SUSY 2015, 23rd International Conference on Supersymmetry and Unification of Fundamental Interactions

Session

Alternative Theories

AltT

24 Aug 2015, 14:30

Lake Tahoe

Conveners

Alternative Theories

• Mariangela Lisanti (Stanford University)

Alternative Theories

• Devin Walker

Alternative Theories

• Petar Maksimovic (Johns Hopkins University (US))

Alternative Theories

• Brando Bellazzini (CEA-Saclay)

Alternative Theories

• Benjamin Paul Brau (University of Massachusetts (US))

Alternative Theories

• David Curtin (University of Maryland)

Alternative Theories

• Freya Blekman (IIHE, Vrije Universiteit Brussel (BE))

Alternative Theories

• Hsin-Chia Cheng (University of California, Davis)

280. Recent Theoretical Constraints on Thermal Dark Matter (invited)

Devin Walker

24/08/2015, 14:30

Alternative Theories

We review recent theoretical constraints on models with thermal dark matter. The constraints include perturbative unitarity constraints as well as constraints from dark matter bound state formation. We focus on scenarios where the dark matter annihilates via neutral and charged bosons. The latter includes annihilation via colored and electrically charged scalars, which is common in...

128. Search for Dark Matter recoiling from singly produced high pT objects at CMS

Bhawna Gomber (University of Wisconsin (US))

24/08/2015, 15:00

Alternative Theories

CMS searches for dark matter recoiling from singly produced jets, photons, weak bosons and heavy quarks, using data from 2011-2012 are presented. Prospects for searches in LHC Run-2 are briefly discussed.

242. Dark Matter searches with Mono-X signatures at the ATLAS experiment

Valerio Ippolito (Harvard University (US))

24/08/2015, 15:15

Alternative Theories

Searches for strongly produced dark matters using events with jets, photons, heavy-flavor quarks or massive gauge bosons recoiling against large missing transverse momentum in ATLAS are presented. These “mono-X” signatures provide powerful probes to dark matter production at the LHC, allowing to interpret results in terms of effective field theory and/or simplified models with pair production...

136. Search for dark matter in multijet events at CMS

Phat Srimanobhas (Chulalongkorn University (TH))

24/08/2015, 15:30

Alternative Theories

We present a search for dark matter production using proton-proton collisions recorded by the CMS experiment at the CERN LHC. The data correspond to an integrated luminosity of 18.8 fb^{-1}, at a center-of-mass energy of \sqrt{s} = 8 TeV. Events are requires to have at least two jets and no isolated leptons. The specialized razor variables are employed to quantify the transverse momentum...

130. Searches for Dark Matter in association with top quarks at CMS

Jonatan Piedra Gomez (Universidad de Cantabria (ES))

24/08/2015, 15:45

Alternative Theories

We present results of searches for pair-produced dark matter in association with top quarks, using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 TeV. We investigate processes yielding top quark pairs or a single top quark plus a large amount of missing transverse energy due to the undetected dark matter particle pair. We search for...

256. Hidden Photons and other WISPs - Opportunities at the Low Energy Frontier

Joerg Jaeckel (ITP Heidelberg)

24/08/2015, 16:30

Alternative Theories

We review theoretical and phenomenological motivations for hidden photons (aka dark photons, etc.) and other very light and very weakly coupled new particles. New experiments operating at low energies but offering high sensitivities provide interesting opportunities for discoveries. Additional motivations comes from possible connections to dark matter, which also opens avenues for extremely...

181. Direct searches for low-mass new physics particles at BABAR

Bertrand Echenard (Caltech)

24/08/2015, 17:00

Alternative Theories

We present results from the BaBar experiment on searches for low-mass new physics. This includes a search for a light CP-odd Higgs boson (A0) in Upsilon(1S) -> gamma A0, A0 -> ccbar decays. providing limits on the product branching fraction B(Upsilon(1S) -> gamma A0)xB(A0 -> ccbar) at the level of  7x10-5 - 2x10-3 for A0 masses between 4.0 GeV and 9.25 GeV; a search for a dark photon...

291. Search for the dark photon in $p{i}^0$ decays

Cristina Biino (INFN Torino (IT))

24/08/2015, 17:20

Alternative Theories

A sample of 17 million fully reconstructed ${\pi }^0$ Dalitz decays produced in charged kaon decays in flight collected by the NA48/2 experiment at CERN in 2003-04 is analysed to search for the dark photon ($A$) via the decay chain ${\pi }^0\to \gamma A$, $A\to e^{+}{e}^{-}$. No dark photon signal is observed, and the most stringent limits on the dark photon mixing parameter in the...

