T. Plehn - M. Vos ed.

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T. Plehn
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M. Vos ed.
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High Energy Physics - Phenomenology (50)
 
High Energy Physics - Experiment (17)
 
Physics - Data Analysis; Statistics and Probability (2)
 
Cosmology and Nongalactic Astrophysics (1)
 
High Energy Physics - Theory (1)

Publications Authored By T. Plehn

Dark matter is a widely discussed topic in contemporary particle physics. Written strictly in the language of particle physics and quantum field theory, these notes focus on a set of standard calculations needed to understand weakly interacting dark matter candidates. After introducing some general features of these dark matter agents and their main competitors, we introduce the Higgs portal scalar and supersymmetric neutralinos as our default models. Read More

From the LHC runs we know that, with increasing collider energy, weak-boson-fusion Higgs production dominates as an environment for precision measurements. We show how a future hadron collider performs for three challenging benchmark signatures. Because all of these measurements rely on the tagging jet signature, we first give a comprehensive analysis of weak-boson-fusion kinematics and a proposed two-step jet veto at a 100 TeV hadron collider. Read More

Machine learning based on convolutional neural networks can be used to study jet images from the LHC. Top tagging in fat jets offers a well-defined framework to establish our DeepTop approach and compare its performance to QCD-based top taggers. We first optimize a network architecture to identify top quarks in Monte Carlo simulations of the Standard Model production channel. Read More

The minimal supersymmetric setup offers a comprehensive framework to interpret the Fermi LAT Galactic center excess. Taking into account experimental, theoretical, and astrophysical uncertainties we can identify valid parameter regions linked to different annihilation channels. They extend to dark matter masses above 250 GeV. Read More

Information geometry can be used to understand and optimize Higgs measurements at the LHC. The Fisher information encodes the maximum sensitivity of observables to model parameters for a given experiment. Applied to higher-dimensional operators, it defines the new physics reach of any LHC signature. Read More

An effective theory of dark matter offers an attractive framework for global analyses of dark matter. In the light of global fits we test the validity of the link between the non-relativistic dark matter annihilation, or the predicted relic density, and LHC signatures. Specifically, we study how well the effective theory describes the main features of simple models with s-channel and t-channel mediators coupling to the Standard Model at tree level or through one-loop diagrams. Read More

Higher-dimensional multi-gluon interactions affect essentially all effective Lagrangian analyses at the LHC. We show that, contrary to common lore, such operators are best constrained in multi-jet production. Our limit on the corresponding new physics scale in the multi-TeV range exceeds the typical reach of global dimension-6 Higgs and top analyses. Read More

