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1. Snowmass 2013 Top quark working group report

Author

Agashe, K., Erbacher, R., Gerber, C. E., Melnikov, K., Schwienhorst, R., Mitov, A., Vos, M., Wimpenny, S., Adelman, J., Baumgart, M., Garcia-Bellido, A., Loginov, A., Jung, A., Schulze, M., Shelton, J., Craig, N., Velasco, M., Golling, T., Hubisz, J., Ivanov, A., Perelstein, M., Chekanov, S., Dolen, J., Pilot, J., Pöschl, R., Tweedie, B., Alioli, S., Alvarez-Gonzalez, B., Amidei, D., Andeen, T., Arce, A., Auerbach, B., Avetisyan, A., Backovic, M., Bai, Y., Begel, M., Berge, S., Bernard, C., Bernius, C., Bhattacharya, S., Black, K., Blondel, A., Bloom, K., Bose, T., Boudreau, J., Brau, J., Broggio, A., Brooijmans, G., Brost, E., Calkins, R., Chakraborty, D., Childress, T., Choudalakis, G., Coco, V., Conway, J. S., Degrande, C., Delannoy, A., Deliot, F., Dell'Asta, L., Drueke, E., Dutta, B., Effron, A., Ellis, K., Erdmann, J., Evans, J., Feng, C., Feng, E., Ferroglia, A., Finelli, K., Flanagan, W., Fleck, I., Freitas, A., Garberson, F., Suarez, R. Gonzalez, Graesser, M. L., Graf, N., Greenwood, Z., George, J., Group, C., Gurrola, A., Hammad, G., Han, T., Han, Z., Heintz, U., Hoeche, S., Horiguchi, T., Iashvili, I., Ismail, A., Jain, S., Janot, P., Johns, W., Joshi, J., Juste, A., Kamon, T., Kao, C., Kats, Y., Katz, A., Kaur, M., Kehoe, R., Keung, W., Khalil, S., Khanov, A., Kharchilava, A., Kidonakis, N., Kilic, C., Kolev, N., Kotwal, A., Kraus, J., Krohn, D., Kruse, M., Kumar, A., Lee, S., Luiggi, E., Mantry, S., Melo, A., Miller, D., Moortgat-Pick, G., Narain, M., Odell, N., Oksuzian, Y., Oreglia, M., Penin, A., Peters, Y., Pollard, C., Poss, S., Rappoccio, H. B. Prosper S., Redford, S., Reece, M., Rizatdinova, F., Roloff, P., Ruiz, R., Saleem, M., Schoenrock, B., Schwanenberger, C., Schwarz, T., Seidel, K., Shabalina, E., Sheldon, P., Simon, F., Sinha, K., Skands, P., Skubik, P., Sterman, G., Stolarski, D., Strube, J., Stupak, J., Su, S., Tesar, M., Thomas, S., Thompson, E., Tipton, P., Varnes, E., Vignaroli, N., Virzi, J., Vogel, M., Walker, D., Wang, K., Webber, B., Wells, J. D., Westhoff, S., Whiteson, D., Williams, M., Wu, S., Yang, U., Yokoya, H., Yoo, H., Zhang, H., Zhou, N., Zhu, H., and Zupan, J.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

This report summarizes the work of the Energy Frontier Top Quark working group of the 2013 Community Summer Study (Snowmass).

Published
2013

2. A Naturally Light Dilaton and a Small Cosmological Constant

Author

Bellazzini, B., Csaki, C., Hubisz, J., Serra, J., and Terning, J.

Subjects
High Energy Physics - Theory, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology
Abstract

We present a non-supersymmetric theory with a naturally light dilaton. It is based on a 5D holographic description of a conformal theory perturbed by a close-to-marginal operator of dimension 4-epsilon, which develops a condensate. As long as the dimension of the perturbing operator remains very close to marginal (even for large couplings) a stable minimum at hierarchically small scales is achieved, where the dilaton mass squared is suppressed by epsilon. At the same time the cosmological constant in this sector is also suppressed by epsilon, and thus parametrically smaller than in a broken SUSY theory. As a byproduct we also present an exact solution to the scalar-gravity system that can be interpreted as a new holographic realization of spontaneously broken conformal symmetry. Even though this metric deviates substantially from AdS space in the deep IR it still describes a non-linearly realized exactly conformal theory. We also display the effective potential for the dilaton for arbitrary holographic backgrounds., Comment: 30 pages, 3 figures

Published
2013
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3. Tevatron-for-LHC Report: Preparations for Discoveries