47. SHiP: a new fixed target facility for searching for long-lived feebly interacting neutral particles

Walter Marcello Bonivento (INFN Cagliari)

24/08/2015, 17:40

Alternative Theories

SHIP is a new general purpose fixed target facility, whose Technical Proposal has been recently submitted to the CERN SPS Committee. In its initial phase, the 400GeV proton beam extracted from the SPS will be dumped on a heavy target with the aim of integrating $2\times {10}^{20}$ pot in 5 years. A dedicated detector, based on a long vacuum tank followed by a spectrometer and particle...

250. Searches for new physics in diboson resonances with the ATLAS detector at the LHC

Paolo Mastrandrea (Stony Brook and LAPP)

25/08/2015, 14:30

Alternative Theories

Resonant production of two massive bosons (WW, WZ, ZZ and HH) is a smoking gun signature for physics beyond the Standard Model. Searches for diboson resonances have been performed in final states with different numbers of leptons and jets including fat-jets with jet substructure. This talk highlights ATLAS searches for diboson resonances with LHC Run 1 data. First LHC Run-2 results will be...

257. Searches for boosted dibosons in CMS

Jordan Damgov (Texas Tech University (US))

25/08/2015, 15:00

Alternative Theories

Searches for boosted dibosons (WW, WZ, WH, ZH, etc.) may may be sensitive probes of new physics in scenarios where Higgs bosons are composite particles or in certain extra-dimensional models. The recent results of boosted diboson searches with the CMS detector will be presented.

131. Searches for tt and tb resonances at CMS

Emanuele Usai (Hamburg University (DE))

25/08/2015, 15:30

Alternative Theories

We present searches for resonant production of top quark pairs or top- and b quarks, using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 TeV. The search is performed by measuring the invariant mass distribution of the quark pair and testing for deviations from the expected Standard Model background. Final states with zero, one or...

249. Searches for ttbar resonances with the ATLAS detector at the LHC

Lorenzo Feligioni (CPPM Marseille)

25/08/2015, 15:45

Alternative Theories

Many extensions of the Standard Model predict the presence of particles decaying into a pair of top-quarks, ranging from narrow resonances such as leptophobic topcolor Z’ boson to broader resonances like Kaluza-Klein excitation of the gluon in a Randall-Sundrum model of extra dimensions. The search exploits the technique based on large-radius jets and jet substructure to enhance sensitivity...

200. Little Conformal Symmetry

Rachel Houtz (UC Davis)

25/08/2015, 16:30

Alternative Theories

Given the lack of conventional SUSY signals in the LHC data, a more complicated story may be required to explain weak scale physics. We introduce a new scheme for canceling the quadratic divergence of the Higgs mass by addition of a new gauge boson. We can impose this cancellation between the gauge boson contribution and the top contribution to the Higgs mass at one scale while...

61. Improved bounds on heavy neutrino productions at the 8 TeV LHC

Arindam Das (University of Alabama)

25/08/2015, 16:50

Alternative Theories

With the heavy Standard Model (SM) singlet neutrinos, the (inverse) seesaw mechanism provides us with a natural way to incorporate the neutrino mass in the SM. If the heavy neutrinos have their mass of the electroweak scale, they can be produced at the Large Hadron Collider (LHC) through their mixing with the SM light neutrinos. We investigate the heavy neutrino production processes at the LHC...

129. Updated results on heavy neutrino searches in CMS

John Leslie Almond (Seoul National University (KR))

25/08/2015, 17:05

Alternative Theories

Searches for heavy neutrino motivated by the discovery of neutrino oscillations become realistic at the LHC. CMS experiment has updated search results for heavy neutrinos at the LHC using the full 2012 data. We have looked for a signature of dileptons and two jets from heavy neutrino decay. In the talk, we report on the search results on heavy neutrino productions.

95. Gauge-Higgs Grand Unification

Naoki Yamatsu (Osaka University)

25/08/2015, 17:20

Alternative Theories

I will talk about an SO(11) gauge-Higgs grand unified model in the Randall-Sundrum warped space. I will show that orbifold boundary conditions and a brane scalar field correctly break the SO(11) grand unified group into the standard model gauge group; the zero modes of the SO(11) bulk gauge field are corresponding to the SM gauge fields and the SM Higgs field; the zero modes of an SO(11)...

147. Gauge-Higgs Unification with the dynamical boundary conditions and it's SU(5) application

Mr YAMAMOTO Kengo (Department of physics, Osaka University)

25/08/2015, 17:35

Alternative Theories

Gauge-Hiigs Unification is the candidate of Beyond Standard Model. The gauge symmetry of system can be spontaneously broken down by dynamics of Wilson line phase of gauge fields themselves in Gauge-Higgs Unification. This symmetry breaking pattern is highly depend on the boundary condition set which is imposed on fields for extra dimensional directions and in present gauge-Higgs study, these...

