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Articles 1 - 16 of 16
Full-Text Articles in Physics
Direct Photons As Probes Of Low Mass Strings At The Lhc, Luis Anchordoqui, Haim Goldberg, Satoshi Nawata, Tomasz Taylor
Direct Photons As Probes Of Low Mass Strings At The Lhc, Luis Anchordoqui, Haim Goldberg, Satoshi Nawata, Tomasz Taylor
Tomasz Taylor
The LHC program will include the identification of events with single prompt high-k_\perp photons as probes of new physics. We show that this channel is uniquely suited to search for experimental evidence of TeV-scale open string theory. At the parton level, we analyze single photon production in gluon fusion, gg \to \gamma g, with open string states propagating in intermediate channels. If the photon mixes with the gauge boson of the baryon number, which is a common feature of D-brane quivers, the amplitude appears already at the string disk level. It is completely determined by the mixing parameter (which is …
Dynamical Supersymmetry Breaking And The Linear Multiplet, P. Binétruy, M. K. Gaillard, T. R. Taylor
Dynamical Supersymmetry Breaking And The Linear Multiplet, P. Binétruy, M. K. Gaillard, T. R. Taylor
Tomasz Taylor
We analyze gaugino condensation in the presence of a dilaton and an antisymmetric tensor field, with couplings reminiscent of string theories. The degrees of freedom relevant to a supersymmetric description of the effective theory below the scale of condensation are discussed in this context.
Duality Of N = 2 Heterotic-Type I Compactifications In Four Dimensions, I. Antoniadis, H. Partouche, T. R. Taylor
Duality Of N = 2 Heterotic-Type I Compactifications In Four Dimensions, I. Antoniadis, H. Partouche, T. R. Taylor
Tomasz Taylor
We discuss type I -- heterotic duality in four-dimensional models obtained as a Coulomb phase of the six-dimensional U(16) orientifold model compactified on T^2 with arbitrary SU(16) Wilson lines. We show that Kahler potentials, gauge threshold corrections and the infinite tower of higher derivative F-terms agree in the limit that corresponds to weak coupling, large T^2 heterotic compactifications. On the type I side, all these quantities are completely determined by the spectrum of N=2 BPS states that originate from D=6 massless superstring modes.
Duality In Superstring Compactifications With Magnetic Field Backgrounds, I. Antoniadis, E. Gava, K. S. Narain, T. R. Taylor
Duality In Superstring Compactifications With Magnetic Field Backgrounds, I. Antoniadis, E. Gava, K. S. Narain, T. R. Taylor
Tomasz Taylor
Motivated by the work of Polchinski and Strominger on type IIA theory, where the effect of non-trivial field strengths for p-form potentials on a Calabi-Yau space was discussed, we study four-dimensional heterotic string theory in the presence of magnetic field on a 2-cycle in the internal manifold, for both N=4 and N=2 cases. We show that at special points in the moduli space, certain perturbative charged states become tachyonic and stabilize the vacuum by acquiring vacuum expectation values, thereby restoring supersymmetry. We discuss both the cases where the tachyons appear with a tower of Landau levels, which become light in …
Dijet Signals For Low Mass Strings At The Lhc, Luis A. Anchordoqui, Haim Goldberg, Dieter Lüst, Satoshi Nawata, Stephan Stieberger, Tomasz T. Taylor
Dijet Signals For Low Mass Strings At The Lhc, Luis A. Anchordoqui, Haim Goldberg, Dieter Lüst, Satoshi Nawata, Stephan Stieberger, Tomasz T. Taylor
Tomasz Taylor
We consider extensions of the standard model based on open strings ending on D-branes, with gauge bosons due to strings attached to stacks of D-branes and chiral matter due to strings stretching between intersecting D-branes. Assuming that the fundamental string mass scale is in the TeV range and the theory is weakly coupled, we discuss possible signals of string physics at the Large Hadron Collider (LHC). In such D-brane constructions, the dominant contributions to full-fledged string amplitudes for all the common QCD parton subprocesses leading to dijets are completely independent of the details of compactification, and can be evaluated in …
Duality Symmetries In N = 2 Heterotic Superstring, I. Antoniadis, S. Ferrara, E. Gava, K. Narain, T. Taylor
Duality Symmetries In N = 2 Heterotic Superstring, I. Antoniadis, S. Ferrara, E. Gava, K. Narain, T. Taylor
Tomasz Taylor
We review the derivation and the basic properties of the perturbative prepotential in N=2 compactifications of the heterotic superstring. We discuss the structure of the perturbative monodromy group and the embedding of rigidly supersymmetric monodromies associated with enhanced gauge groups, at both perturbative and non-perturbative level.