2016Oct
Authors: D. de Florian1, C. Grojean2, F. Maltoni3, C. Mariotti4, A. Nikitenko5, M. Pieri6, P. Savard7, M. Schumacher8, R. Tanaka9, R. Aggleton10, M. Ahmad11, B. Allanach12, C. Anastasiou13, W. Astill14, S. Badger15, M. Badziak16, J. Baglio17, E. Bagnaschi18, A. Ballestrero19, A. Banfi20, D. Barducci21, M. Beckingham22, C. Becot23, G. Bélanger24, J. Bellm25, N. Belyaev26, F. U. Bernlochner27, C. Beskidt28, A. Biekötter29, F. Bishara30, W. Bizon31, N. E. Bomark32, M. Bonvini33, S. Borowka34, V. Bortolotto35, S. Boselli36, F. J. Botella37, R. Boughezal38, G. C. Branco39, J. Brehmer40, L. Brenner41, S. Bressler42, I. Brivio43, A. Broggio44, H. Brun45, G. Buchalla46, C. D. Burgard47, A. Calandri48, L. Caminada49, R. Caminal Armadans50, F. Campanario51, J. Campbell52, F. Caola53, C. M. Carloni Calame54, S. Carrazza55, A. Carvalho56, M. Casolino57, O. Cata58, A. Celis59, F. Cerutti60, N. Chanon61, M. Chen62, X. Chen63, B. Chokoufé Nejad64, N. Christensen65, M. Ciuchini66, R. Contino67, T. Corbett68, R. Costa69, D. Curtin70, M. Dall'Osso71, A. David72, S. Dawson73, J. de Blas74, W. de Boer75, P. de Castro Manzano76, C. Degrande77, R. L. Delgado78, F. Demartin79, A. Denner80, B. Di Micco81, R. Di Nardo82, S. Dittmaier83, A. Dobado84, T. Dorigo85, F. A. Dreyer86, M. Dührssen87, C. Duhr88, F. Dulat89, K. Ecker90, K. Ellis91, U. Ellwanger92, C. Englert93, D. Espriu94, A. Falkowski95, L. Fayard96, R. Feger97, G. Ferrera98, A. Ferroglia99, N. Fidanza100, T. Figy101, M. Flechl102, D. Fontes103, S. Forte104, P. Francavilla105, E. Franco106, R. Frederix107, A. Freitas108, F. F. Freitas109, F. Frensch110, S. Frixione111, B. Fuks112, E. Furlan113, S. Gadatsch114, J. Gao115, Y. Gao116, M. V. Garzelli117, T. Gehrmann118, R. Gerosa119, M. Ghezzi120, D. Ghosh121, S. Gieseke122, D. Gillberg123, G. F. Giudice124, E. W. N. Glover125, F. Goertz126, D. Gonçalves127, J. Gonzalez-Fraile128, M. Gorbahn129, S. Gori130, C. A. Gottardo131, M. Gouzevitch132, P. Govoni133, D. Gray134, M. Grazzini135, N. Greiner136, A. Greljo137, J. Grigo138, A. V. Gritsan139, R. Gröber140, S. Guindon141, H. E. Haber142, C. Han143, T. Han144, R. Harlander145, M. A. Harrendorf146, H. B. Hartanto147, C. Hays148, S. Heinemeyer149, G. Heinrich150, M. Herrero151, F. Herzog152, B. Hespel153, V. Hirschi154, S. Hoeche155, S. Honeywell156, S. J. Huber157, C. Hugonie158, J. Huston159, A. Ilnicka160, G. Isidori161, B. Jäger162, M. Jaquier163, S. P. Jones164, A. Juste165, S. Kallweit166, A. Kaluza167, A. Kardos168, A. Karlberg169, Z. Kassabov170, N. Kauer171, D. I. Kazakov172, M. Kerner173, W. Kilian174, F. Kling175, K. Köneke176, R. Kogler177, R. Konoplich178, S. Kortner179, S. Kraml180, C. Krause181, F. Krauss182, M. Krawczyk183, A. Kulesza184, S. Kuttimalai185, R. Lane186, A. Lazopoulos187, G. Lee188, P. Lenzi189, I. M. Lewis190, Y. Li191, S. Liebler192, J. Lindert193, X. Liu194, Z. Liu195, F. J. Llanes-Estrada196, H. E. Logan197, D. Lopez-Val198, I. Low199, G. Luisoni200, P. Maierhöfer201, E. Maina202, B. Mansoulié203, H. Mantler204, M. Mantoani205, A. C. Marini206, V. I. Martinez Outschoorn207, S. Marzani208, D. Marzocca209, A. Massironi210, K. Mawatari211, J. Mazzitelli212, A. McCarn213, B. Mellado214, K. Melnikov215, S. B. Menari216, L. Merlo217, C. Meyer218, P. Milenovic219, K. Mimasu220, S. Mishima221, B. Mistlberger222, S. -O. Moch223, A. Mohammadi224, P. F. Monni225, G. Montagna226, M. Moreno