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2010

Syracuse University

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Articles 1 - 30 of 80

Full-Text Articles in Physical Sciences and Mathematics

Upsilon(1s)->Gamma+F2'(1525); F2'(1525)->K0sk0s Decays, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki Dec 2010

Upsilon(1s)->Gamma+F2'(1525); F2'(1525)->K0sk0s Decays, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki

Physics - All Scholarship

We report on a study of exclusive radiative decays of the Upsilon(1S) resonance into a final state consisting of a photon and two K0s candidates. We find evidence for a signal for Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K0sK0s, at a rate (4.0+/-1.3+/-0.6)x10^{-5}, consistent with previous observations of Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of Upsilon(1S)->gamma f_2'(1525) and J/psi->gamma f_2'(1525), we obtain the ratio of branching fractions: B(Upsilon(1S)->gamma f_2'(1525))/B(J/psi->gamma f_2'(1525))=0.09+/-0.02, approximately consistent with expectations based on soft collinear effective theory.

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ϒ(1s)→Γf'2(1525); F'2(1525)->K0sk0s Decays, Raymond Mountain, Marina Artuso, T. Skwarnicki, S. Stone Dec 2010

ϒ(1s)→Γf'2(1525); F'2(1525)->K0sk0s Decays, Raymond Mountain, Marina Artuso, T. Skwarnicki, S. Stone

Physics - All Scholarship

We report on a study of exclusive radiative decays of the Upsilon(1S) resonance into a final state consisting of a photon and two K0s candidates. We find evidence for a signal for Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K0sK0s, at a rate (4.0+/-1.3+/-0.6)x10^{-5}, consistent with previous observations of Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of Upsilon(1S)->gamma f_2'(1525) and J/psi->gamma f_2'(1525), we obtain the ratio of branching fractions: B(Upsilon(1S)->gamma f_2'(1525))/B(J/psi->gamma f_2'(1525))=0.09+/-0.02, approximately consistent with expectations based on soft collinear effective theory.

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Crystalline Order On Catenoidal Capillary Bridges, Mark Bowick, Zhenwei Yao Dec 2010

Crystalline Order On Catenoidal Capillary Bridges, Mark Bowick, Zhenwei Yao

Physics - All Scholarship

We study the defect structure of crystalline particle arrays on negative Gaussian curvature capillary bridges with vanishing mean curvature (catenoids). The threshold aspect ratio for the appearance of isolated disclinations is found and the optimal positions for dislocations determined. We also discuss the transition from isolated disclinations to scars as particle number and aspect ratio are varied.

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Crystalline Order On Catenoidal Capillary Bridges, Mark Bowick, Zhenwei Yao Dec 2010

Crystalline Order On Catenoidal Capillary Bridges, Mark Bowick, Zhenwei Yao

Physics - All Scholarship

We study the defect structure of crystalline particle arrays on negative Gaussian curvature capillary bridges with vanishing mean curvature (catenoids). The threshold aspect ratio for the appearance of isolated disclinations is found and the optimal positions for dislocations determined. We also discuss the transition from isolated disclinations to scars as particle number and aspect ratio are varied.

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Chaos And Universality In Two-Dimensional Ising Spin Glasses, Alan Middleton, Creighton K. Thomas, David A. Huse Dec 2010

Chaos And Universality In Two-Dimensional Ising Spin Glasses, Alan Middleton, Creighton K. Thomas, David A. Huse

Physics - All Scholarship

Recently extended precise numerical methods and droplet scaling arguments allow for a coherent picture of the glassy states of two-dimensional Ising spin glasses to be assembled. The length scale at which entropy becomes important and produces "chaos", the extreme sensitivity of the state to temperature, is found to depend on the type of randomness. For the $\pm J$ model this length scale dominates the low-temperature specific heat. Although there is a type of universality, some critical exponents do depend on the distribution of disorder.