Author

Buescher, V., Carena, M., Dobrescu, B., Mrenna, S., Rainwater, D., Schmitt, M., Abdullin, ; S., Acosta, D., Asai, S., Atramentov, O., Baer, H., Balazs, C., Bartalini, P., Belyaev, A., Bernhard, R., Birkedal, A., Cavanaugh, R., Chen, M. -C., Clement, C., Datta, A., de Boer, Y., DeRoeck, A., Drozdetskiy, A., Gershtein, Y., Glenzinski, D., Group, C., Heinemeyer, S., Heldmann, M., Hubisz, J., Karlsson, M., Kong, K., Korytov, A., Kraml, S., Krupovnickas, T., Lafaye, R., Lane, K., Ledroit, F., Lehner, F., Lin, C. -J., Macesanu, C., Matchev, K., Menon, A., Milstead, D., Mitselmakher, G., Morel, J., Morrissey, D., O'Farrill, J., Pakhotin, Y., Perelstein, M., Plehn, T., Raklev, A., Scurlock, B., Sherstnev, A., Skands, P., Sullivan, Z., Tait, T., Tata, X., Torchiani, I., Trocme, B., Wagner, C., Weiglein, G., and Zerwas, D.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

This is the "TeV4LHC" report of the "Physics Landscapes" Working Group, focused on facilitating the start-up of physics explorations at the LHC by using the experience gained at the Tevatron. We present experimental and theoretical results that can be employed to probe various scenarios for physics beyond the Standard Model., Comment: 222 pp., additional contribution added, typos/layout corrected

Published
2006

4. CP Studies and Non-Standard Higgs Physics

Author

Kraml, S., Accomando, E., Akeroyd, A. G., Akhmetzyanova, E., Albert, J., Alves, A., Amapane, N., Aoki, M., Azuelos, G., Baffioni, S., Ballestrero, A., Barger, V., Bartl, A., Bechtle, P., Belanger, G., Belhouari, A., Bellan, R., Belyaev, A., Benes, P., Benslama, K., Bernreuther, W., Besancon, M., Bevilacqua, G., Beyer, M., Bluj, M., Bolognesi, S., Boonekamp, M., Borzumati, F., Boudjema, F., Brandenburg, A., Brauner, T., Buszello, C. P., Butterworth, J. M., Carena, M., Cavalli, D., Cerminara, G., Choi, S. Y., Clerbaux, B., Collard, C., Conley, J. A., Deandrea, A., De Curtis, S., Dermisek, R., De Roeck, A., Dewhirst, G., Diaz, M. A., Diaz-Cruz, J. L., Dietrich, D. D., Dolgopolov, M., Dominici, D., Dubinin, M., Eboli, O., Ellis, J., Evans, N., Fano, L., Ferland, J., Ferrag, S., Fitzgerald, S. P., Fraas, H., Franke, F., Gennai, S., Ginzburg, I. F., Godbole, R. M., Gregoire, T., Grenier, G., Grojean, C., Gudnason, S. B., Gunion, J. F., Haber, H. E., Hahn, T., Han, T., Hankele, V., Hays, C., Heinemeyer, S., Hesselbach, S., Hewett, J. L., Hidaka, K., Hirsch, M., Hollik, W., Hooper, D., Hosek, J., Hubisz, J., Hugonie, C., Kalinowski, J., Kanemura, S., Kashkan, V., Kernreiter, T., Khater, W., Khoze, V. A., Kilian, W., King, S. F., Kittel, O., Klamke, G., Kneur, J. L., Kouvaris, C., Krawczyk, M., Krstonosic, P., Kyriakis, A., Langacker, P., Le, M. P., Lee, H. -S., Lee, J. S., Lemaire, M. C., Liao, Y., Lillie, B., Litvin, V., Logan, H. E., McElrath, B., Mahmoud, T., Maina, E., Mariotti, C., Marquard, P., Martin, A. D., Mazumdar, K., Miller, D. J., Mine, P., Moenig, K., Moortgat-Pick, G., Moretti, S., Muhlleitner, M. M., Munir, S., Nevzorov, R., Newman, H., Niezurawski, P., Nikitenko, A., Noriega-Papaqui, R., Okada, Y., Osland, P., Pilaftsis, A., Porod, W., Przysiezniak, H., Pukhov, A., Rainwater, D., Raspereza, A., Reuter, J., Riemann, S., Rindani, S., Rizzo, T. G., Ros, E., Rosado, A., Rousseau, D., Roy, D. P., Ryskin, M. G., Rzehak, H., Sannino, F., Schmidt, E., Schroder, H., Schumacher, M., Semenov, A., Senaha, E., Shaughnessy, G., Singh, R. K., Terning, J., Vacavant, L., Velasco, M., del Moral, A. Villanova, von der Pahlen, F., Weiglein, G., Williams, J., Williams, K., Zarnecki, A. F., Zeppenfeld, D., Zerwas, D., Zerwas, P. M., Zerwekh, A. R., and Ziethe, J.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