Llácer227, N. Moretti228, S. Moretti229, L. Motyka230, A. Mück231, M. Mühlleitner232, S. Munir233, P. Musella234, P. Nadolsky235, D. Napoletano236, M. Nebot237, C. Neu238, M. Neubert239, R. Nevzorov240, O. Nicrosini241, J. Nielsen242, K. Nikolopoulos243, J. M. No244, C. O'Brien245, T. Ohl246, C. Oleari247, T. Orimoto248, D. Pagani249, C. E. Pandini250, A. Papaefstathiou251, A. S. Papanastasiou252, G. Passarino253, B. D. Pecjak254, M. Pelliccioni255, G. Perez256, L. Perrozzi257, F. Petriello258, G. Petrucciani259, E. Pianori260, F. Piccinini261, M. Pierini262, A. Pilkington263, S. Plätzer264, T. Plehn265, R. Podskubka266, C. T. Potter267, S. Pozzorini268, K. Prokofiev269, A. Pukhov270, I. Puljak271, M. Queitsch-Maitland272, J. Quevillon273, D. Rathlev274, M. Rauch275, E. Re276, M. N. Rebelo277, D. Rebuzzi278, L. Reina279, C. Reuschle280, J. Reuter281, M. Riembau282, F. Riva283, A. Rizzi284, T. Robens285, R. Röntsch286, J. Rojo287, J. C. Romão288, N. Rompotis289, J. Roskes290, R. Roth291, G. P. Salam292, R. Salerno293, M. O. P. Sampaio294, R. Santos295, V. Sanz296, J. J. Sanz-Cillero297, H. Sargsyan298, U. Sarica299, P. Schichtel300, J. Schlenk301, T. Schmidt302, C. Schmitt303, M. Schönherr304, U. Schubert305, M. Schulze306, S. Sekula307, M. Sekulla308, E. Shabalina309, H. S. Shao310, J. Shelton311, C. H. Shepherd-Themistocleous312, S. Y. Shim313, F. Siegert314, A. Signer315, J. P. Silva316, L. Silvestrini317, M. Sjodahl318, P. Slavich319, M. Slawinska320, L. Soffi321, M. Spannowsky322, C. Speckner323, D. M. Sperka324, M. Spira325, O. Stål326, F. Staub327, T. Stebel328, T. Stefaniak329, M. Steinhauser330, I. W. Stewart331, M. J. Strassler332, J. Streicher333, D. M. Strom334, S. Su335, X. Sun336, F. J. Tackmann337, K. Tackmann338, A. M. Teixeira339, R. Teixeira de Lima340, V. Theeuwes341, R. Thorne342, D. Tommasini343, P. Torrielli344, M. Tosi345, F. Tramontano346, Z. Trócsányi347, M. Trott348, I. Tsinikos349, M. Ubiali350, P. Vanlaer351, W. Verkerke352, A. Vicini353, L. Viliani354, E. Vryonidou355, D. Wackeroth356, C. E. M. Wagner357, J. Wang358, S. Wayand359, G. Weiglein360, C. Weiss361, M. Wiesemann362, C. Williams363, J. Winter364, D. Winterbottom365, R. Wolf366, M. Xiao367, L. L. Yang368, R. Yohay369, S. P. Y. Yuen370, G. Zanderighi371, M. Zaro372, D. Zeppenfeld373, R. Ziegler374, T. Zirke375, J. Zupan376
Affiliations: 1eds., 2eds., 3eds., 4eds., 5eds., 6eds., 7eds., 8eds., 9eds., 10The LHC Higgs Cross Section Working Group, 11The LHC Higgs Cross Section Working Group, 12The LHC Higgs Cross Section Working Group, 13The LHC Higgs Cross Section Working Group, 14The LHC Higgs Cross Section Working Group, 15The LHC Higgs Cross Section Working Group, 16The LHC Higgs Cross Section Working Group, 17The LHC Higgs Cross Section Working Group, 18The LHC Higgs Cross Section Working Group, 19The LHC Higgs Cross Section Working Group, 20The LHC Higgs Cross Section Working Group, 21The LHC Higgs Cross Section Working Group, 22The LHC Higgs Cross Section Working Group, 23The LHC Higgs Cross Section Working Group, 24The LHC Higgs Cross Section Working Group, 25The LHC Higgs Cross Section Working Group, 26The LHC Higgs Cross Section Working Group, 27The LHC Higgs Cross Section Working Group, 28The LHC Higgs Cross Section Working Group, 29The LHC Higgs Cross Section Working Group, 30The LHC Higgs Cross 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This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016. The main goal of the working group was to present the state-of-the-art of Higgs physics at the LHC, integrating all new results that have appeared in the last few years. The first part compiles the most up-to-date predictions of Higgs boson production cross sections and decay branching ratios, parton distribution functions, and off-shell Higgs boson production and interference effects. Read More

