Physics from HERAB. Outline. Data samples Physics topics Pentaquark searches y (2S) production A –dependence bb cross section Summary. 58 th PRC Open session, October 28 th , 2004 M. Mevius, DESY Hamburg. . Data samples. Minimum Bias data. 200 M events on C,Ti,W
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Physics from HERAB
Outline
58th PRC Open session, October 28th, 2004
M. Mevius, DESY Hamburg

58th PRC M.Mevius
Minimum Bias data
200 M events on C,Ti,W
1000 ev/s > 1TB/day
Dilepton triggered data
150 M dilepton trigger events
300 000 J/ (>1000 per hour)
15 000 c
5 000 (2S)
35 M
Hard photon trigger
58th PRC M.Mevius
accepted by Phys. Rev. Lett.
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58th PRC M.Mevius
58th PRC M.Mevius
mass
pK0s mass
NA49
HERAB
UL(95%)

UL(95%)
mass GeV/c2
1.4 1.475 1.55 1.625 1.7
(hepex/0408048) accepted by Phys. Rev. Lett.
Counts
Counts
B d/dy b/C
B d/dy b/C
UL(95%)Bd/dyy=0 =
416 b/N
@ 15211555 MeV/c2
+ / (1520) < 3 – 12 %
UL(95%)Bd/dyy=0 =
2.5 b/N @ 1862 MeV/c2
 / < 3/B%
 / (1530)0< 4/B%
58th PRC M.Mevius
Br’·s(y’)
[%]
Br·s(J/y)
√s
preliminary
Preliminary results for
A
preliminary
58th PRC M.Mevius
dσ/dpT2
xF < 0
e+e
dσ/dxF
preliminary
preliminary
preliminary
m+m
preliminary
58th PRC M.Mevius
similar results for e+e
preliminary
I1I2
I1I2
preliminary
PT
58th PRC M.Mevius
_
_
b(b) B J/ + X
J/ m+m ; e+e
Measurement relative to direct J/ production
to minimize trigger/reconstruction uncertainties
R= relative efficiency1
B selection eff. from MC 3045%
58th PRC M.Mevius
_
preliminary
preliminary
Full statistics
20% sys. error under investigation
main contribution:
Br(bbJ/X) = 2.320.20%

E771/E789 : scaled to 41.6 GeV
(J/)=357 ± 2 ± 36 nb/nucleon
58th PRC M.Mevius
(BR(D0m+m) (UL),pentaquark (UL))
(bb, U, D+/D0, f/K*, J/y, y(2S),...)

58th PRC M.Mevius