There are many possibilities for new physics beyond the Standard Model that feature non-standard Higgs sectors. These may introduce new sources of CP violation, and there may be mixing between multiple Higgs bosons or other new scalar bosons. Alternatively, the Higgs may be a composite state, or there may even be no Higgs at all. These non-standard Higgs scenarios have important implications for collider physics as well as for cosmology, and understanding their phenomenology is essential for a full comprehension of electroweak symmetry breaking. This report discusses the most relevant theories which go beyond the Standard Model and its minimal, CP-conserving supersymmetric extension: two-Higgs-doublet models and minimal supersymmetric models with CP violation, supersymmetric models with an extra singlet, models with extra gauge groups or Higgs triplets, Little Higgs models, models in extra dimensions, and models with technicolour or other new strong dynamics. For each of these scenarios, this report presents an introduction to the phenomenology, followed by contributions on more detailed theoretical aspects and studies of possible experimental signatures at the LHC and other colliders., Comment: Report of the CPNSH workshop, May 2004 - Dec 2005, 542 pages. The complete report as well as its individual chapters are also available from http://kraml.home.cern.ch/kraml/cpnsh/report.html

Published
2006
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5. Fermions on an Interval: Quark and Lepton Masses without a Higgs

Author

Csaki, C., Grojean, C., Hubisz, J., Shirman, Y., and Terning, J.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We consider fermions on an extra dimensional interval. We find the boundary conditions at the ends of the interval that are consistent with the variational principle, and explain which ones arise in various physical circumstances. We apply these results to higgsless models of electroweak symmetry breaking, where electroweak symmetry is not broken by a scalar vacuum expectation value, but rather by the boundary conditions of the gauge fields. We show that it is possible to find a set of boundary conditions for bulk fermions that would give a realistic fermion mass spectrum without the presence of a Higgs scalar, and present some sample fermion mass spectra for the standard model quarks and leptons as well as their resonances., Comment: LaTeX, 36 pages, 5 figures

Published
2003
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6. Variations of Little Higgs Models and their Electroweak Constraints

Author

Csaki, C., Hubisz, J., Kribs, G. D., Meade, P., and Terning, J.

Subjects
High Energy Physics - Phenomenology
Abstract

We calculate the tree-level electroweak precision constraints on a wide class of little Higgs models including: variations of the Littlest Higgs SU(5)/SO(5), SU(6)/Sp(6), and SU(4)^4/SU(3)^4. By performing a global fit to the precision data we find that for generic regions of the parameter space the bound on the symmetry breaking scale f is several TeV, where we have kept the normalization of f constant in the different models. For example, the ``minimal'' implementation of SU(6)/Sp(6) is bounded by f>3.0 TeV throughout most of the parameter space, and SU(4)^4/SU(3)^4 is bounded by f^2 = f_1^2+f_2^2 > (4.2 TeV)^2. In certain models, such as SU(4)^4/SU(3)^4, a large f does not directly imply a large amount of fine tuning since the heavy fermion masses that contribute to the Higgs mass can be lowered below f for a carefully chosen set of parameters. We also find that for certain models (or variations) there exist regions of parameter space in which the bound on f can be lowered into the range 1-2 TeV. These regions are typically characterized by a small mixing between heavy and standard model gauge bosons, and a small (or vanishing) coupling between heavy U(1) gauge bosons and the light fermions. Whether such a region of parameter space is natural or not is ultimately contingent on the UV completion., Comment: 32 pages, 13 figures; revised discussion of SU(4)^4/SU(3)^4 model, bound on f is slightly higher

Published
2003
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7. Big Corrections from a Little Higgs

Author

Csaki, C., Hubisz, J., Kribs, G. D., Meade, P., and Terning, J.