Direct Production Of Lightest Regge Resonances, W. Z. Feng, D. Lüst, S. Stieberger, T. R. Taylor
Direct Production Of Lightest Regge Resonances, W. Z. Feng, D. Lüst, S. Stieberger, T. R. Taylor
Tomasz Taylor
We discuss direct production of Regge excitations in the collisions of massless four-dimensional superstring states, focusing on the first excited level of open strings ending on D-branes extending into higher dimensions. We construct covariant vertex operators and identify ``universal'' Regge states with the internal parts either trivial or determined by the world-sheet SCFT describing superstrings propagating on an arbitrary Calabi-Yau manifold. We evaluate the amplitudes involving one such massive state and up to three massless ones and express them in the helicity basis. The most important phenomenological applications of our results are in the context of low-mass string (and large …
Dual N = 2 Susy Breaking, I. Antoniadis, T. Taylor
Dual N = 2 Susy Breaking, I. Antoniadis, T. Taylor
Tomasz Taylor
We discuss spontaneous supersymmetry breaking in $N=2$ globally supersymmetric theories describing abelian vector multiplets. The most general form of the action admits, in addition to the usual Fayet-Iliopoulos term, a magnetic Fayet-Iliopoulos term for the auxiliary components of dual vector multiplets. In a generic case, this leads to a spontaneous breakdown of one of the two supersymmetries. In some cases however, dyon condensation restores $N=2$ SUSY vacuum. This talk is based on the work done in collaboration with H. Partouche \cite{apt}.
Effective Μ-Term In Superstring Theory, I. Antoniadis, E. Gava, K. Narain, T. Taylor
Effective Μ-Term In Superstring Theory, I. Antoniadis, E. Gava, K. Narain, T. Taylor
Tomasz Taylor
In four-dimensional compactifications of the heterotic superstring theory the K\"ahler potential has a form which generically induces a superpotential mass term for Higgs particles once supersymmetry is broken at low energies. This ``$\mu$-term'' is analyzed in a model-independent way at the tree level and in the one-loop approximation, and explicit expressions are obtained for orbifold compactifications. Additional contributions which arise in the case of supersymmetry breaking induced by gaugino condensation are also discussed.
Aspects Of Type I– Type Ii– Heterotic Triality In Four Dimensions, I. Antoniadis, C. Bachas, C. Fabre, H. Partouche, T. R. Taylor
Aspects Of Type I– Type Ii– Heterotic Triality In Four Dimensions, I. Antoniadis, C. Bachas, C. Fabre, H. Partouche, T. R. Taylor
Tomasz Taylor
We discuss the equivalence between Type I, Type II and Heterotic N = 2 superstring theories in four dimensions. We study the effective field theory of Type I models obtained by orientifold reductions of Type IIB compactifications on K₃ × T². We show that the perturbative prepotential is determined by the one-loop corrections to the Planck mass and is associated to an index. As is the case for threshold corrections to gauge couplings, this renormalization is entirely due to N = 2 BPS states that originate from D = 6 massless string modes. We apply our result to the so-called …
Complete Six-Gluon Disk Amplitude In Superstring Theory, Stephan Stieberger, Tomasz R. Taylor
Complete Six-Gluon Disk Amplitude In Superstring Theory, Stephan Stieberger, Tomasz R. Taylor
Tomasz Taylor
We evaluate all next-to-maximal helicity violating (NMHV) six-gluon amplitudes in type I open superstring theory in four dimensions, at the disk level, to all orders in α′. Although the computation utilizes supersymmetric Ward identities, the result holds for all compactifications, even for those that break supersymmetry and is completely model-independent. Together with the maximally helicity violating (MHV) amplitudes presented in the previous work, our results provide the complete six-gluon disk amplitude.