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Warped Product Einstein Metrics Over Spaces With Constant Scalar Curvature, Chenxu He, Peter Petersen, William Wylie Dec 2010

Warped Product Einstein Metrics Over Spaces With Constant Scalar Curvature, Chenxu He, Peter Petersen, William Wylie

Mathematics - All Scholarship

In this paper we study warped product Einstein metrics over spaces with constant scalar curvature. We call such a manifold rigid if the universal cover of the base is Einstein or is isometric to a product of Einstein manifolds. When the base is three dimensional and the dimension of the fiber is greater than one we show that the space is always rigid. We also exhibit examples of solvable four dimensional Lie groups that can be used as the base space of non-rigid warped product Einstein metrics showing that the result is not true in dimension greater than three. We …

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Do Cosmological Perturbations Have Zero Mean?, Christian Armendariz-Picon Dec 2010

Do Cosmological Perturbations Have Zero Mean?, Christian Armendariz-Picon

Physics - All Scholarship

A central assumption in our analysis of cosmic structure is that cosmological perturbations have zero ensemble mean. This property is one of the consequences of statistically homogeneity, the invariance of correlation functions under spatial translations. In this article we explore whether cosmological perturbations indeed have zero mean, and thus test one aspect of statistical homogeneity. We carry out a classical test of the zero mean hypothesis against a class of alternatives in which perturbations have non-vanishing means, but homogeneous and isotropic covariances. Apart from Gaussianity, our test does not make any additional assumptions about the nature of the perturbations and …

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Isomer-Dependent Adsorption And Release Of Cis- And Trans-Platin Anticancer Drugs By Mesopomus Silica Nanoparticles, Zhimin Tao, Youwei Xie, Jerry Goodisman, Tewodros Asefa Dec 2010

Isomer-Dependent Adsorption And Release Of Cis- And Trans-Platin Anticancer Drugs By Mesopomus Silica Nanoparticles, Zhimin Tao, Youwei Xie, Jerry Goodisman, Tewodros Asefa

Chemistry - All Scholarship

We report on adsorption and release of the anticancer drugs cisplatin and transplatin from mesoporous silica nanomaterials, emphasizing the differences between cisplatin and its much less toxic isomer. Two types of particles, M.CM-41 and SBA-IS, were used, either as just synthesized or after calcination to remove the templates. The particles were characterized by TEM, nitrogen physisorption, and elemental analysis. The UV-vis spectra of cisplatin and transplatin were obtained and the intensities of several bands (205-210 nm, 210-220 nm, 220-235 nm, and 300-330 nm) were found proportional to drug concentrations, allowing their use for measuring drug concentration. To evaluate drug adsorption …

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Burkholder Integrals, Morrey's Problem And Quasiconformal Mappings, Kari Astala, Tadeusz Iwaniec, Istvan Prause, Eero Saksman Dec 2010

Burkholder Integrals, Morrey's Problem And Quasiconformal Mappings, Kari Astala, Tadeusz Iwaniec, Istvan Prause, Eero Saksman

Mathematics - All Scholarship

Inspired by Morrey's Problem (on rank-one convex functionals) and the Burkholder integrals (of his martingale theory) we find that the Burkholder functionals Bp, p > 2, are quasiconcave, when tested on deformations of identity f in Id+Coinifinty (omega) with Bp (Df(x)) > 0 pointwise, or equivalently, deformations such that abs[Df]2 < (p/(p-2))Jf. In particular, this holds in explicit neighbourhoods of the identity map. Among the many immediate consequences, this gives the strongest possible Lp-estimates for the gradient of a principal solution to the Beltrami equation fz = mu(z)fz , for any p in …

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Model-Independent Determination Of The Strong-Phase Difference Between D0 And D0 → K0s,L H+H- (H=Π,K) And Its Impact On The Measurement Of The Ckm Angle Γ/Φ3, Raymond Mountain, Marina Artuso, S. Blusk, N. Horwitz Nov 2010

Model-Independent Determination Of The Strong-Phase Difference Between D0 And D0 → K0s,L H+H- (H=Π,K) And Its Impact On The Measurement Of The Ckm Angle Γ/Φ3, Raymond Mountain, Marina Artuso, S. Blusk, N. Horwitz