Effective Lagrangians are a useful tool for a data-driven approach to physics beyond the Standard Model at the LHC. However, for the new physics scales accessible at the LHC, the effective operator expansion is only relatively slowly converging at best. For tree-level processes, it has been found that the agreement between the effective Lagrangian and a range of UV-complete models depends sensitively on the appropriate definition of the matching. Read More

We study Higgs pair production with a subsequent decay to a pair of photons and a pair of bottoms at the LHC. We use the log-likelihood ratio to identify the kinematic regions which either allow us to separate the di-Higgs signal from backgrounds or to determine the Higgs self-coupling. We find that both regions are separate enough to ensure that details of the background modelling will not affect the determination of the self-coupling. Read More

Motivated by a di-photon anomaly observed by ATLAS and CMS we develop an SFitter analysis for a combined electroweak-Higgs sector, and a scalar portal at the LHC. The theoretical description is based on the linear effective Lagrangian for the Higgs and gauge fields, combined with an additional singlet scalar. The key feature is the extraction of reliable information on the portal structure of the combined scalar potential. Read More

These are the proceedings of the LHCSki 2016 workshop "A First Discussion of 13 TeV Results" that has been held at the Obergurgl Universit\"atszentrum, Tirol, Austria, April 10 - 15, 2016. In this workshop the consequences of the most recent results from the LHC have been discussed, with a focus also on the interplay with dark matter physics, flavor physics, and precision measurements. Contributions from the workshop speakers have been compiled into this document. Read More

2016Jun

This report summarises the physics opportunities in the search and study of physics beyond the Standard Model at a 100 TeV pp collider. Read More

Higgs portal interactions provide a simple mechanism for addressing two open problems in cosmology: dark matter and the baryon asymmetry. In the latter instance, Higgs portal interactions may contain the ingredients for a strong first order electroweak phase transition as well as new CP-violating interactions as needed for electroweak baryogenesis. These interactions may also allow for a viable dark matter candidate. Read More

The effective Lagrangian expansion provides a framework to study effects of new physics at the electroweak scale. To make full use of LHC data in constraining higher-dimensional operators we need to include both the Higgs and the electroweak gauge sector in our study. We first present an analysis of the relevant di-boson production LHC results to update constraints on triple gauge boson couplings. Read More

The next generation of experiments in particle physics will for the first time systematically test flavor physics models based on flavon fields. Starting from the current quark-flavor constrains on such models we show how the new generation of lepton flavor experiments will dominate indirect searches in the coming decades. A future 100 TeV hadron collider will then be the first experiment to probe flavons as propagating degrees of freedom. Read More

Based on a vector triplet model we study a possible failure of dimension-6 operators in describing LHC Higgs kinematics. First, we illustrate that including dimension-6 contributions squared can significantly improve the agreement between the full model and the dimension-6 approximation, both in associated Higgs production and in weak-boson-fusion Higgs production. Second, we test how a simplified model with an additional heavy scalar could improve the agreement in critical LHC observables. Read More

In the recent paper on "The Higgs Legacy of the LHC Run I" we interpreted the LHC Higgs results in terms of an effective Lagrangian using the SFitter framework. For the on-shell Higgs analysis of rates and kinematic distributions we relied on a linear representation based on dimension-6 operators with a simplified fermion sector. In this addendum we describe how the extension of Higgs couplings modifications in a linear dimension-6 Lagrangian can be formally understood in terms of the non-linear effective field theory. Read More

At the LHC, an effective theory of the Higgs sector allows us to analyze kinematic distributions in addition to inclusive rates, although there is no clear hierarchy of scales. We systematically analyze how well dimension-6 operators describe LHC observables in comparison to the full theory, and in a range where the LHC will be sensitive. The key question is how the breakdown of the dimension-6 description affects Higgs measurements during the upcoming LHC run for weakly interacting models. Read More

We present a complete phenomenological prospectus for thermal relic neutralinos. Including Sommerfeld enhancements to relic abundance and halo annihilation calculations, we obtain direct, indirect, and collider discovery prospects for all neutralinos with mass parameters $M_1,M_2,|\mu| < 4$ TeV, that freeze out to the observed dark matter abundance, with scalar superpartners decoupled. Much of the relic neutralino sector will be uncovered by the direct detection experiments Xenon1T and LZ, as well as indirect detection with CTA. Read More

