Papers by Cyrus C. Taylor
Nuclear Physics B - Proceedings Supplements, 1999
The FELIX collaboration has proposed the construction of a full acceptance detector for the LHC, ... more The FELIX collaboration has proposed the construction of a full acceptance detector for the LHC, to be located at Intersection Region 4, and to be commissioned concurrently with the LHC. The primary mission of FELIX is QCD: to provide comprehensive and definitive observations of a very broad range of strong-interaction processes. This paper reviews the detector concept and performance characteristics, the physics menu, and plans for integration of FELIX into the collider lattice and physical environment. The current status of the FELIX Letter of Intent is discussed.
EPL (Europhysics Letters), 2011
TOTEM has measured the differential cross-section for elastic proton-proton scattering at the LHC... more TOTEM has measured the differential cross-section for elastic proton-proton scattering at the LHC energy of √ s = 7 TeV analysing data from a short run with dedicated large β * optics. A single exponential fit with a slope B = (20.1 ± 0.2 stat ± 0.3 syst) GeV −2 describes the range of the fourmomentum transfer squared |t| from 0.02 to 0.33 GeV 2. After the extrapolation to |t| = 0, a total elastic scattering cross-section of (24.8 ± 0.2 stat ± 1.2 syst) mb was obtained. Applying the optical theorem and using the luminosity measurement from CMS, a total proton-proton cross-section of (98.3 ± 0.2 stat ± 2.8 syst) mb was deduced which is in good agreement with the expectation from the overall fit of previously measured data over a large range of center-of-mass energies. From the total and elastic pp cross-section measurements, an inelastic pp cross-section of (73.5±0.6 stat +1.8 −1.3 syst) mb was inferred.
EPL (Europhysics Letters), 2011
Proton-proton elastic scattering has been measured by the TOTEM experiment at the CERN Large Hadr... more Proton-proton elastic scattering has been measured by the TOTEM experiment at the CERN Large Hadron Collider at √ s = 7 TeV in dedicated runs with the Roman Pot detectors placed as close as seven times the transverse beam size (σ beam) from the outgoing beams. After careful study of the accelerator optics and the detector alignment, |t| , the square of four-momentum transferred in the elastic scattering process, has been determined with an uncertainty of δt = 0.1 GeV √ |t|. In this letter the first results of the differential cross section are presented covering a |t|-range from 0.36 to 2.5 GeV 2. The differential cross-section in the range 0.36 < |t| < 0.47 GeV 2 is described by an exponential with a slope parameter B = (23.6 ± 0.5 stat ± 0.4 syst) GeV −2 , followed by a significant diffractive minimum at |t| = (0.53 ± 0.01 stat ± 0.01 syst) GeV 2. For |t|-values larger than ∼ 1.5 GeV 2 , the cross-section exhibits a power law behaviour with an exponent of-7.8 ± 0.3 stat ± 0.1 syst. When compared to predictions based on the different available models, the data show a strong discriminative power despite the small t-range covered.
TOTEM early measurements
The status of the TOTEM experiment is described as well as the prospects for the measurements in ... more The status of the TOTEM experiment is described as well as the prospects for the measurements in the early LHC runs. The primary goal of TOTEM is the measurement of the total p-p cross section, using a method independent of the luminosity. A final accuracy of 1% is expected with dedicated β∗ = 1540 m runs, while at the beginning a 5% resolution is achievable with a β∗ = 90 m optics. Accordingly to the running scenarios TOTEM will be able to measure the elastic scattering in a wide range of t and to study the cross-sections and the topologies of diffractive events. In a later stage, physics studies will be extended to low-x and forward physics collaborating with CMS as a whole experimental apparatus.
