Beyond the standard model although the discovery of the higgs boson by the atlas and cms collaborations in 2012 completed the standard model, many mysteries remain unexplained. The standard model and beyond series in high energy. The fifth lecture in a series of lectures, given by robert mann of the university of waterloo, at the 202014 psi. The standard model in a nutshell provides a comprehensive and uncommonly accessible introduction to one of the most important subjects in modern physics, revealing why, despite initial appearances, the entire framework really is as elegant as physicists say.
The standard model of particle physics 1st round 2. Theory space has high dimensionality maybe spacetime. U1, with gauge bosons wi, i 1,2,3, and b for the su2 and u1 factors, respectively, and the corresponding gauge coupling constants g and g the lefthanded fermion. The standard model cannot explain why a particle has a certain mass physicists have theorized the existence of a new field, called the higgs field, which interacts with other particles to give them mass so far, the higgs has not been seen by experiment grand unified theory we believe that gut will unify the strong, weak and electromagnetic. European network on physics beyond the standard model. Oct 16, 2014 the fifth lecture in a series of lectures, given by robert mann of the university of waterloo, at the 202014 psi. The purpose of these lectures is to give an introduction to gauge theories and the standard 14.
The standard model and beyond books pics download new. Quigg, the electroweak theory, hepph0204104 tasi 2000 lectures c. The emphasis is on those ideas that are likely to survive for a while, not only due to lack of data, but also. Standard model the standard model is not just a list of particles and a classi. Theory space has high dimensionality maybe spacetime does too, and contains an infinite number of possibilities. It provides a solid background for understanding supersymmetry, string theory, extra dimensions, dynamical symmetry breaking, and cosmology. Kane randall lab of physics, university of michigan, ann arbor, mi, usa 481091120 this conference emphasizes in part rare decays and symmetries. Write down all the two body decays of w, z, and heavy higgses.
This lecture covers the path integral derivation of the anomaly. The standard model describes quite accurately physics near the electroweak symmetry breaking scale 246 gev. Isapp 2016 avelino vicente the standard model of particle physics and beyond 10 step 1. European network on physics beyond the standard model sissa. The standard model is a description of the strong su3c, weak su2l and electromagnetic u1em interactions in terms of gauge theories. We present multiple approaches to searching for physics beyond the standard model. Despite being the most successful theory of particle physics to date, the standard model is not perfect.
Although such ideas often have a nite lifetime, there are many that have been around for a decade or more, and are likely to play an important role in particle physics at least for another decade. The standard model and beyond up to 10 tev erich poppitz atlas canada physics workshop 1618 april 2007 university of toronto. But the standard model is only a low energy approximation to a more fundamental theory. Much of this material has also been covered in previous cem academic training courses.
As it is well known the most likely possibility for electroweak breaking is provided by the higgs mechanism by which a complex higgs boson doublet is introduced. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The standard model of particle physics is the theory describing three of the four known fundamental forces the electromagnetic, weak, and strong interactions, and not including the gravitational force in the universe, as well as classifying all known elementary particles. One of the main goals of the theory group is to study the mechanism of electroweak symmetry breaking and its phenomenological implications. This primer should provide the necessary background for the lectures on more advanced topics that were covered in this school, such as wphysics and extensions of the standard model. A gauge theory is one that possesses invariance under a set of local transformations i. Lectures at the european school of high energy physics, par adfurd o, hungary, 5 18 june 20. In each case, change one final state particle into its superpartner.
It is a standalone text and reference that covers all aspects of the field of high energy physics. Angert3 1department of biology, suny geneseo, geneseo, ny 14454. Quigg, gauge theories of the strong, weak, and electromagnetic interactions r. Like quantum electrodynamics qed the standard model is a gauge theory, however, with the nonabelian gauge group su3 c su2 l u1 y instead of the simple abelian u1 em gauge group of qed. These are the top squark signal orange and dominant standard model backgrounds arising from dileptonic top quarks blue and leptonictau top quarks purple. Beyond the standard model physics and implications from. Electromagnetism probably the best understood force macroscopic. Greenwood, cambridge university press, cambridge, 2007, extracted by j. The standard model and beyond presents an advanced introduction to the physics and formalism of the standard model and other nonabelian gauge theories. The standard model and beyond series in high energy physics. Successes and failures of qft two lectures lecture 1. The full bsm theory space of possible sm extensions has not been mapped out.
Goldhaber, experimental foundations of particle physics p. This lecture covers abelian and nonabelian anomalies. From bizarre, unexplained parameters such as the cosmological constant, higgs mass, or neutron electric dipole moment to the lack of explanation for observed phenomena such as dark matter and baryogenesis, there is strong evidence that the standard model must be. The mass of an elementary scalar is a relevant operator not obviously protected by any symmetry any new scale in the uv will induce a correction to the higgs mass proportional to the new scale it is difficult to understand the scale of ewsb unless some new structure appears around the tev scale. An overview of unified theory models that extend the standard model is given. Another problem lies within the mathematical framework of the standard model itself. The standard model summary the physics hypertextbook.