We propose a measurement of the top Yukawa coupling at a 100 TeV hadron collider, based on boosted Higgs and top decays. We find that the top Yukawa coupling can be measured to 1%, with excellent handles for reducing systematic and theoretical uncertainties, both from side bands and from $t\bar{t}H/t\bar{t}Z$ ratios. Read More

The galactic center excess of gamma ray photons can be naturally explained by light Majorana fermions in combination with a pseudoscalar mediator. The NMSSM provides exactly these ingredients. We show that for neutralinos with a significant singlino component the galactic center excess can be linked to invisible decays of the Standard-Model-like Higgs at the LHC. Read More

Supersymmetry (SUSY) is a complete and renormalisable candidate for an extension of the Standard Model. At an energy scale not too far above the electroweak scale it would solve the hierarchy problem of the SM Higgs boson, dynamically explain electroweak symmetry breaking, and provide a dark-matter candidate. Since it doubles the Standard Model degrees of freedom, SUSY predicts a large number of additional particles, whose properties and effects on precision measurements can be explicitly predicted in a given SUSY model. Read More

Based on Run I data we present a comprehensive analysis of Higgs couplings. For the first time this SFitter analysis includes independent tests of the Higgs-gluon and top Yukawa couplings, Higgs decays to invisible particles, and off-shell Higgs measurements. The observed Higgs boson is fully consistent with the Standard Model, both in terms of coupling modifications and effective field theory. Read More

The performance of top taggers, for example in resonance searches, can be significantly enhanced through an increased set of variables, with a special focus on final-state radiation. We study the production and the decay of a heavy gauge boson in the upcoming LHC run. For constant signal efficiency, the multivariate analysis achieves an increased background rejection by up to a factor 30 compared to our previous tagger. Read More

In view of the measured Higgs mass of 125 GeV, the perturbative renormalization group evolution of the Standard Model suggests that our Higgs vacuum might not be stable. We connect the usual perturbative approach and the functional renormalization group which allows for a straightforward inclusion of higher-dimensional operators in the presence of an ultraviolet cutoff. In the latter framework we study vacuum stability in the presence of higher-dimensional operators. Read More

We map the parameter space for MSSM neutralino dark matter which freezes out to the observed relic abundance, in the limit that all superpartners except the neutralinos and charginos are decoupled. In this space of relic neutralinos, we show the dominant dark matter annihilation modes, the mass splittings among the electroweakinos, direct detection rates, and collider cross-sections. The mass difference between the dark matter and the next-to-lightest neutral and charged states is typically much less than electroweak gauge boson masses. Read More

We investigate the potential of multivariate techniques to improve the LHC search for invisible Higgs decays in weak boson fusion. We find that in the coming runs the LHC will be able to probe an invisible Higgs width of 28% within a year and 3.5% during a high luminosity run. Read More

In the upcoming LHC run we will be able to probe the structure ofthe loop--induced Higgs--gluon coupling through kinematics. First, we establish state-of-the-art simulations with up to two jets to next-to-leading order including top mass effects. They allow us to search for deviations from the low-energy limits in boosted Higgs production. Read More

We present state-of-the-art cross section predictions for the production of supersymmetric squarks and gluinos at the upcoming LHC run with a centre-of-mass energy of $\sqrt{s} = 13$ and $14$ TeV, and at potential future $pp$ colliders operating at $\sqrt{s} = 33$ and $100$ TeV. The results are based on calculations which include the resummation of soft-gluon emission at next-to-leading logarithmic accuracy, matched to next-to-leading order supersymmetric QCD corrections. Furthermore, we provide an estimate of the theoretical uncertainty due to the variation of the renormalisation and factorisation scales and the parton distribution functions. Read More