Subjects
High Energy Physics - Phenomenology
Abstract

We calculate the tree-level expressions for the electroweak precision observables in the SU(5)/SO(5) littlest Higgs model. The source for these corrections are the exchange of heavy gauge bosons, explicit corrections due to non-linear sigma-model dynamics and a triplet Higgs VEV. Weak isospin violating contributions are present because there is no custodial SU(2) global symmetry. The bulk of these weak isospin violating corrections arise from heavy gauge boson exchange while a smaller contribution comes from the triplet Higgs VEV. A global fit is performed to the experimental data and we find that throughout the parameter space the symmetry breaking scale is bounded by f > 4 TeV at 95% C.L. Stronger bounds on f are found for generic choices of the high energy gauge couplings. We find that even in the best case scenario one would need fine tuning of less than a percent to get a Higgs mass as light as 200 GeV., Comment: 20 pages, 5 figures included, typos fixed, comments on the effects of extra vector-like heavy fermions added

Published
2002
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8. Simplified models for LHC new physics searches

Author

Alves, D, Arkani-Hamed, N, Arora, S, Bai, Y, Baumgart, M, Berger, J, Buckley, M, Butler, B, Chang, S, Cheng, HC, Cheung, C, Chivukula, RS, Cho, WS, Cotta, R, Dalfonso, M, Hedri, SE, Essig, R, Evans, JA, Fitzpatrick, L, Fox, P, Franceschini, R, Freitas, A, Gainer, JS, Gershtein, Y, Gray, R, Gregoire, T, Gripaios, B, Gunion, J, Han, T, Haas, A, Hansson, P, Hewett, J, Hits, D, Hubisz, J, Izaguirre, E, Kaplan, J, Katz, E, Kilic, C, Kim, HD, Kitano, R, Koay, SA, Ko, P, Krohn, D, Kuflik, E, Lewis, I, Lisanti, M, Liu, T, Liu, Z, Lu, R, Luty, M, Meade, P, Morrissey, D, Mrenna, S, Nojiri, M, Okui, T, Padhi, S, Papucci, M, Park, M, Perelstein, M, Peskin, M, Phalen, D, Rehermann, K, Rentala, V, Roy, T, Ruderman, JT, Sanz, V, Schmaltz, M, Schnetzer, S, Schuster, P, Schwaller, P, Schwartz, MD, Schwartzman, A, Shao, J, Shelton, J, Shih, D, Shu, J, Silverstein, D, Simmons, E, Somalwar, S, Spannowsky, M, Spethmann, C, Strassler, M, Su, S, Tait, T, Thomas, B, Thomas, S, Toro, N, Volansky, T, Wacker, J, Waltenberger, W, Yavin, I, Yu, F, Zhao, Y, and Zurek, K

Subjects
hep-ph, hep-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

This document proposes a collection of simplified models relevant to the design of new-physics searches at the Large Hadron Collider (LHC) and the characterization of their results. Both ATLAS and CMS have already presented some results in terms of simplified models, and we encourage them to continue and expand this effort, which supplements both signature-based results and benchmark model interpretations. A simplified model is defined by an effective Lagrangian describing the interactions of a small number of new particles. Simplified models can equally well be described by a small number of masses and cross-sections. These parameters are directly related to collider physics observables, making simplified models a particularly effective framework for evaluating searches and a useful starting point for characterizing positive signals of new physics. This document serves as an official summary of the results from the Topologies for Early LHC Searches workshop, held at SLAC in September of 2010, the purpose of which was to develop a set of representative models that can be used to cover all relevant phase space in experimental searches. Particular emphasis is placed on searches relevant for the first 50-500 pb 1 of data and those motivated by supersymmetric models. This note largely summarizes material posted at http://lhcnewphysics.org/, which includes simplified model definitions, Monte Carlo material, and supporting contacts within the theory community. We also comment on future developments that may be useful as more data is gathered and analyzed by the experiments. © 2012 IOP Publishing Ltd.

Published
2012

9. Tevatron-for-LHC Report: Preparations for Discoveries

Author

Buescher, V, Carena, M, Dobrescu, B, Mrenna, S, Rainwater, D, Schmitt, M, Abdullin, S, Acosta, D, Asai, S, Atramentov, O, Baer, H, Balazs, C, Bartalini, P, Belyaev, A, Bernhard, R, Birkedal, A, Cavanaugh, R, Chen, M-C, Clement, C, Datta, A, Boer, Y de, DeRoeck, A, Drozdetskiy, A, Gershtein, Y, Glenzinski, D, Group, C, Heinemeyer, S, Heldmann, M, Hubisz, J, Karlsson, M, Kong, K, Korytov, A, Kraml, S, Krupovnickas, T, Lafaye, R, Lane, K, Ledroit, F, Lehner, F, Lin, C-J, Macesanu, C, Matchev, K, Menon, A, Milstead, D, Mitselmakher, G, Morel, J, Morrissey, D, O'Farrill, J, Pakhotin, Y, Perelstein, M, Plehn, T, Raklev, A, Scurlock, B, Sherstnev, A, Skands, P, Sullivan, Z, Tait, T, Tata, X, Torchiani, I, Trocme, B, Wagner, C, Weiglein, G, and Zerwas, D

Subjects
hep-ph, hep-ex
Abstract

This is the "TeV4LHC" report of the "Physics Landscapes" Working Group,focused on facilitating the start-up of physics explorations at the LHC byusing the experience gained at the Tevatron. We present experimental andtheoretical results that can be employed to probe various scenarios for physicsbeyond the Standard Model.