137. Searches for new physics in dijet and multijet in CMS

Malgorzata Kazana (NCBJ Warsaw (PL))

27/08/2015, 14:00

Alternative Theories

We present results of searches for new physics in event with inclusive dijet and multijet final states using up to 20 fb-1 of data collected during the 8 TeV LHC run. These include searches for narrow dijet resonances, new physics using diet angular distribution, as well as pair production of new resonances decaying to two or more final state jets. New results with the Run 2 data will be also...

135. Search for RPV SUSY via LQD couplings in dileptons+jets final states at CMS

Sadia Khalil (Kansas State University (US))

27/08/2015, 14:15

Alternative Theories

Unlike the most traditional SUSY searches, there exist many SUSY models that do not produce large missing transverse momentum (MET), such as compressed spectra, long live particles, stealth SUSY, and R-parity violating (RPV) models. Searches for RPV model via the LQD couplings have been performed at Run1, using event signatures of two opposite sign same flavor dileptons (electrons, muons,...

162. Four-Quark Effective Operators at Hadron Colliders

Maikel de Vries (Mainz University)

27/08/2015, 14:30

Alternative Theories

The robustness of translating effective operator constraints to BSM theories crucially depends on the mass and coupling of BSM particles. This is especially relevant for hadron colliders where the partonic centre of mass energy is around the typical energy scales of natural BSM theories. The caveats in applying the limits are discussed using Z' and G' models, illustrating the effects for a...

247. Searches for monopoles and other exotic particles using LHC data at the ATLAS experiment

Gabriel David Palacino Caviedes (York University (CA))

27/08/2015, 14:45

Alternative Theories

Search for highly ionizing particles such as magnetic monopoles or long-lived particles with an electric charge more than the elementary charge has been subject for many experiments over the past decades. Unique signatures for such particles require techniques to be developed on the trigger, identification and reconstruction with tracking detectors and calorimeters. This talk reports searches...

134. Search for excited leptons at CMS

Lovedeep Kaur Saini (Kansas State University (US))

27/08/2015, 15:00

Alternative Theories

CMS searches for a possible compositeness of electrons and muons using data from Run1 at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 /fb, are presented. In these searches, excited leptons are assumed to be produced via contact interactions in conjunction with a standard model lepton and decaying via gauge interactions. The decays considered are l* ->...

252. Searches for leptoquarks and similar signatures with the ATLAS detector at the LHC

Andrey Kamenshchikov (Institute for High Energy Physics (RU))

27/08/2015, 15:15

Alternative Theories

Leptoquarks are hypothetical particles with non-zero lepton and baryon numbers, predicted by many extensions of the Standard Model, and can provide an explanation for the similarity between the quark and lepton sectors. Searches for pair-produced scalar leptoquarks have been performed with final states including charged leptons. In this talk, recent ATLAS results on searches for leptoquarks...

48. Searches for long-lived heavy particles at LHCb

Marcin Chrzaszcz (University of Zurich (CH))

27/08/2015, 16:30

Alternative Theories

Thanks to its forward acceptance and good resolution, the LHCb experiment is competitive in searches for heavy long-lived particles beyond the Standard Model. We report a search for the stau particle with the LHCb detector and give our prospects for searches of Hidden Valley particles.

133. Search for Displaced Supersymmetry in events with leptons with large impact parameters at CMS

Quentin Philippe Python (Vrije Universiteit Brussel (BE))

27/08/2015, 16:50

Alternative Theories

A search for new long-lived particles decaying to leptons is presented using proton-proton collisions produced by the LHC at sqrt(s) = 8 TeV. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of approximately 20 inverse femtobarns. Events are selected with an electron and a muon, with no requirement of a shared vertex, and with di-lepton...

143. Searches for lepton-jets with the ATLAS detector at the LHC

Ms Mahsana Haleem (DESY Zeuthen)

27/08/2015, 17:05

Alternative Theories

Dark sector models, explaining the presence of dark matter in the Universe, predict signatures that can be tested at the LHC. Among those predicted, a smoking gun signature (when the dark sector particles are light) is the presence of a collimated pair of leptons or hadrons, called lepton-jets. Depending on the coupling between the dark sector and the Standard Model sector, the lepton-jets can...

148. Searches for long-lived massive particles in CMS

Malgorzata Kazana (NCBJ Warsaw (PL))

27/08/2015, 17:20

Alternative Theories

Long-lived massive particles are predicted in many supersymmetric and exotic models. The existence of such particles would manifest in the detector by unique signatures such as specific energy loss, late signal in the muon or calorimeter system, displaced vertices or non-pointing photons, appearing or disappearing tracks. The recent results of searches for long-lived signatures with the CMS...

