The LHC String Hunter's Companion

Abstract

The mass scale of fundamental strings can be as low as few TeV/c^2 provided that spacetime extends into large extra dimensions. We discuss the phenomenological aspects of weakly coupled low mass string theory related to experimental searches for physics beyond the Standard Model at the Large Hadron Collider (LHC). We consider the 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. We focus on the model-independent, universal features of low mass string theory. We compute, collect and tabulate the full-fledged string amplitudes describing all 2->2 parton scattering subprocesses at the leading order of string perturbation theory. We cast our results in a form suitable for the implementation of stringy partonic cross sections in the LHC data analysis. The amplitudes involving four gluons as well as those with two gluons plus two quarks do not depend on the compactification details and are completely model-independent. They exhibit resonant behavior at the parton center of mass energies equal to the masses of Regge resonances. The existence of these resonances is the primary signal of string physics and should be easy to detect. On the other hand, the four-fermion processes like quark-antiquark scattering include also the exchanges of heavy Kaluza-Klein and winding states, whose details depend on the form of internal geometry. They could be used as ``precision tests'' in order to distinguish between various compactification scenarios.

65 pages, 15 figures, harvmac; v2: references added

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Cited by in corpus (80)

• Open & Closed vs. Pure Open String Disk Amplitudes
• The Hunt for New Physics at the Large Hadron Collider
• Dijet signals for low mass strings at the LHC
• Anisotropic Modulus Stabilisation: Strings at LHC Scales with Micron-sized Extra Dimensions
• Evaporation of Microscopic Black Holes in String Theory and the Bound on Species
• LHC Phenomenology for String Hunters
• String moduli inflation: an overview
• Direct Production of Lightest Regge Resonances
• The LHC String Hunter's Companion (II): Five-Particle Amplitudes and Universal Properties
• Stringy origin of Tevatron Wjj anomaly
• Cosmic Rays and the Search for a Lorentz Invariance Violation
• The Importance of Being Rigid: D6-Brane Model Building on T6/Z2xZ6' with Discrete Torsion
• The Weinberg Operator and a Lower String Scale in Orientifold Compactifications
• Rigid D6-branes on T6/[Z(2)xZ(2M)xOmegaR] with discrete torsion
• String Phenomenology at the LHC
• Z'-gauge Bosons as Harbingers of Low Mass Strings
• Stringy explanation of $b\to s{\ell }^{+}{\ell }^{-}$ anomalies
• An elementary introduction to loop quantum gravity
• Higher Spin Scattering in Superstring Theory
• Stringy origin of diboson and dijet excesses at the LHC
• On the possibility of light string resonances at the LHC and Tevatron from Randall-Sundrum throats
• Kaehler metrics and gauge kinetic functions for intersecting D6-branes on toroidal orbifolds - The complete perturbative story
• LHC Phenomenology and Cosmology of String-Inspired Intersecting D-Brane Models
• Top Quarks as a Window to String Resonances
• On stable higher spin states in Heterotic String Theories
• Higher Loop Spin Field Correlators in Various Dimensions
• String Resonances at Hadron Colliders
• Higher Level String Resonances in Four Dimensions
• Differential Equations, Associators, and Recurrences for Amplitudes
• Higher Point Spin Field Correlators in D=4 Superstring Theory
• Seeing through the String Landscape - a String Hunter's Companion in Particle Physics and Cosmology
• Pomerons and BCFW recursion relations for strings on D-branes
• (Unoriented) T-folds with few T's
• Three- and Four-point correlators of excited bosonic twist fields
• Probing Quantum Geometry at LHC
• Massive Supermultiplets in Four-Dimensional Superstring Theory
• Direct generation of a Majorana mass for the Neutron from Exotic Instantons
• Correlators of arbitrary untwisted operators and excited twist operators for N branes at angles
• Simplifying one-loop amplitudes in superstring theory
• Flavour-Condensate-induced Breaking of Supersymmetry in Free Wess-Zumino Fluids
• D6-Brane Model Building on Z(2)xZ(6): MSSM-like and Left-Right Symmetric Models
• TeV-Scale strings
• Light stringy states
• Rigour and Rigidity: Systematics on particle physics D6-brane models on Z(2)xZ(6)
• Searching for string resonances in e^+e^- and γγcollisions
• Tensor Reggeons from Warped Space at the LHC
• Strings in an arbitrary constant magnetic field with arbitrary constant metric and stringy form factors
• Bimetric, Conformal Supergravity and its Superstring Embedding
• Higher Loop Spin Field Correlators in D=4 Superstring Theory
• Two Micron-Size Dark Dimensions
• Pair Production of small Black Holes in Heterotic String Theories
• Distributed SUSY Breaking: Dark Energy, Newton's Law and the LHC
• A closer look at string resonances in dijet events at the LHC
• Revisiting light stringy states in view of the 750 GeV diphoton excess
• Jet Extinction from Non-Perturbative Quantum Gravity Effects
• Canonical quantization of a string describing $N$ branes at angles
• More about Neutron Majorana mass from Exotic Instantons: an alternative mechanism in Low-Scale String theory
• Muon $g-2$ discrepancy within D-brane string compactifications
• String Theory at LHC Using Higgs Production and Decay From String Balls
• Search for jet extinction in the inclusive jet-pt spectrum from proton-proton collisions at sqrt(s) = 8 TeV
• TeV Scale Strings and Scattering Amplitudes at the LHC
• String Theory at LHC Using Top Quarks From String Balls
• Gravitational Forces on a Codimension-2 Brane
• Refined Partition Functions for Open Superstrings with 4, 8 and 16 Supercharges
• Yukawa's of light stringy states
• LHC Phenomenology of Lowest Massive Regge Recurrences in the Randall-Sundrum Orbifold
• BCFW construction of the Veneziano Amplitude
• Towards a fully stringy computation of Yukawa couplings on non factorized tori and non abelian twist correlators (I): the classical solution and action
• Deformations, Moduli Stabilisation and Gauge Couplings at One-Loop
• Detectability of the second resonance of low-scale string models at the LHC
• Production of light stringy states
• FCNC Processes from D-brane Instantons
• From Twists and Shifts to L-R asymmetric D-branes
• Signatures of low-scale string models at the LHC
• Constraints on antisymmetric tensor fields from Bhabha scattering
• Minimal left-right symmetric intersecting D-brane model
• Anomaly Puzzle, Curved-Spacetime Spinor Hamiltonian, and String Phenomenology
• Manifestations of String Theory in Astrophysical Data and at the LHC
• Lifetimes of light stringy states
• One-loop adjoint masses for branes at non-supersymmetric angles