Published
2006

10. Workshop on CP Sudies and Non-Standard Physics

Author

Kraml, S., Accomando, E., Akeroyd, A. G., Akhmetzyanova, E., Albert, J., Alves, A., Amapane, N., Aoki, M., Azuelos, G., Baffioni, S., Ballestrero, A., Barger, V., Bartl, A., Bechtle, P., Bélanger, G., Belhouari, A., Bellan, R., Belyaev, A., Benes, P., Benslama, K., Bernreuther, W., Besancon, M., Bevilacqua, G., Beyer, M., Bluj, M., Bolognesi, S., Boonekamp, M., Borzumati, F., Boudjema, F., Brandenburg, A., Brauner, T., Buszello, C. P., Butterworth, J. M., Carena, M., Cavalli, D., Cerminara, G., Choi, S. Y., Clerbaux, B., Collard, C., Conley, J. A., Deandrea, A., De Curtis, S., Dermisek, R., De Roeck, A., Dewhirst, G., Díaz, M. A., Díaz-Cruz, J. L., Dietrich, D. D., Dolgopolov, M., Dominici, D., Dubinin, M., Eboli, O., Ellis, J., Evans, N., Fano, L., Ferland, J., Ferrag, S., Fitzgerald, S. P., Fraas, H., Franke, F., Gennai, S., Ginzburg, I. F., Godbole, R. M., Grégoire, T., Grenier, G., Grojean, C., Gudnason, S. B., Gunion, J. F., Haber, H. E., Hahn, T., Han, T., Hankele, V., Hays, C., Heinemeyer, S., Hesselbach, S., Hewett, J. L., Hidaka, K., Hirsch, M., Hollik, W., Hooper, D., Hosek, J., Hubisz, J., Hugonie, C., Kalinowski, J., Kanemura, S., Kashkan, V., Kernreiter, T., Khater, W., Khoze, V. A., Kilian, W., King, S. F., Kittel, O., Klämke, G., Kneur, J. L., Kouvaris, C., Krawczyk, M., Krstonosic, P., Kyriakis, A., Langacker, P., Le, M. P., Lee, H.-S., Lee, J. S., Lemaire, M. C., Liao, Y., Lillie, B., Litvin, V., Logan, H. E., McElrath, B., Mahmoud, T., Maina, E., Mariotti, C., Marquard, P., Martin, A. D., Mazumdar, K., Miller, D. J., Miné, P., Mönig, K., Moortgat-Pick, G., Moretti, S., Mühlleitner, M. M., Munir, S., Nevzorov, R., Newman, H., Niet\. zurawski, P., Nikitenko, A., Noriega-Papaqui, R., Okada, Y., Osland, P., Pilaftsis, A., Porod, W., Przysiezniak, H., Pukhov, A., Rainwater, D., Raspereza, A., Reuter, J., Riemann, S., Rindani, S., Rizzo, T. G., Ros, E., Rosado, A., Rousseau, D., Roy, D. P., Ryskin, M. G., Rzehak, H., Sannino, F., Schmidt, E., Schröder, H., Schumacher, M., Semenov, A., Senaha, E., Shaughnessy, G., Singh, R. K., Terning, J., Vacavant, L., Velasco, M., Villanova del Moral, A., von der Pahlen, F., Weiglein, G., Williams, J., Williams, K., Zarnecki, A. F., Zeppenfeld, D., Zerwas, D., Zerwas, P. M., Zerwekh, A. R., and Ziethe, J.