Amplitude For N-Gluon Superstring Scattering, Stephan Stieberger, Tomasz R. Taylor
Amplitude For N-Gluon Superstring Scattering, Stephan Stieberger, Tomasz R. Taylor
Tomasz Taylor
We consider scattering processes involving N gluonic massless states of open superstrings with certain Regge slope α′. At the semi-classical level, the string world-sheet sweeps a disk and N gluons are created or annihilated at the boundary. We present exact expressions for the corresponding amplitudes, valid to all orders in α′, for the so-called maximally helicity violating configurations, with N=4, 5 and N=6. We also obtain the leading O(α′²) string corrections to the zero-slope N-gluon Yang-Mills amplitudes.
Branes And Fluxes In D=5 Calabi–Yau Compactifications Of M-Theory, Michał Spaliński, Tomasz R. Taylor
Branes And Fluxes In D=5 Calabi–Yau Compactifications Of M-Theory, Michał Spaliński, Tomasz R. Taylor
Tomasz Taylor
We discuss Poincaré three-brane solutions in D = 5 M-Theory compactifications on Calabi-Yau (CY) threefolds with G-fluxes. We show that the vector moduli freeze at an attractor point. In the case with background flux only, the spacetime geometry contains a zero volume singularity with the three-brane and the CY space shrinking simultaneously to a point. This problem can be avoided by including explicit three-brane sources. We consider two cases in detail: a single brane and, when the transverse dimension is compactified on a circle, a pair of branes with opposite tensions.
Axion Couplings And Effective Cut-Offs In Superstring Compactifications, Mary K. Gaillard, T. R. Taylor
Axion Couplings And Effective Cut-Offs In Superstring Compactifications, Mary K. Gaillard, T. R. Taylor
Tomasz Taylor
We use the linear supermultiplet formalism of supergravity to study axion couplings and chiral anomalies in the context of field-theoretical Lagrangians describing orbifold compactifications beyond the classical approximation. By matching amplitudes computed in the effective low energy theory with the results of string loop calculations we determine the appropriate counterterm in this effective theory that assures modular invariance to all loop order. We use supersymmetry consistency constraints to identify the correct ultra-violet cutoffs for the effective low energy theory. Our results have a simple interpretation in terms of two-loop unification of gauge coupling constants at the string scale.
Decay Widths Of Lowest Massive Regge Excitations Of Open Strings, Luis A. Anchordoqui, Haim Goldberg, Tomasz R. Taylor
Decay Widths Of Lowest Massive Regge Excitations Of Open Strings, Luis A. Anchordoqui, Haim Goldberg, Tomasz R. Taylor
Tomasz Taylor
With the advent of the LHC there is widespread interest in the discovery potential for physics beyond the standard model. In TeV-scale open string theory, the new physics can be manifest in the excitation and decay of new resonant structures, corresponding to Regge recurrences of standard model particles. An essential input for the prediction of invariant mass spectra of the decay products (which could serve to identify the resonance as a string excitation) are the partial and total widths of the decay products. We present a parameter-free calculation of these widths for the first Regge recurrence of the SU(3) gluon …
Calculable E−1/Λ Effects, I. Antoniadis, B. Pioline, T. R. Taylor
Calculable E−1/Λ Effects, I. Antoniadis, B. Pioline, T. R. Taylor
Tomasz Taylor
We identify and evaluate a class of physical amplitudes in four-dimensional N = 4 superstring theory, which receive, in the weak coupling limit, contributions of order e−1/λ, where λ is the type II superstring coupling constant. They correspond to four-derivative Ƒ˜1 interaction terms involving the universal type II dilaton supermultiplet. The exact result, obtained by means of a one-loop computation in the dual heterotic theory compactified on T⁶, is compared with the perturbation theory on the type II side, and the e−1/λ contributions are associated to non-perturbative effects of Euclidean solitons (D-branes) wrapped on K3 × T2. The ten-dimensional decompactification …