If light--flavor squarks and gluinos are indeed heavy and chargino pair production is plagued with overwhelming backgrounds, pair production and associated production of stops and charginos will become the key signatures in the upcoming LHC runs. We present fully automated next-to-leading order predictions for heavy flavor squark production at the LHC, including stop-chargino associated production, based on MadGolem. We compute the total and differential NLO rates for a variety of MSSM scenarios with a light third generation. Read More

In the Standard Model the Higgs coupling to gluons is almost entirely induced by top quark loops. We derive the logarithmic structure of Higgs production in association with two jets. Just like in the one-jet case the transverse momentum distributions exhibit logarithms of the top quark mass and can be used to test the nature of the loop-induced Higgs coupling to gluons. Read More

The Higgs discovery has given us the Higgs-gauge sector as a new handle to search for physics beyond the Standard Model. This includes physics scenarios originally linked to massive gauge boson scattering at high energies. We investigate how one can separately probe the Higgs couplings to the longitudinal and transverse parts of the massive gauge bosons away from this high-energy limit. Read More

The measured properties of the recently discovered Higgs boson are in good agreement with predictions from the Standard Model. However, small deviations in the Higgs couplings may manifest themselves once the currently large uncertainties will be improved as part of the LHC program and at a future Higgs factory. We review typical new physics scenarios that lead to observable modifications of the Higgs interactions. Read More

The most natural supersymmetric solution to the hierarchy problem prefers the scalar top partner to be close in mass to the top quark. Experimental searches exclude top squarks across a wide range of masses, but a gap remains when the difference between the masses of the stop and the lightest supersymmetric particle is close to the top mass. We propose to search for stops in this regime by exploiting the azimuthal angular correlation of forward tagging jets in (s)top pair production. Read More

We develop a technique to present Higgs coupling measurements, which decouple the poorly defined theoretical uncertainties associated to inclusive and exclusive cross section predictions. The technique simplifies the combination of multiple measurements and can be used in a more general setting. We illustrate the approach with toy LHC Higgs coupling measurements and a collection of new physics models. Read More

Top taggers are established analysis tools to reconstruct boosted hadronically decaying top quarks for example in searches for heavy resonances. We first present a dedicated study of signal efficiency versus background rejection, allowing for an improved choice of working points. Next, we determine to what degree our mass drop selection can be improved by systematically including angular correlations between the decay subjets. Read More

It is well known that understanding the structure of jet radiation can significantly improve Higgs analyses. Using Fox--Wolfram moments we systematically study the geometric patterns of additional jets in weak boson fusion Higgs production with a decay to photons. First, we find a significant improvement with respect to the standard analysis based on an analysis of the tagging jet correlations. Read More

2013Nov
Affiliations: 1M. Vos ed., 2M. Vos ed., 3M. Vos ed., 4M. Vos ed., 5M. Vos ed., 6M. Vos ed., 7M. Vos ed., 8M. Vos ed., 9M. Vos ed., 10M. Vos ed., 11M. Vos ed., 12M. Vos ed., 13M. Vos ed., 14M. Vos ed., 15M. Vos ed., 16M. Vos ed., 17M. Vos ed., 18M. Vos ed., 19M. Vos ed., 20M. Vos ed., 21M. Vos ed., 22M. Vos ed., 23M. Vos ed., 24M. Vos ed., 25M. Vos ed., 26M. Vos ed., 27M. Vos ed., 28M. Vos ed., 29M. Vos ed., 30M. Vos ed., 31M. Vos ed., 32M. Vos ed., 33M. Vos ed., 34M. Vos ed., 35M. Vos ed., 36M. Vos ed., 37M. Vos ed., 38M. Vos ed., 39M. Vos ed., 40M. Vos ed., 41M. Vos ed., 42M. Vos ed., 43M. Vos ed., 44M. Vos ed., 45M. Vos ed., 46M. Vos ed., 47M. Vos ed., 48M. Vos ed., 49M. Vos ed., 50M. Vos ed., 51M. Vos ed., 52M. Vos ed., 53M. Vos ed., 54M. Vos ed., 55M. Vos ed., 56M. Vos ed., 57M. Vos ed., 58M. Vos ed., 59M. Vos ed., 60M. Vos ed., 61M. Vos ed., 62M. Vos ed., 63M. Vos ed., 64M. Vos ed., 65M. Vos ed., 66M. Vos ed., 67M. Vos ed., 68M. Vos ed., 69M. Vos ed., 70M. Vos ed., 71M. Vos ed., 72M. Vos ed., 73M. Vos ed., 74M. Vos ed., 75M. Vos ed., 76M. Vos ed., 77M. Vos ed., 78M. Vos ed., 79M. Vos ed., 80M. Vos ed., 81M. Vos ed., 82M. Vos ed., 83M. Vos ed., 84M. Vos ed., 85M. Vos ed., 86M. Vos ed., 87M. Vos ed.