The standard model cannot be valid at energies above the planck scale 10 19 gev, where gravity can no longer be ignored. In fact supersymmetric searches are after the higgs search among the most motivated searches at lhc concerning physics beyond the standard model. The standard model of particle physics is a mathematical model that describes electromagnetism, the strong and weak nuclear forces, and the higgs mechanism. The course teaching assistant is luca rottoli, who will contact you for setting dates and times. Pdf the 20th century brought us enormous advances in understanding the most basic constituents of space, time, and matter. The standard model and beyond cern document server. We cover some current topics in beyond the standard.
Gauge group the charged weak current is of the form the simplest possibility is to consider the su2 group and assume that. Precision low energy weak neutral current measurements krishna kumar university of massachusetts, amherst acknowledgement. T 1 and t 2 combined to give t are associated to the w. Consider a headon collision of a 100 gev electron and a 100 gev antielectron positron. The standard model smis the best theoryof describing the nature of particle physics, which is in excellent agreement with almost of all current experiments 2. This now gives the list of possible 2body decays of the appropriate wino, bino, higgsinolike charginosneutralinos. Bsm beyond the standard model 7 not all bsm phenomena are observable with human technology andor funding. It includes many particles like the very well know electron, the photon, the higgs particle sometimes called the god particle, the quarks and many more. Then, an extension of the minimal supersymmetric standard model mssm is studied with an emphasis on the cosmological implications as well as the. The model which describes the world around us is called the standard model of particle physics. This is a problem about vacuum orbits in an su3 symmetric model, suggested by the penultimate paragraph of peter higgs famous 1966 paper. Standard model, supplemented with neutrino mass dirac or.
Renton, pr ecision electroweak tests of the standard model, hepph0206231. W was the same as in neutrino scattering early 90s. Handing in work and attending the problem classes is compulsory for mmathphys students. Contents 1 the hierarchy problem2 2 supersymmetry 5. The standard model of the electroweak interactions sm 1 is based on the gauge group su2. Introduction to the standard model of particle physics. Beyond the standard model the physics hypertextbook. The physics of the standard model and beyond pdf free download. The third lecture in a series of lectures, given by robert mann of the university of waterloo, at the 202014 psi. The standard model and beyond is an authoritative, comprehensive account of the standard model of particle physics, the quantum field theory that underlies it, and the detailed phenomenology needed to confront it with experiment. Su2 l u1 y is spontaneously broken by the higgs mechanism to u1 em. We introduce aspects of physics beyond the standard model focusing on supersymmetry, extra dimensions, and a composite higgs as solutions to the hierarchy problem.
Mass scales in particle physics naturalness in qft. Beyond the standard model institute for theoretical physics. Introduction as we are all aware, the standard model is continuing to describe very well too well all particle physics experiments. I discuss the general ideas which guide the construction of models of physics beyond the standard model. Lectures given at the 20 european school of high energy physics, par adfu rdo, hungary, 5 18 june 20. For instance, why is the mass of the higgs boson so much lighter. A scenario describing the physics beyond the standard model is developed based on a finite quantum field theory fqft. Oct 15, 2014 the third lecture in a series of lectures, given by robert mann of the university of waterloo, at the 202014 psi. A scenario describing the physics beyond the standard model is developed based on a finite quantum field theory fqft and the group gso3, 1. From the sm to predictions at the lhc cross sections, decay widths feynman rules parton model 5. In these lectures we explore some of options for the physics beyond the sm that enforce naturalness.
Searching for physics beyond the standard model and beyond. One model goes beyond that, and considers the real world as a higherdimensional. We should not touch any subject beyond the standard model. Standard model the standard model is more than a collection of particles it is a description of how some of these particles interact in the world think of it like a soccer game.
Parityviolating electron scattering 6 specific choices of kinematics and target nuclei probes different physics. This may be written in terms of 3 j3 hermitian traceless matrices i, i. What is tantalizing is the certainty that this physics beyond the standard model is very closearound the next bend in the road. Standard model lagrangian including neutrino mass terms from an introduction to the standard model of particle physics, 2nd edition, w. It is one of the main challanges for physics beyond sm to preserve natural explanation of the suppresion of fcnc. The standard model to date the lhc has not revealed any new states beyond the standard model bsm even though the searches are sensitive to new states of mass of o1tev with production cross sections comparable to that of the standard model states. We introduce aspects of physics beyond the standard model focusing on supersymmetry, extra. The standard model of particle physics is amazingly successful, yet it leaves many basic questions unanswered.
The standard model the standard model is wellde ned and currently well con rmed by experiments. The implication of the hierarchy problem is that there should to be new physics at the tev scale that eliminates the large loop contributions from above the tev scale1. The standard model in a nutshell lunds universitet. Physics beyond the standard model bsm refers to the theoretical developments needed to explain the deficiencies of the standard model, such as the strong cp problem, neutrino oscillations, matterantimatter asymmetry, and the nature of dark matter and dark energy.
Pinstitute pylos, greece 25 august 7 september 2002 chris quigg electroweak theory pylos 2002 1. A large share of the published output of theoretical physicists consists of proposals for various forms of beyond the standard model new physics proposals that would modify the standard model in ways subtle enough to be consistent with existing data, yet. Proceedings of the 2nd international summer school in high energy physics, mugla, 2530. A wide variety of possible new physics has been probed as may be seen from figs 1 and 2 1. Solutions will be discussed in three problem classes. The standard model the hierarchy or naturalness problem. This content was uploaded by our users and we assume good faith they have the permission to share this book. Consider a eld transforming in the adjoint representation of su3.
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