involved  a bit more than calculating the BF
> in DECAY.DEC, since I was  interested also in the JETSET ssbar popping
> rates for the nonresonant MC.
>
> In   http://www.slac.stanford.edu/~ursl/talks/030603/ssbar.eps.gz  you
> can find the p* distribution of el  and mu in all b2u events (top), in
> b2u  events  without  strangeness  (middle)  and in  b2u  events  with
> strangeness (bottom).  The left column shows  resonant production, the
> right column non-resonant.
>
> In  resonant (non-resonant)  b2u events  the fraction  of  events with
> strangeness is 0.120+/-0.004 (0.162+/-0.003). The error is statistical.
>
> Cheers,
> --U.
>
>
> PS: The different shapes of these spectra ...
>



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