This report of the BOOST2012 workshop presents the results of four working groups that studied key aspects of jet substructure. We discuss the potential of the description of jet substructure in first-principle QCD calculations and study the accuracy of state-of-the-art Monte Carlo tools. Experimental limitations of the ability to resolve substructure are evaluated, with a focus on the impact of additional proton proton collisions on jet substructure performance in future LHC operating scenarios. Read More

In an era of increasingly advanced experimental analysis techniques it is crucial to understand which phase space regions contribute a signal extraction from backgrounds. Based on the Neyman-Pearson lemma we compute the maximum significance for a signal extraction as an integral over phase space regions. We then study to what degree boosted Higgs strategies benefit ZH and ttH searches and which transverse momenta of the Higgs are most promising. Read More

2013Oct

This report summarizes the work of the Energy Frontier Higgs Boson working group of the 2013 Community Summer Study (Snowmass). We identify the key elements of a precision Higgs physics program and document the physics potential of future experimental facilities as elucidated during the Snowmass study. We study Higgs couplings to gauge boson and fermion pairs, double Higgs production for the Higgs self-coupling, its quantum numbers and $CP$-mixing in Higgs couplings, the Higgs mass and total width, and prospects for direct searches for additional Higgs bosons in extensions of the Standard Model. Read More

We show that associated production of a Higgs with a top pair can be observed in purely hadronic decays. Reconstructing the top quarks in the form of jet buckets allows us to control QCD backgrounds as well as signal combinatorics. The background can be measured from side bands in the reconstructed Higgs mass. Read More

Recent measurements by Planck, LHC experiments, and Xenon100 have significant impact on supersymmetric models and their parameters. We first illustrate the constraints in the mSUGRA plane and then perform a detailed analysis of the general MSSM with 13 free parameters. Using SFitter, Bayesian and Profile Likelihood approaches are applied and their results compared. Read More

Extended Higgs sectors appear in many models for physics beyond the Standard Model. Current Higgs measurements at the LHC are starting to significantly constrain them. We study their Higgs coupling patterns at tree level as well as including quantum corrections. Read More

We present search results based on next-to-leading order predictions for the pair production of color-adjoint leptons at the LHC. Quantum effects are sizable, dominated by pure QCD corrections, and sensitive to threshold effects. We illustrate the stabilization of scale dependences and confirm an excellent agreement between fixed-order and multi-jet predictions for representative distributions. Read More

Reconstructing hadronically decaying top quarks is a key challenge at the LHC, affecting a long list of Higgs analyses and new physics searches. We propose a new method of collecting jets in buckets, corresponding to top quarks and initial state radiation. This method is particularly well suited for moderate transverse momenta of the top quark, closing the gap between top taggers and traditional top reconstruction. Read More

Higgs couplings can be measured at a linear collider with high precision. We estimate the uncertainties of such measurements, including theoretical errors. Based on these results we show an extrapolation for a combined analysis at a linear collider and a high-luminosity LHC. Read More

Geometric correlations between jets as part of hard processes or in addition to hard processes are key ingredients to many LHC analyses. Fox--Wolfram moments systematically describe these correlations in terms of spherical harmonics. These moments, either computed from the tagging jets or from all jets in each event, can significantly improve Higgs searches in weak boson fusion. Read More

Recently, the ATLAS and CMS experiments have reported the discovery of a Higgs like resonance at the LHC. The next analysis step will include the determination of its spin and CP quantum numbers or the form of its interaction Lagrangian channel-by-channel. We show how weak-boson-fusion Higgs production and associated ZH production can be used to separate different spin and CP states. Read More