Physical Review D, 1993
Four-dimensional heavy-fermion QED is studied in light-cone coordinates with (anti-)periodic fiel... more Four-dimensional heavy-fermion QED is studied in light-cone coordinates with (anti-)periodic field boundary conditions. We carry out a consistent light-cone canonical quantization of this model using the Dirac algorithm for a system with first-and second-class constraints. To examine the role of the zero modes, we consider the quantization procedure in the zero-mode and the non-zero-mode sectors separately. In both sectors we obtain the physical variables and their canonical commutation relations. The physical Hamiltonian is constructed via a step-by-step exclusion of the unphysical degrees of freedom. An example using this Hamiltonian in which the zero modes play a role is the verification of the correct Coulomb potential between two heavy fermions.
Nuclear Physics B, 2015
The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cro... more The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy √ s = 8 TeV based on a high-statistics data sample obtained with the β * = 90 m optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. This unprecedented precision allows to exclude a purely exponential differential cross-section in the range of four-momentum transfer squared 0.027 < |t| < 0.2 GeV 2 with a significance greater than 7 σ. Two extended parametrisations, with quadratic and cubic polynomials in the exponent, are shown to be well compatible with the data. Using them for the differential cross-section extrapolation to t = 0, and further applying the optical theorem, yields total crosssection estimates of (101.5 ± 2.1) mb and (101.9 ± 2.1) mb, respectively, in agreement with previous TOTEM measurements.
Progress of Theoretical Physics Supplement, 2011
The TOTEM experiment at the LHC is dedicated to the measurement of the total pp cross section and... more The TOTEM experiment at the LHC is dedicated to the measurement of the total pp cross section and to the study of elastic scattering and of diffractive dissociation processes. TOTEM is here presented with a general overview on the main features of its experimental apparatus and of its physics programme.
Physics Letters B, 1987
We study the canonical structure of string field theory in midpoint coordinates. We find the cons... more We study the canonical structure of string field theory in midpoint coordinates. We find the constraint algebra, which consists of second class constraints, together with dependent first class constraints. Exploiting properties of the relevant operators, we show that the constraint algebra is the same in the interacting theory as in the free theory, at least on Fock-space states. We discuss the gauge transformations generated by the first class constraints, and show that they can be used to gauge away unphysical fields.
Supergravity torsion constraints from the 10D superparticle
Physics Letters B, 1986
The classical superparticle propagating in a curved superspace is studied. Requiring that there b... more The classical superparticle propagating in a curved superspace is studied. Requiring that there be a local fermionic symmetry imposes restrictions on the background. The equivalence relation among background superfields which is implied by the superparticle dynamics is discussed, and it is shown that up to such equivalences the torsion superfields obey the supergravity constraints.
Quantizing compact phase spaces: Irreducible representations from constrained dynamics
Physical Review Letters, 1989
Evalyn Gates, Robertus Potting, Cyrus Taylor, and Boris Velikson Department of Physics, Case West... more Evalyn Gates, Robertus Potting, Cyrus Taylor, and Boris Velikson Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106 (1) Service de Physique Théorique, Université Libre de Bruxelles, CP 225, 1050 Bruxelles, Beldium (2) Laboratoire de Physique ...
Physical Review Letters, 2005
We propose a new test statistic based on a score process for determining the statistical signific... more We propose a new test statistic based on a score process for determining the statistical significance of a putative signal that may be a small perturbation to a noisy experimental background. We derive the reference distribution for this score test statistic; it has an elegant geometrical interpretation as well as broad applicability. We illustrate the technique in the context of a model problem from high-energy particle physics. Monte Carlo experimental results confirm that the score test results in a significantly improved rate of signal detection.
Nuclear Physics B - Proceedings Supplements, 1997
Plans for FELIX, a full acceptance detector for the future CERN Large Hadron Collider (LHC), are ... more Plans for FELIX, a full acceptance detector for the future CERN Large Hadron Collider (LHC), are described. The physics goals include detailed studies of the strong interactions (QCD), the forward energy flow and diffractive processes (Pomeron interactions), electroweak rapidity gaps, and elastic scattering. The precise measurement of particle production at a centre-of-mass energy of 14 TeV, well above the cosmic ray "knee", will be fundamental for the interpretation of the highest energy cosmic ray events and may clarify some of the anomalies indicated by some cosmic ray experiments. The magnetic architecture and some of the design issues are briefly reviewed.