Physics - All Scholarship

We report the first determination of the relative strong-phase difference between D^0 -> K^0_S,L K^+ K^- and D^0-bar -> K^0_S,L K^+ K^-. In addition, we present updated measurements of the relative strong-phase difference between D^0 -> K^0_S,L pi^+ pi^- and D^0-bar -> K^0_S,L pi^+ pi^-. Both measurements exploit the quantum coherence between a pair of D^0 and D^0-bar mesons produced from psi(3770) decays. The strong-phase differences measured are important for determining the Cabibbo-Kobayashi-Maskawa angle gamma/phi_3 in B^- -> K^- D^0-tilde decays, where D^0-tilde is a D^0 or D^0-bar meson decaying to K^0_S h^+ h^- (h=pi,K), in a manner independent of …

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Model-Independent Determination Of The Strong-Phase Difference Between D^0 And D^0-Bar-> K^0_S,L H^+ H^- (H=Pi,K) And Its Impact On The Measurement Of The Ckm Angle Gamma/Phi_3, Raymond Mountain, Marina Artuso, S. Blusk, N. Horwitz Nov 2010

Model-Independent Determination Of The Strong-Phase Difference Between D^0 And D^0-Bar-> K^0_S,L H^+ H^- (H=Pi,K) And Its Impact On The Measurement Of The Ckm Angle Gamma/Phi_3, Raymond Mountain, Marina Artuso, S. Blusk, N. Horwitz

Physics - All Scholarship

We report the first determination of the relative strong-phase difference between D^0 -> K^0_S,L K^+ K^- and D^0-bar -> K^0_S,L K^+ K^-. In addition, we present updated measurements of the relative strong-phase difference between D^0 -> K^0_S,L pi^+ pi^- and D^0-bar -> K^0_S,L pi^+ pi^-. Both measurements exploit the quantum coherence between a pair of D^0 and D^0-bar mesons produced from psi(3770) decays. The strong-phase differences measured are important for determining the Cabibbo-Kobayashi-Maskawa angle gamma/phi_3 in B^- -> K^- D^0-tilde decays, where D^0-tilde is a D^0 or D^0-bar meson decaying to K^0_S h^+ h^- (h=pi,K), in a manner independent of …

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The Hopf-Laplace Equation, Jan Cristina, Tadeusz Iwaniec, Leonid V. Kovalev, Jani Onninen Nov 2010

The Hopf-Laplace Equation, Jan Cristina, Tadeusz Iwaniec, Leonid V. Kovalev, Jani Onninen

Mathematics - All Scholarship

The central theme in this paper is the Hopf-Laplace equation, which represents stationary solutions with respect to the inner variation of the Dirichlet integral. Among such solutions are harmonic maps. Nevertheless, minimization of the Dirichlet energy among homeomorphisms often leads to nonharmonic solutions. We investigate the Hopf-Laplace equation for a certain class of topologically well behaved mappings which are almost homeomorphisms, called Hopf deformations. We establish Lipschitz continuity of Hopf deformations, the best possible regularity one can get. Thus in particular we show that the minimal-energy deformations are Lipschitz continuous, a result of considerable interest in the theory of minimal …

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Search For Rare And Forbidden Decays Of Charm And Charmed-Strange Mesons To Final States H+- E-+ E+, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki Nov 2010

Search For Rare And Forbidden Decays Of Charm And Charmed-Strange Mesons To Final States H+- E-+ E+, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki

Physics - All Scholarship

We have searched for flavor-changing neutral current decays and lepton-number-violating decays of D^+ and D^+_s mesons to final states of the form h^+- e^-+ e^+, where h is either \pi or K. We use the complete samples of CLEO-c open-charm data, corresponding to integrated luminosities of 818 pb^-1 at the center-of-mass energy E_CM = 3.774 GeV containing 2.4 x 10^6 D^+D^- pairs and 602 pb^-1 at E_CM = 4.170 GeV containing 0.6 x 10^6 D^*+-_s D^-+_s pairs. No signal is observed in any channel, and we obtain 90% confidence level upper limits on branching fractions B(D^+ --> \pi^+ e^+ e^-) …

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A Search For Gravitational Waves Associated With The August 2006 Timing Glitch Of The Vela Pulsar, Duncan Brown, J. Abadie Nov 2010