243. Searches for long-lived particles in Hidden Valley scenarios with the ATLAS detector at the LHC

Anna Mastroberardino (Universita della Calabria (IT))

27/08/2015, 17:35

Alternative Theories

Searches for long-lived neutral particles decaying into hadronic jets have been performed with the ATLAS detector. The search strategy depends on the lifetime and mass of such particles, and experimental techniques to reconstruct decay vertices in various ATLAS detector components have been developed. This talk summarizes ATLAS searches for long-lived particles and their connection to hidden...

192. Lattice gauge theory for composite Higgs

David Schaich (Syracuse University)

28/08/2015, 14:00

Alternative Theories

Lattice gauge theory enables non-perturbative investigation of strongly interacting systems from first principles. In recent years this approach has produced increasingly valuable information about strongly coupled gauge theories beyond QCD, in particular systems exhibiting non-perturbative near-conformal dynamics. I will present an overview of recent lattice results relevant to the...

132. Searches for vector-like partners of top and bottom quarks at CMS

Huaqiao Zhang (Chinese Academy of Sciences (CN))

28/08/2015, 14:30

Alternative Theories

We present new results on searches for massive top and bottom quark partners using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 TeV. These fourth-generation vector-like quarks are postulated to solve the Hierarchy problem and stabilize the Higgs mass, while escaping constraints on the Higgs cross section measurement. The...

246. Searches for non-MSSM top/bottom quark partners with the ATLAS detector at the LHC

Jun Guo (Shanghai Jiao Tong University (CN))

28/08/2015, 15:00

Alternative Theories

Title : Searches for non-MSSM top/bottom quark partners with the ATLAS detector at the LHC Abstract : The naturalness is a paradigm for theories beyond the Standard Model (BSM), incorporating mechanism to cancel mass divergence for the Higgs boson. The presence of fermionic top/bottom quark partners, usually referred to as vector-like quarks (VLQs), may be an important ingredient for such...

138. Search for high mass resonances in diphoton final states in CMS

Conor Henderson (University of Alabama (US))

28/08/2015, 15:30

Alternative Theories

This talk will present the most recent results of high mass resonance searches in the diphoton final state. The talk will include results from Randall Sundrum graviton searches (Exotica). Those searches are based on the full 2012 data collected from pp collisions at a center of mass energy of 8 TeV, corresponding to an integrated luminsosity of 19.6 \fb. Such searches are essential to address...

174. Towards a No-Lose Theorem for Naturalness

David Curtin (University of Maryland)

28/08/2015, 16:30

Alternative Theories

Theories of uncolored naturalness can realize untuned solutions to the hierarchy problem while avoiding LHC current exclusion bounds on colored top partners. Their unusual signatures demonstrate the range of phenomena that can connected to stabilizing the electroweak scale, motivating searches for displaced vertices, exotic Higgs decays and emerging jets. I will give an overview of how to...

218. Colorless Top Partners at the LHC

Christopher Verhaaren (University of Maryland, College Park)

28/08/2015, 17:00

Alternative Theories

The impressive sensitivity of the LHC to new colored states has begun to constrain the simplest solutions to the hierarchy problem. Taking naturalness and experiment at face value, we are led to consider models that can address the hierarchy problem without light colored partners to the standard model fermions. I consider three representative models with colorless top partners and detail how...

179. The Holographic Twin Higgs

Mr Ofri Telem (Technion)

28/08/2015, 17:20

Alternative Theories

We present the first realization of a “twin Higgs” model as a holographic composite Higgs model. Uniquely among composite Higgs models, the Higgs potential is protected by a new standard model (SM) singlet elementary “mirror” sector at the sigma model scale f and not by the composite states at mKK, naturally allowing for mKK beyond the LHC reach. As a result, naturalness in our model cannot be...

228. Exotic quarks in Twin Higgs models

Ennio Salvioni (University of California Davis (US))

28/08/2015, 17:40

Alternative Theories

In UV-complete realizations of the Twin Higgs mechanism, exotic fermions charged under both SM and twin gauge symmetries appear. Some of these states carry visible color, and can therefore be produced with sizable rates at hadron colliders. The decays of these exotic quarks give rise to striking signatures, which involve a combination of prompt and displaced objects. We present an analysis of...

319. Low Scale Composite Higgs Model and 1.8 $\sim$ 2 TeV Diboson Excess

Jing Shu (Institute of Theoretical Physics, Chinese Academy of Science)

28/08/2015, 18:00

We consider a simple model to explain the recent diboson excess observed by ATLAS and CMS Collaborations in the ``General Composite Higgs" framework with the coset $SO(5)/SO(4)(SU(2{)}_L\times SU(2{)}_R)$. The $SU(2{)}_L$ triplet vector boson ${\rho }_L$ with mass range of $1.8\sim 2$ TeV, which would be produced through the Drell-Yan process with sizable diboson decay branching ratio, can account...