Nuclear Physics B, 1989
We study the transformation to midpoint coordinates in Witten's string field theory using a ~'-fu... more We study the transformation to midpoint coordinates in Witten's string field theory using a ~'-function regularization. We find that the vertex is well defined and local (in that it makes no explicit reference to the midpoint coordinate) as the regulator is removed. This is in contrast to the heat-kernel regularization previously studied by others. We interpret the locality and unitarity anomalies of the heat-kernel regularization in terms of the associativity anomaly of the vertex. We also study the BRST charge in the same limit, verify that it is well defined, and propose a sense in which it is nilpotent. We then argue that the transformed vertex is BRST invariant. We discuss the structure of the space of states in the transformed theory; physical states are singular as the regulator is removed, suggesting that they be interpreted in a distributional sense.
Arxiv preprint arXiv: …, 2011
Abstract: The first physics results from the TOTEM experiment are here reported, concerning the m... more Abstract: The first physics results from the TOTEM experiment are here reported, concerning the measurements of the total, differential elastic, elastic and inelastic pp cross-section at the LHC energy of $\ sqrt {s} $= 7 TeV, obtained using the luminosity measurement from CMS. ...
Harmonic analysis of the relativistic string in spinorial coordinates
Classical and Quantum Gravity, 1991
Page 1. Harmonic analysis of the relativistic string in spinorial coordinates This article has be... more Page 1. Harmonic analysis of the relativistic string in spinorial coordinates This article has been downloaded from IOPscience. Please scroll down to see the full text article. 1991 Class. Quantum Grav. 8 1245 (http://iopscience.iop.org/0264-9381/8/7/003) ...
A Chern-Simons-like action for closed-string field theory
Classical and Quantum Gravity, 1989
A Chern-Simons-like action is proposed for closed-string field theory. The action involves auxili... more A Chern-Simons-like action is proposed for closed-string field theory. The action involves auxiliary fields of arbitrary ghost number and is defined in terms of the closed-string operations integral , Q and, analogous to those introduced by Witten (1986) in the construction of open-string field theory. The action is an extension of one proposed for free closed strings and bears a
Arxiv preprint hep-ph/9309235, 1993
We speculate that, in very high energy hadronic collisions, large fireballs may be produced with ... more We speculate that, in very high energy hadronic collisions, large fireballs may be produced with interiors which have anomalous chiral order parameters. Such a process would result in radiation of pions with distinctive momentum and isospin distributions, and may provide an explanation of Centauro and related phenomena in cosmic-ray events. The phenomenology of such events is reviewed, with emphasis on the possibility of observing such phenomena at Fermilab experiment T-864 (MiniMax), or at a Full Acceptance Detector (FAD) at the SSC.
Physics Reports, 1990
The superparticle in background supergravitational 1. Introduction 223 fields 258 2. Classical su... more The superparticle in background supergravitational 1. Introduction 223 fields 258 2. Classical superparticles and the twistor transform 225 3. The superstring in curved superspace 269 2.1. Constrained dynamics of massless particles 225 3.1. The superstring action 270 2.2. A first look at the superparticle 228 3.2. The constraints in "flat" superspace 276 2.3. Superspace 229 3.3. The first-class constraints in curved space 277 2.4. Constrained dynamics of the superparticle 234 4. Recent developments 280 2.5. The superparticle in background Yang-Mills fields 239 Appendix A. Gamma matrices 282 2.6. Constraint equations and the super-Yang-Mills equa-Al. The Dirac algebra 282 tions of motion 247 A.2. Fierz identities 284 2.7. The ten-dimensional twistor transform 252 References 286
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Papers by Cyrus C. Taylor