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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
Haim Goldberg
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 …
Black Holes From Cosmic Rays: Probes Of Extra Dimensions And New Limits On Tev-Scale Gravity, Luis Anchordoqui, Jonathan Feng, Haim Goldberg, Alfred Shapere
Black Holes From Cosmic Rays: Probes Of Extra Dimensions And New Limits On Tev-Scale Gravity, Luis Anchordoqui, Jonathan Feng, Haim Goldberg, Alfred Shapere
Haim Goldberg
If extra spacetime dimensions and low-scale gravity exist, black holes will be produced in observable collisions of elementary particles. For the next several years, ultra-high energy cosmic rays provide the most promising window on this phenomenon. In particular, cosmic neutrinos can produce black holes deep in the Earth’s atmosphere, leading to quasi-horizontal giant air showers. We determine the sensitivity of cosmic ray detectors to black hole production and compare the results to other probes of extra dimensions. With n ≥ 4 extra dimensions, current bounds on deeply penetrating showers from AGASA already provide the most stringent bound on low-scale gravity, …