A Search For Gravitational Waves Associated With The August 2006 Timing Glitch Of The Vela Pulsar, Duncan Brown, J. Abadie

Physics - All Scholarship

The physical mechanisms responsible for pulsar timing glitches are thought to excite quasi-normal mode oscillations in their parent neutron star that couple to gravitational wave emission. In August 2006, a timing glitch was observed in the radio emission of PSR B0833-45, the Vela pulsar. At the time of the glitch, the two co-located Hanford gravitational wave detectors of the Laser Interferometer Gravitational-wave observatory (LIGO) were operational and taking data as part of the fifth LIGO science run (S5). We present the first direct search for the gravitational wave emission associated with oscillations of the fundamental quadrupole mode excited by a …

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Search For Rare And Forbidden Decays Of Charm And Charmed-Strange Mesons To Final States H^+- E^-+ E^+, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki Nov 2010

Search For Rare And Forbidden Decays Of Charm And Charmed-Strange Mesons To Final States H^+- E^-+ E^+, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki

Physics - All Scholarship

We have searched for flavor-changing neutral current decays and lepton-number-violating decays of D^+ and D^+_s mesons to final states of the form h^+- e^-+ e^+, where h is either \pi or K. We use the complete samples of CLEO-c open-charm data, corresponding to integrated luminosities of 818 pb^-1 at the center-of-mass energy E_CM = 3.774 GeV containing 2.4 x 10^6 D^+D^- pairs and 602 pb^-1 at E_CM = 4.170 GeV containing 0.6 x 10^6 D^*+-_s D^-+_s pairs. No signal is observed in any channel, and we obtain 90% confidence level upper limits on branching fractions B(D^+ --> \pi^+ e^+ e^-) …

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Roadmap For Selected Key Measurements Of Lhcb, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia Nov 2010

Roadmap For Selected Key Measurements Of Lhcb, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia

Physics - All Scholarship

Six of the key physics measurements that will be made by the LHCb experiment, concerning CP asymmetries and rare B decays, are discussed in detail. The "road map" towards the precision measurements is presented, including the use of control channels and other techniques to understand the performance of the detector with the first data from the LHC.

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Twisted Lattice Supersymmetry And Applications To Ads/Cft, Simon Catterall Oct 2010

Twisted Lattice Supersymmetry And Applications To Ads/Cft, Simon Catterall

Physics - All Scholarship

Review recent approaches to constructing supersymmetric lattice theories focusing in particular on the concept of topological twisting. The latter technique is shown to expose a nilpotent, scalar supersymmetry which can be implemented exactly in the lattice theory. Using these ideas a lattice action for \cN=4 super Yang-Mills in four dimensions can be written down which is gauge invariant, free of fermion doublers and respects one out of a total of 16 continuum supersymmetries. It is shown how these exact symmetries together with the large point group symmetry of the lattice strongly constrain the possible counterterms needed to renormalize the theory …

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Mcrg Minimal Walking Technicolor, Simon Catterall, Luigi Del Debbio, Joel Giedt, Liam Keegan Oct 2010

Mcrg Minimal Walking Technicolor, Simon Catterall, Luigi Del Debbio, Joel Giedt, Liam Keegan

Physics - All Scholarship

We present a Monte Carlo renormalisation group study of the SU(2) gauge theory with two Dirac fermions in the adjoint representation. Using the two lattice matching technique recently advocated and exploited in [arXiv:0907.0919], we measure the running of the coupling and the anomalous mass dimension.

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Three Dimensional Lattice Gravity As Supersymmetric Yang-Mills Theory, Simon Catterall Oct 2010

Three Dimensional Lattice Gravity As Supersymmetric Yang-Mills Theory, Simon Catterall

Physics - All Scholarship

We argue that a certain twisted supersymmetric Yang-Mills theory in three dimensions with gauge group SU(2) possesses a set of topological observables whose expectation values can be computed in a related Chern Simons theory. This Chern Simons theory has been proposed as a definition of three dimensional Euclidean quantum gravity. Since the YM theory admits a discretization which preserves the values of topological observables we conjecture that it can be used as a non-perturbative definition of the quantum gravity theory.

