122515730
BRST Analysis of Physical States for 2D (Super) Gravity Coupled to (Super) Conformal Matter
We summarize some recent results on the BRST analysis of physical states of 2D gravity coupled to c≤ 1 conformal matter and the supersymmetric generalization.
2823704
BV Structure of the Cohomology of Nilpotent Subalgebras and the Geometry of(W) Strings
AbstractGiven a simple, simply laced, complex Lie algebra 
$$\mathfrak{g}$$
corresponding to the Lie group G, let 
$$\mathfrak{n}_ + $$
 be thesubalgebra generated by the positive roots. In this Letter we construct aBV algebra 
$${\text{BV}}[\mathfrak{g}]$$
 whose underlying graded commutative algebra is given by the cohomology, with respect to 
$$\mathfrak{n}_ + $$
, of the algebra of regular functions on G with values in 
$$ \wedge (\mathfrak{n}_ + \backslash \mathfrak{g})$$
. We conjecture that 
$${\text{BV}}[\mathfrak{g}]$$
 describes the algebra of allphysical (i.e., BRST invariant) operators of the noncritical 
$$\mathcal{W}[\mathfrak{g}]$$
string. The conjecture is verified in the two explicitly known cases,
$$\mathfrak{g} = \mathfrak{s}\mathfrak{l}$$
2 (the Virasoro string) and 
$$\mathfrak{g} = \mathfrak{s}\mathfrak{l}$$
3 (the 
$$\mathcal{W}_3 $$
 string).
120560048
Free Field Approach to 2-Dimensional Conformal Field Theories
11851007
Fusing the coordinates of quantum superspace
Abstract We introduce the notion of a fused quantum superplane by allowing for terms θθ ∼ x in the defining relations. We develop the differential calculus for a large class of fused quantum superplanes related to particular solutions of the Yang-Baxter equation.
122808498
Covariant field theory of the compactified closed bosonic string
We covariantly first-quantize, via the BRST approach, the closed bosonic string compactified on a torus — in particular the 18-dimensional theory with E8 × E8 gauge bosons. Further, we give the corresponding free field theory. Thus the model is ready for the introduction of string interactions, and may be very useful for the study of gauge interactions in string theories.
122935088
Minimal models on Riemann surfaces
Abstract We extend the Coulomb gas representation of minimal model correlation functions to higher genius Riemann surfaces. Specifically, we incorporate the “BRS” structure of this representation into the operator formalism. This allows traces over the spectrum of a minimal model to be computed from traces over Fock spaces of a free scalar field. This our results are obtained by standard sewing techniques. The formulation is general, but we present here in particular the two-loop characters of the Ising model.
125859668
High-spin states of Jpi=12-, 14- in Pb-208 studied by (e, e-prime)
123269422
Recent results from b-baryon decays at LHCb
Recent measurements of b-baryon decays using 3fb−1 proton-proton collision data collected by the LHCb experiment are presented. Measurements of the branching fractions of Λ0b → J/ψpπ−, Λ0b → Λ+c D−s, Λ0b → Λ+cD− and Λ0b → Λ+cπ− decays have been made, as well as precise measurements of the mass and lifetime of the Ξ0b Hb baryon. In addition, the pT and η dependence of the ratio of Λ0b to B0 production fractions has been measured.
197532158
Search for the rare decay $D^0 \to \mu^+ \mu^-$
A search for the rare decay $D^0 \to \mu^+ \mu^-$is performed using a data sample, corresponding to an integrated luminosity of 0.9 fb$^{-1}$, of $pp$ collisions collected at a centre-of-mass energy of 7 TeV by the LHCb experiment. The observed number of events is consistent with the background expectations and corresponds to an upper limit of \mbox{${\cal B}(D^0 \to \mu^+ \mu^-) < 6.2(7.6) \times 10^{-9}$} at \mbox{90%} \mbox{(95%)} confidence level. This result represents an improvement of more than a factor twenty with respect to previous measurements.
122523656
A large Streamer Chamber muon tracking detector in a high-flux fixed-target application
Arrays of limited streamer tubes of the Iarocci type were deployed in our experiment at CERN as part of a forward muon detector system with provisions for the beam to pass through the center of each panel in the array. A total of 16 4 m x 4 m panels were assembled with inductive readout strips on both sides of each panel. An active feedback system. was deployed to regulate the high voltage to the streamer tubes to insure a constant efficiency for minimum ionizing particles. The arrays were operated in this environment for over five years of data taking. Streamer tube track-reconstruction efficiencies and tube replacement rates are reported. (C) 1999 Elsevier Science B.V. All rights reserved.
28824306
The TEV I Beam Position Monitor System
The TeV I Beam Position Monitor System is described. This system is designed to provide accurate orbit information during both the commissioning and operational phases of the Fermilab Antiproton Source. The system is required to provide position information with submillimeter resolution for both single turn orbit measurements with beam intensities in the range 1×109 to 1×1011, and multiple turn (closed orbit) measurements with beam intensities in the range 1×107 to 5×1011. The system has already been used during commissioning of the Debuncher to measure the first turn through the ring, the horizontal and vertical betatron tunes, the closed orbit, the dispersion, aperture, and chromaticity. During normal antiproton operation the system will be used to monitor beam position throughout the accumulation process.