Supersymmetry and LHC
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EMENTARY PARTICLES AND FIELDS Theory
Supersymmetry and LHC А. V. Gladyshev* and D. I. Kazakov** Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 Russia; Institute of Theoretical and Experimental Physics, Bol’shaya Cheremushkinskaya ul. 25, Moscow, 117259 Russia Received April 13, 2006; in final form, November 1, 2006
Abstract—Motivations for introducing supersymmetry in high-energy physics are discussed along with the possibility of discovering supersymmetry at the Large Hadron Collider (LHC). Various regions of the space of parameters of the minimal supersymmetric standard model are analyzed, and phenomenological manifestations of supersymmetry inherent in these regions are discussed. The discovery potential of LHC at the planned luminosity is indicated for various channels. PACS numbers: 12.60.Jv, 14.80.Ly DOI: 10.1134/S1063778807090104
1. INTRODUCTION Supersymmetry, or symmetry between bosons (particles of integral spin) and fermions (particles of half-integer spin), was proposed in theoretical studies nearly 30 years ago [1]. Since that time, thousands of scientific articles devoted to supersymmetry have been published, all known models of quantum field theory have been subjected to supersymmetrization, and a new mathematical formalism that makes it possible to deal with anticommuting variables has been developed. A unique mathematical nature of supersymmetric theories and the possibility of solving numerous problems of the standard model of fundamental interactions within its supersymmetric extension, along with opening prospects for combining all known interactions within a unified theory, were the reasons for so feverish an activity of the scientific community [2]. Today, supersymmetry is the main candidate for the role of a new unified theory beyond the Standard Model. Searches for various manifestations of supersymmetry in nature have been one of the main tasks for numerous experiments at colliders and nonaccelerator experiments over the past decade. Unfortunately, the result has so far been negative. There are no direct indications of the existence of supersymmetry in particle physics, even though known supersymmetric models are not forbidden by any theoretical or experimental requirements. It is noteworthy that an energy of 1 TeV is thought to be the scale of * **
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supersymmetry breaking, or, as is frequently said, the scale of new physics. This energy value is an order of magnitude higher than the electroweak-symmetrybreaking scale, to which the LEP accelerator is tuned. There is the hope that, at the large hadron collider (LHC), it will be possible to study in detail the fewTeV energy region, to discover the Higgs boson, and to find supersymmetry. Supersymmetry is a challenge to the world physics community—a challenge that was accepted when the construction of LHC was approved. Thus, the hour of decision for high-energy physics when low-energy supersymmetry will be either discovered o
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