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On Gradings In Khovanov Homology And Sutured Floer Homology, J. Elisenda Grigsby, Stephan M. Wehrli Oct 2010

On Gradings In Khovanov Homology And Sutured Floer Homology, J. Elisenda Grigsby, Stephan M. Wehrli

Mathematics - All Scholarship

We discuss generalizations of Ozsvath-Szabo's spectral sequence relating Khovanov homology and Heegaard Floer homology, focusing attention on an explicit relationship between natural Z (resp., 1/2 Z) gradings appearing in the two theories. These two gradings have simple representation-theoretic (resp., geometric) interpretations, which we also review.

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Study Of Ψ(2s) Decays To Γpp, Π0pp And Η Pp And Search For Pp Threshold Enhancements, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki Oct 2010

Study Of Ψ(2s) Decays To Γpp, Π0pp And Η Pp And Search For Pp Threshold Enhancements, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki

Physics - All Scholarship

The decays of psi(2S) into gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been studied with the CLEO-c detector using a sample of 24.5 million psi(2S) events obtained from e^+e^- annihilations at sqrt{s} = 3686 MeV. The data show evidence for the excitation of several N^* resonances in p pi^0 and p eta channels in pi^0 p bar{p} and eta p bar{p} decays, and f_2 states in gamma p bar{p} decay. Branching fractions for decays of psi(2S) to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been determined. No evidence for p bar{p} threshold …

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Study Of Psi(2s) Decays To Gamma P Bar{P}, Pi^0 P Bar{P} And Eta P Bar{P} And Search For P Bar{P} Threshold Enhancements, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki Oct 2010

Study Of Psi(2s) Decays To Gamma P Bar{P}, Pi^0 P Bar{P} And Eta P Bar{P} And Search For P Bar{P} Threshold Enhancements, Raymond Mountain, Marina Artuso, S. Blusk, T. Skwarnicki

Physics - All Scholarship

The decays of psi(2S) into gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been studied with the CLEO-c detector using a sample of 24.5 million psi(2S) events obtained from e^+e^- annihilations at sqrt{s} = 3686 MeV. The data show evidence for the excitation of several N^* resonances in p pi^0 and p eta channels in pi^0 p bar{p} and eta p bar{p} decays, and f_2 states in gamma p bar{p} decay. Branching fractions for decays of psi(2S) to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been determined. No evidence for p bar{p} threshold …

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Interaction Of Atomic And Molecular Hydrogen With Tholin Surfaces At Low Temperatures, Gianfranco Vidali, Ling Li, Hui Zhao Oct 2010

Interaction Of Atomic And Molecular Hydrogen With Tholin Surfaces At Low Temperatures, Gianfranco Vidali, Ling Li, Hui Zhao

Physics - All Scholarship

We study the interaction of atomic and molecular hydrogen with a surface of tholin, a man-made polymer considered to be an analogue of aerosol particles present in Titan's atmosphere, using thermal programmed desorption at low temperatures below 30 K. The results are fitted and analyzed using a fine-grained rate equation model that describes the diffusion, reaction and desorption processes. We obtain the energy barriers for diffusion and desorption of atomic and molecular hydrogen. These barriers are found to be in the range of 30 to 60 meV, indicating that atom/molecule-surface interactions in this temperature range are dominated by weak adsorption …

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Measurement Of Σ(Pp -> Bb-X) At √S=7 Tev In The Forward Region, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia Oct 2010

Measurement Of Σ(Pp -> Bb-X) At √S=7 Tev In The Forward Region, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia

Physics - All Scholarship

Decays of b hadrons into final states containing a D0 meson and a muon are used to measure the b anti-b production cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. In the pseudorapidity interval 2 < eta < 6 and integrated over all transverse momenta we find that the average cross-section to produce b-flavoured or anti-b-flavoured hadrons is (75.3 +/- 5.4 +/- 13.0) microbarns.