Published
2006

11. Workshop on CP Studies and Non-Standard Higgs Physics

Author

Kraml, S., Accomando, E., Akeroyd, A.G., Akhmetzyanova, E., Albert, J., Alves, A., Amapane, N., Aoki, M., Azuelos, G., Baffioni, S., Ballestrero, A., Barger, V., Bartl, A., Bechtle, P., Belanger, G., Belhouari, A., Bellan, R., Belyaev, A., Benes, Petr, Benslama, K., Bernreuther, W., Besancon, M., Bevilacqua, G., Beyer, M., Bluj, M., Bolognesi, S., Boonekamp, M., Borzumati, Francesca, Boudjema, F., Brandenburg, A., Brauner, Tomas, Buszello, C.P., Butterworth, J.M., Carena, Marcela, Cavalli, D., Cerminara, G., Choi, S.Y., Clerbaux, B., Collard, C., Conley, John A., Deandrea, A., De Curtis, S., Dermisek, R., De Roeck, A., Dewhirst, G., Diaz, M.A., Diaz-Cruz, J.L., Dietrich, D.D., Dolgopolov, M., Dominici, D., Dubinin, M., Eboli, O., Ellis, John R., Evans, N., Fano, L., Ferland, J., Ferrag, S., Fitzgerald, S.P., Fraas, H., Franke, F., Gennai, S., Ginzburg, I.F., Godbole, R.M., Gregoire, T., Grenier, Gerald Jean, Grojean, C., Gudnason, S.B., Gunion, J.F., Haber, H.E., Hahn, T., Han, T., Hankele, V., Hays, Christopher Paul, Heinemeyer, S., Hesselbach, S., Hewett, J.L., Hidaka, K., Hirsch, M., Hollik, W., Hooper, D., Hosek, J., Hubisz, J., Hugonie, C., Kalinowski, J., Kanemura, S., Kashkan, V., Kernreiter, T., Khater, W., Khoze, V.A., Kilian, W., King, S.F., Kittel, O., Klamke, G., Kneur, J.L., Kouvaris, C., Krawczyk, M., Krstonosic, P., Kyriakis, A., Langacker, P., Le, M.P., Lee, H.-S., Lee, J.S., Lemaire, M.C., Liao, Y., Lillie, B., Litvine, Vladimir A., Logan, H.E., McElrath, Bob, Mahmoud, T., Maina, E., Mariotti, C., Marquard, P., Martin, A.D., Mazumdar, K., Miller, D.J., Mine, P., Min, P., Monig, Klaus, Moortgat-Pick, G., Moretti, S., Muhlleitner, M.M., Munir, S., Nevzorov, R., Newman, H., Niezurawski, P., Nikitenko, A., Noriega-Papaqui, R., Okada, Y., Osland, P., Pilaftsis, A., Porod, W., Przysiezniak, H., Pukhov, A., Rainwater, D., Raspereza, A., Reuter, J., Riemann, S., Rindani, S., Rizzo, T.G., Ros, E., Rosado, A., Rousseau, D., Roy, D.P., Ryskin, M.G., Rzehak, H., Sannino, F., Schmidt, E., Schroder, H., Schumacher, M., Semenov, A., Senaha, E., Shaughnessy, G., Singh, R.K., Terning, J., Vacavant, L., Velasco, M., Villanova del Moral, Albert, von der Pahlen, F., Weiglein, G., Williams, J., Williams, K.E., Zarnecki, A.F., Zeppenfeld, D., Zerwas, D., Zerwas, P.M., Zerwekh, A.R., and Ziethe, J.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics
Abstract

