Search for pair-produced resonances decaying to jet pairs in proton-proton collisions at √s=8 TeV

Results are reported of a general search for pair production of heavy resonances decaying to pairs of hadronic jets in events with at least four jets. The study is based on up to 19.4 fb(-1) of integrated luminosity from proton-proton collisions at a center-of-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV

Elucidating SUSY in the Interplay of LHC and ILC - τˉ\bar \tauco-annihilation models

While the current 7/8 TeV results form the LHC excludes highly constrainedSUSY models with a light sparticle spectrum, less constrained modelsare still viable. Certain such models promise both discovery ofcoloured sparticles during the upcomming 14 TeV run of the LHC, and a richspectrum of non-coloured states, accessible at the ILC. LHC might ormight not give a hint to the existence of these electro-weak states, butonly at the ILC can measurements with sufficient precision be done toelucidate the details of the model. This contribution discusses howthe combined observations from LHC and ILC can be used to determine MSSMparameters in models with large numbers of free parameters.We illustrate the possible interplay between measurements at ILC and LHC by aconcrete example, compatible with all current constraints. It is a full SUSY modelwhich features a small stau-LSP mass difference, and quite heavy coloured particles.The model has been studied using detailed detector simulation of both LHC and ILCdetectors

Impact of quantum noise on the training of quantum Generative Adversarial Networks

Current noisy intermediate-scale quantum devices suffer from various sources of intrinsic quantum noise. Overcoming the effects of noise is a major challenge, for which different error mitigation and error correction techniques have been proposed. In this paper, we conduct a first study of the performance of quantum Generative Adversarial Networks (qGANs) in the presence of different types of quantum noise, focusing on a simplified use case in high-energy physics. In particular, we explore the effects of readout and two-qubit gate errors on the qGAN training process. Simulating a noisy quantum device classically with IBM's Qiskit framework, we examine the threshold of error rates up to which a reliable training is possible. In addition, we investigate the importance of various hyperparameters for the training process in the presence of different error rates, and we explore the impact of readout error mitigation on the results

Merlin++ 5.02:5.02

Merlin++ is an accelerator simulation program that tracks beams through components of a ring or beamline. Merlin++ is written in C++, and unlike MAD and most other packages, it is actually a library of C++ routines. The user writes their own program and compiles it against the MERLIN class definitions and function libraries. More details can be found at http://www.accelerators.manchester.ac.uk/merlin/ and https://github.com/MERLIN-Collaboration/MERLINChanges in release 5.02 (2019-03-19) Hollow Electron Lens: updates and refactoring. Removed some unneeded modes. Move parameters from process to elements. Add tests. DataTable: Introduction of new data structure and IO for TFS files. A flexible structure for columned data. Can be used to simplify many classes. ParticleBunch: New Constructor, to replace ParticleBunchConstructor class. Creation of common bunch types is now in the ParticleBunch class. Distribution types are factored out into ParticleDistributionGenerator. Aperture: Refactoring, use of DataTable. Aperture hierarchy is simplified. New ApertureConfiguration class using factory pattern and DataTable. MADInterface: Refactoring, use of DataTable. New MADInterface class using factory pattern and DataTable. Random Numbers: Switch to C++11 standard library RNG. Removed old RNG. LatticeFunctions and LinearAlgebra: Better handling of longitudinally unstable lattices. LatticeFunctions can fall back to 4-dims when full 6-dim is unstable. SetForceLongitudinalStability option to replace ScaleBendPathLength. Documentation: Large increase in coverage of doxygen docs. Tutorials: Add tutorials. Code formatting updates. Now using uncustify for formatting, eclipse_formatting_style.xml for Eclipse. Clean-ups, bug fixes, warning fixes, memory leak fixes. See APIChanges.md or the APIChanges page in the documentation for changes that you may need to make to any existing Merlin scripts. Full list of changes can be found using git: git log v5.01..v5.0

Measurement of Jet Production Cross Sections in Deep-inelastic ep Scattering at HERA

