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## 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 ...

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 ...

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 ...

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 ...