The results of background measurements with the prototype of the Borexino detector (CTF) have been used to obtain an upper bound on the neutrino magnetic moment, μν. The new upper limit for μν from ...pp and 7Be solar neutrinos is (5.5×10−10)μB (90% c.l.) in the Standard Solar Model scenario. This is the first limit on μν obtained using sub-MeV neutrinos. The sensitivity of the prototype to the neutrino charge radius and the neutrino radiative decay are also presented.
Using data collected by the high energy photoproduction experiment FOCUS at Fermilab we study the doubly and singly Cabibbo suppressed decays
D
+
and
D
s
+
→
K
+
π
+
π
−
. Our measurements of
Γ
(
D
+
...→
K
+
π
+
π
−
)
/
Γ
(
D
+
→
K
−
π
+
π
+
)
=
0.0065
±
0.0008
±
0.0004
and
Γ
(
D
s
+
→
K
+
π
+
π
−
)
/
Γ
(
D
s
+
→
K
+
K
−
π
+
)
=
0.127
±
0.007
±
0.014
are based on samples of
189
±
24
D
+
and
567
±
31
D
s
+
reconstructed events, respectively. We also present Dalitz plot analyses of the two decay channels; the amplitude analysis of the
D
s
+
→
K
+
π
+
π
−
mode is performed for the first time.
We present a search for a pentaquark decaying strongly to pKS0 in γN collisions at a center-of-mass energy up to 25 GeV. Finding no evidence for such a state in the mass range of 1470 MeV/c2 to ...2200 MeV/c2, we set limits on the yield and on the cross section times branching ratio relative to Σ∗(1385)± and K∗(892)+.
We present a search for a pentaquark decaying strongly to pK0S in γN collisions at a center-of-mass energy up to 25 GeV/c2. Finding no evidence for such a state in the mass range of 1470 MeV/c2 to ...2200 MeV/c2, we set limits on the yield and on the cross section times branching ratio relative to Σ* (1385)± and K* (892) +.
Using data collected by the FOCUS experiment at Fermilab, we present a new measurement of the charm semileptonic branching ratio BR(D+→ρ0μ+ν)BR(D+→K¯∗0μ+ν). From a sample of 320±44 and ...11372±161D+→ρ0μ+ν and D+→K−π+μ+ν events respectively, we find BR(D+→ρ0μ+ν)BR(D+→K¯∗0μ+ν)=0.041±0.006 (stat)±0.004 (syst).
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