A nascent project to develop a design for a multi-kiloton Liquid Argon Time Projection Chamber for a
ν
e
appearance experiment in the NuMI Off-axis beam is described. This is a summary of part of my ...talk given at NuFACT05. An updated and more complete description of the project is given in D. Finley et al., Fermilab FN-0776-E.
We describe the system known as the Tevatron SBD 1 which is used to provide information on the longitudinal parameters of coalesced beam bunches in the Tevatron. The system has been upgraded over the ...past year with a new digitizer and improved software. The quantities provided for each proton and antiproton bunch include the intensity, the longitudinal bunch profile, the timing of the bunch with respect to the low-level RF, the momentum spread and the longitudinal emittance. The system is capable of 2 Hz operation and is run at 1 Hz.
We have studied the
3P
J
(
χ
c
) states of charmonium in formation by antiproton–proton annihilations in experiment E835 at the Fermilab Antiproton Source. We report new measurements of the mass, ...width, and
B
(
χ
c
J
→
p
¯
p
)
Γ
(
χ
c
J
→
J
/
ψ
+
anything
)
for the
χ
c
1
and
χ
c
2
by means of the inclusive reaction
p
¯
p
→
χ
c
J
→
J
/
ψ
+
anything
→
(
e
+
e
−
)
+
anything
. Using the subsample of events where
χ
c
J
→
γ
+
J
/
ψ
→
γ
+
(
e
+
e
−
)
is fully reconstructed, we derive
B
(
χ
c
J
→
p
¯
p
)
Γ
(
χ
c
J
→
J
/
ψ
+
γ
)
. We summarize the results of the E760 (updated) and E835 measurements of mass, width and
B
(
χ
c
J
→
p
¯
p
)
Γ
(
χ
c
J
→
J
/
ψ
+
γ
)
(
J
=
0
,
1
,
2
) and discuss the significance of these measurements.
We report on the decay to two photons of the χc0(13P0) charmonium resonance formed in p̄p interactions at Fermilab experiment E835. We have measured the product of branching ratios ...BR(χc0→p̄p)×BR(χc0→γγ)=(6.52±1.18(stat)+0.48−0.72(sys))×10−8. Using values from the 2002 PDG, this measurement leads to the partial width Γ(χc0→γγ)=2.9±0.9 keV.
This paper discusses the implementation of abort gap beam intensity monitoring at the Tevatron collider at Fermilab. There are two somewhat independent monitors which measure the intensity of the ...synchrotron light emitted by particles in the abort gaps. One system uses a gated Photomultiplier Tube (PMT) to measure the light intensity, and the other system uses a single lens telescope, gated image intensifier, and Charge Injection Device (CID) camera to image the beam.
Fermilab experiment E835 has observed (-)pp annihilation production of the charmonium state chi(c0) and its subsequent decay into pi(0)pi(0). Although the resonant amplitude is an order of magnitude ...smaller than that of the nonresonant continuum production of pi(0)pi(0), an enhanced interference signal is evident. A partial wave expansion is used to extract physics parameters. The amplitudes J=0 and 2, of comparable strength, dominate the expansion. Both are accessed by L=1 in the entrance (-)pp channel. The product of the input and output branching fractions is determined to be B((-)pp-->chi(c0))xB(chi(c0)-->pi(0)pi(0))=(5.09+/-0.81+/-0.25)x10(-7).
The resonance parameters of the charmonium ground state, ηc(11S0), have been measured by means of the reaction p̄p→ηc→γγ. The mass and total width are determined to be 2984.1±2.1±1.0 MeV/c2 and ...20.4+7.7−6.7±2.0 MeV, respectively. The product of branching ratios B(p̄p→ηc)B(ηc→γγ) is determined to be 22.4+3.8−3.7±2.0×10−8, from which B(ηc→γγ)=1.87+0.32+0.95−0.31−0.50×10−4, and Γ(ηc→γγ)=3.8+1.1+1.9−1.0−1.0 keV are derived using B(ηc→p̄p)=(12±4)×10−4 from the literature.
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