A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $5.5<Q^2<80\,{\rm GeV}^2$ and inelasticities $0.2<y<0.6$ is presented, using data taken with the H1 detector at HERA, corresponding to an integrated luminosity of $290\,{\rm pb}^{-1}$. Double-differential inclusive jet, dijet and trijet cross sections are measured simultaneously and are presented as a function of jet transverse momentum observables and as a function of $Q^2$. Jet cross sections normalised to the inclusive neutral current DIS cross section in the respective $Q^2$-interval are also determined. Previous results of inclusive jet cross sections in the range $150<Q^2<15\,000\,{\rm GeV}^2$ are extended to low transverse jet momenta $5<P_{T}^{\rm jet}<7\,{\rm GeV}$. The data are compared to predictions from perturbative QCD in next-to-leading order in the strong coupling, in approximate next-to-next-to-leading order and in full next-to-next-to-leading order. Using also the recently published H1 jet data at high values of $Q^2$, the strong coupling constant $\alpha_s(M_Z)$ is determined in next-to-leading order.A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $5.5<Q^2<80\,{\rm GeV}^2$ and inelasticities $0.2<y<0.6$ is presented, using data taken with the H1 detector at HERA, corresponding to an integrated luminosity of $290\,{\rm pb}^{-1}$. Double-differential inclusive jet, dijet and trijet cross sections are measured simultaneously and are presented as a function of jet transverse momentum observables and as a function of $Q^2$. Jet cross sections normalised to the inclusive neutral current DIS cross section in the respective $Q^2$-interval are also determined. Previous results of inclusive jet cross sections in the range $150<Q^2<15\,000\,{\rm GeV}^2$ are extended to low transverse jet momenta $5<P_{T}^{\rm jet}<7\,{\rm GeV}$. The data are compared to predictions from perturbative QCD in next-to-leading order in the strong coupling, in approximate next-to-next-to-leading order and in full next-to-next-to-leading order. Using also the recently published H1 jet data at high values of $Q^2$, the strong coupling constant $\alpha_s(M_Z)$ is determined in next-to-leading order.A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $5.5<Q^2 <80\,\mathrm {GeV}^2$ and inelasticities $0.2<y<0.6$ is presented, using data taken with the H1 detector at HERA, corresponding to an integrated luminosity of $290\,\mathrm {pb}^{-1}$ . Double-differential inclusive jet, dijet and trijet cross sections are measured simultaneously and are presented as a function of jet transverse momentum observables and as a function of $Q^2$ . Jet cross sections normalised to the inclusive neutral current DIS cross section in the respective $Q^2$ -interval are also determined. Previous results of inclusive jet cross sections in the range $150<Q^2 <15{,}000\,\mathrm {GeV}^2$ are extended to low transverse jet momenta $5<P_\mathrm{T}^\mathrm{jet} <7\,\mathrm {GeV}$ . The data are compared to predictions from perturbative QCD in next-to-leading order in the strong coupling, in approximate next-to-next-to-leading order and in full next-to-next-to-leading order. Using also the recently published H1 jet data at high values of $Q^2$ , the strong coupling constant $\alpha _s(M_Z)$ is determined in next-to-leading order

Colombeau generalized functions on manifolds

Eduard NigschZsfassung in dt. SpracheWien, Techn. Univ. u. Univ., Dipl.-Arb., 2006OeBB(VLID)161012

Search for QCD Instanton-Induced Processes at HERA in the High-Q2\it Q^{2} Domain

Signals of QCD instanton-induced processes are searched for in neutral current deep-inelastic scattering at the electron-proton collider HERA in the kinematic region defined by the Bjorken-scaling variable $x > 10^{-3}$, the inelasticity $0.2< y < 0.7$ and the photon virtuality $150 < Q^2 < 15000$ GeV$^2$. The search is performed using H1 data corresponding to an integrated luminosity of ~$351$ pb$^{-1}$. No evidence for the production of QCD instanton-induced events is observed. Upper limits on the cross section for instanton-induced processes between $1.5$~pb and $6$~pb, at $95\%$~ confidence level, are obtained depending on the kinematic domain in which instantons could be produced. Compared to earlier publications, the limits are improved by an order of magnitude and for the first time are challenging theory predictions