There are many possibilities for new physics beyond the Standard Model that feature non-standard Higgs sectors. These may introduce new sources of CP violation, and there may be mixing between multiple Higgs bosons or other new scalar bosons. Alternatively, the Higgs may be a composite state, or there may even be no Higgs at all. These non-standard Higgs scenarios have important implications for collider physics as well as for cosmology, and understanding their phenomenology is essential for a full comprehension of electroweak symmetry breaking. This report discusses the most relevant theories which go beyond the Standard Model and its minimal, CP-conserving supersymmetric extension: two-Higgs-doublet models and minimal supersymmetric models with CP violation, supersymmetric models with an extra singlet, models with extra gauge groups or Higgs triplets, Little Higgs models, models in extra dimensions, and models with technicolour or other new strong dynamics. For each of these scenarios, this report presents an introduction to the phenomenology, followed by contributions on more detailed theoretical aspects and studies of possible experimental signatures at the LHC and other colliders. There are many possibilities for new physics beyond the Standard Model that feature non-standard Higgs sectors. These may introduce new sources of CP violation, and there may be mixing between multiple Higgs bosons or other new scalar bosons. Alternatively, the Higgs may be a composite state, or there may even be no Higgs at all. These non-standard Higgs scenarios have important implications for collider physics as well as for cosmology, and understanding their phenomenology is essential for a full comprehension of electroweak symmetry breaking. This report discusses the most relevant theories which go beyond the Standard Model and its minimal, CP-conserving supersymmetric extension: two-Higgs-doublet models and minimal supersymmetric models with CP violation, supersymmetric models with an extra singlet, models with extra gauge groups or Higgs triplets, Little Higgs models, models in extra dimensions, and models with technicolour or other new strong dynamics. For each of these scenarios, this report presents an introduction to the phenomenology, followed by contributions on more detailed theoretical aspects and studies of possible experimental signatures at the LHC and other colliders. There are many possibilities for new physics beyond the Standard Model that feature non-standard Higgs sectors. These may introduce new sources of CP violation, and there may be mixing between multiple Higgs bosons or other new scalar bosons. Alternatively, the Higgs may be a composite state, or there may even be no Higgs at all. These non-standard Higgs scenarios have important implications for collider physics as well as for cosmology, and understanding their phenomenology is essential for a full comprehension of electroweak symmetry breaking. This report discusses the most relevant theories which go beyond the Standard Model and its minimal, CP-conserving supersymmetric extension: two-Higgs-doublet models and minimal supersymmetric models with CP violation, supersymmetric models with an extra singlet, models with extra gauge groups or Higgs triplets, Little Higgs models, models in extra dimensions, and models with technicolour or other new strong dynamics. For each of these scenarios, this report presents an introduction to the phenomenology, followed by contributions on more detailed theoretical aspects and studies of possible experimental signatures at the LHC and other colliders. There are many possibilities for new physics beyond the Standard Model that feature non-standard Higgs sectors. These may introduce new sources of CP violation, and there may be mixing between multiple Higgs bosons or other new scalar bosons. Alternatively, the Higgs may be a composite state, or there may even be no Higgs at all. These non-standard Higgs scenarios have important implications for collider physics as well as for cosmology, and understanding their phenomenology is essential for a full comprehension of electroweak symmetry breaking. This report discusses the most relevant theories which go beyond the Standard Model and its minimal, CP-conserving supersymmetric extension: two-Higgs-doublet models and minimal supersymmetric models with CP violation, supersymmetric models with an extra singlet, models with extra gauge groups or Higgs triplets, Little Higgs models, models in extra dimensions, and models with technicolour or other new strong dynamics. For each of these scenarios, this report presents an introduction to the phenomenology, followed by contributions on more detailed theoretical aspects and studies of possible experimental signatures at the LHC and other colliders.

Published
2006

12. Simplified Models for LHC New Physics Searches

Author

Emanuel Katz, Wolfgang Waltenberger, Michele Papucci, Scott Thomas, P. Hansson, JoAnne L. Hewett, David Shih, Joshua Berger, Philip Schuster, Tuhin S. Roy, Liam Fitzpatrick, Jessie Shelton, Martin Schmaltz, Keith Rehermann, Matthew Baumgart, Daniele S. M. Alves, Michael Spannowsky, Jing Shu, Sonia El Hedri, Ayres Freitas, Matthew D. Schwartz, Andy Haas, S. Schnetzer, Hsin-Chia Cheng, Myeonghun Park, Daniel Silverstein, Eric Kuflik, Pedro Schwaller, Spencer Chang, J.F. Gunion, Jing Shao, Kathryn M. Zurek, Jared Kaplan, Michael Park, Stephen Mrenna, David E. Morrissey, Matthew J. Strassler, Thomas Gregoire, Tim M. P. Tait, Ian M. Lewis, Veronica Sanz, Mihoko M. Nojiri, S. Arora, Itay Yavin, Matthew R. Buckley, Sunil Somalwar, Clifford Cheung, Pyungwon Ko, Ran Lu, Brooks Thomas, Patrick J. Fox, Joshua T. Ruderman, Sue Ann Koay, Ryuichiro Kitano, Tao Liu, Mariarosaria D'Alfonso, Yue Zhao, Jay G. Wacker, Nima Arkani-Hamed, Tomer Volansky, Ben Gripaios, Michael E. Peskin, Bart Butler, R. Cotta, Won Sang Cho, Ariel Schwartzman, Vikram Rentala, Hyung Do Kim, Natalia Toro, Sanjay Padhi, Mariangela Lisanti, Jay Hubisz, Dmitry Hits, Zhen Liu, Eder Izaguirre, Patrick Meade, Can Kilic, Maxim Perelstein, Rouven Essig, Jared A. Evans, Elizabeth H. Simmons, Shufang Su, James S. Gainer, Markus A. Luty, Felix Yu, Christian Spethmann, R. Sekhar Chivukula, Takemichi Okui, Roberto Franceschini, Yang Bai, David Krohn, R. N.C. Gray, Tao Han, Daniel J. Phalen, Yuri Gershtein, Alves, D., Arkani Hamed, Arora, S., Bai, Y., Baumgart, M., Berger, J., Buckley, M., Butler, B., Chang, S., Cheng, H. C., Cheung, C., Chivukula, R. S., Cho, W. S., Cotta, R., Dalfonso, M., Hedri, S. E., Essig, R., Evans, J., . A., Fitzpatrick, L., Fox, P., Franceschini, Roberto, Freitas, A., Gainer, J. S., Gershtein, Y., Gray, H., Gregoire, T., Gripaios, B., Gunion, J., Han, T., Haas, A., Hansson, P., Hewett, J., Hits, D., Hubisz, J., Izaguirre, E., Kaplan, D., Katz, E., Kilic, C., Kim, H. D., Kitano, R., Koay, S. A., Ko, P., Krohn, D., Kuflik, E., Lewis, I., Lisanti, M., Liu, T., Liu, Z., Lu, R., Luty, M., Meade, P., Morrissey, D., Mrenna, S., Nojiri, M., Okui, T., Padhi, S., Papucci, M., Park, M., Perelstein, M., Peskin, M., Phalen, D., Rehermann, K., Rentala, V., Roy, T., Ruderman, J. T., Sanz, V., Schmaltz, M., Schnetzer, S., Schuster, P., Schwaller, P., Schwartz, M. D., Schwartzman, A., Shao, J., Shelton, D., Shih, D., Shu, J., Silverstein, D., Simmons, E., Somalwar, S., Spannowsky, M., Spethmann, C., Strassler, M., Su, S., Tait, T., Thomas, B., Thomas, S., Toro, N., Volansky, T., Wacker, J., Waltenberger, W., Yavin, I., Yu, F., Zhao, Y., and Zurek, K.