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Measurement Of Sigma(Pp -> B Anti-B X) At \Sqrt(S)=7 Tev In The Forward Region, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia Oct 2010

Measurement Of Sigma(Pp -> B Anti-B X) At \Sqrt(S)=7 Tev In The Forward Region, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia

Physics - All Scholarship

Decays of b hadrons into final states containing a D0 meson and a muon are used to measure the b anti-b production cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. In the pseudorapidity interval 2 < eta < 6 and integrated over all transverse momenta we find that the average cross-section to produce b-flavoured or anti-b-flavoured hadrons is (75.3 +/- 5.4 +/- 13.0) microbarns.

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Instabilities And Oscillations In Isotropic Active Gels, Shiladitya Banerjee, M. Cristina Marchetti Oct 2010

Instabilities And Oscillations In Isotropic Active Gels, Shiladitya Banerjee, M. Cristina Marchetti

Physics - All Scholarship

We present a generic formulation of the continuum elasticity of an isotropic crosslinked active gel. The gel is described by a two-component model consisting of an elastic network coupled frictionally to a permeating fluid. Activity is induced by active crosslinkers that undergo an ATP-activated cycle and transmit forces to the network. The on/off dynamics of the active crosslinkers is described via rate equations for unbound and bound motors. For large activity motors yield a contractile instability of the network. At smaller values of activity, the on/off motor dynamics provides an effective inertial drag on the network that opposes elastic restoring …

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Gauge Theory Duals Of Black Hole - Black String Transitions Of Gravitational Theories On A Circle, Simon Catterall, Anosh Joseph, Toby Wiseman Sep 2010

Gauge Theory Duals Of Black Hole - Black String Transitions Of Gravitational Theories On A Circle, Simon Catterall, Anosh Joseph, Toby Wiseman

Physics - All Scholarship

We study the black hole - black string phase transitions of gravitational theories compactified on a circle using the holographic duality conjecture. The gauge theory duals of these theories are maximally supersymmetric and strongly coupled 1 + 1 dimensional SU(N) Yang-Mills theories compactified on a circle, in the large N limit. We perform the strongly coupled finite temperature gauge theory calculations on a lattice, using the recently developed exact lattice supersymmetry methods based on topological twisting and orbifolding. The spatial Polyakov line serves as relevant order parameter of the confinement - deconfinement phase transitions in the gauge theory duals.

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Thermal Phases Of D1-Branes On A Circle From Lattice Super Yang-Mills, Simon Catterall, Anosh Joseph, Toby Wiseman Sep 2010

Thermal Phases Of D1-Branes On A Circle From Lattice Super Yang-Mills, Simon Catterall, Anosh Joseph, Toby Wiseman

Physics - All Scholarship

We report on the results of numerical simulations of 1+1 dimensional SU(N) Yang-Mills theory with maximal supersymmetry at finite temperature and compactified on a circle. For large N this system is thought to provide a dual description of the decoupling limit of N coincident D1-branes on a circle. It has been proposed that at large N there is a phase transition at strong coupling related to the Gregory-Laflamme (GL) phase transition in the holographic gravity dual. In a high temperature limit there was argued to be a deconfinement transition associated to the spatial Polyakov loop, and it has been proposed …

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Prompt K0s Production In Pp Collisions At √S=0.9 Tev, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia Sep 2010

Prompt K0s Production In Pp Collisions At √S=0.9 Tev, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia

Physics - All Scholarship

The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined using a novel technique, involving measurements of the beam currents, sizes and positions, and is found to be 6.8 +/- 1.0 microbarn^-1. The differential prompt K_short production cross-section is measured as a function of the K_short transverse momentum and rapidity in the region 0 < pT < 1.6 GeV/c and 2.5 < y < 4.0. The data are found to be in reasonable agreement with previous measurements and generator expectations.

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Prompt K_Short Production In Pp Collisions At Sqrt(S)=0.9 Tev, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia Sep 2010

Prompt K_Short Production In Pp Collisions At Sqrt(S)=0.9 Tev, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia

Physics - All Scholarship

The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined using a novel technique, involving measurements of the beam currents, sizes and positions, and is found to be 6.8 +/- 1.0 microbarn^-1. The differential prompt K_short production cross-section is measured as a function of the K_short transverse momentum and rapidity in the region 0 < pT < 1.6 GeV/c and 2.5 < y < 4.0. The data are found to be in reasonable agreement with previous measurements and generator expectations.

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