Subjects
Nuclear and High Energy Physics, Particle physics, Collider physics, Physics beyond the Standard Model, Monte Carlo method, FOS: Physical sciences, Network topology, Atomic, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Nuclear, 010306 general physics, Particle Physics - Phenomenology, Physics, Information retrieval, Large Hadron Collider, hep-ex, 010308 nuclear & particles physics, Small number, Molecular, hep-ph, Observable, Nuclear & Particles Physics, 3. Good health, High Energy Physics - Phenomenology, Phase space
Abstract

This document proposes a collection of simplified models relevant to the design of new-physics searches at the LHC and the characterization of their results. Both ATLAS and CMS have already presented some results in terms of simplified models, and we encourage them to continue and expand this effort, which supplements both signature-based results and benchmark model interpretations. A simplified model is defined by an effective Lagrangian describing the interactions of a small number of new particles. Simplified models can equally well be described by a small number of masses and cross-sections. These parameters are directly related to collider physics observables, making simplified models a particularly effective framework for evaluating searches and a useful starting point for characterizing positive signals of new physics. This document serves as an official summary of the results from the "Topologies for Early LHC Searches" workshop, held at SLAC in September of 2010, the purpose of which was to develop a set of representative models that can be used to cover all relevant phase space in experimental searches. Particular emphasis is placed on searches relevant for the first ~50-500 pb-1 of data and those motivated by supersymmetric models. This note largely summarizes material posted at http://lhcnewphysics.org/, which includes simplified model definitions, Monte Carlo material, and supporting contacts within the theory community. We also comment on future developments that may be useful as more data is gathered and analyzed by the experiments., 40 pages, 2 figures. This document is the official summary of results from "Topologies for Early LHC Searches" workshop (SLAC, September 2010). Supplementary material can be found at http://lhcnewphysics.org

Published
2011

13. A naturally light dilaton and a small cosmological constant.

Author

Bellazzini B, Csáki C, Hubisz J, Serra J, and Terning J

Abstract

We present a non-supersymmetric theory with a naturally light dilaton. It is based on a 5D holographic description of a conformal theory perturbed by a close-to-marginal operator of dimension [Formula: see text] which develops a condensate. As long as the dimension of the perturbing operator remains very close to marginal (even for large couplings) a stable minimum at hierarchically small scales is achieved, where the dilaton mass squared is suppressed by [Formula: see text]. At the same time the cosmological constant in this sector is also suppressed by [Formula: see text], and thus it is parametrically smaller than in a broken SUSY theory. As a byproduct we also present an exact solution to the scalar-gravity system that can be interpreted as a new holographic realization of spontaneously broken conformal symmetry. Even though this metric deviates substantially from AdS space in the deep IR it still describes a non-linearly realized exactly conformal theory. We also display the effective potential for the dilaton for arbitrary holographic backgrounds.

Published
2014
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