ILC as a SUSY discovery and precision instrument

Data from the LHC at 7, 8, and 13 TeV have so far yielded no evidence for new particles beyond the 125 GeV Higgs boson; in particular, there have been no signs of SUSY. However, the complementary nature of physics with e+e- collisions still offers many interesting scenarios in which SUSY can be discovered at the ILC. These scenarios take advantage of the capability of e+e- collisions to observe events with missing four-momentum - a signature not available at hadron colliders, where only transverse imbalance is observable. Due to low backgrounds and trigger-less operation, detectors at e+e- colliders can observe events with much less visible energy than what is possible at hadron colliders. In this contribution, we will present detailed simulation studies done with the ILD concept at the ILC. These studies include simulation of the full SM background, as well as realistic accelerator conditions. We will show results both on expected discovery and exclusion reaches for the most challenging SUSY channels, such as higgsinos or winos at low mass differences. Evaluations of precision of model-parameter measurements, in case of discovery, will also be given. We also report on how such measurements can be used to put constraints on parts of the sparticle-spectrum beyond direct reach, and to discriminate between different models of SUSY breaking at high scales

Stau searches at the ILC

The direct pair-production of the tau-lepton superpartner, stau, is oneof the most interesting channels to search for SUSY. First of all the stau iswith high probability the lightest of the scalar leptons. Secondly thesignature of stau pair production signal events is one of the most difficultones, yielding to the 'worst' and so most global scenario for the searches.The current model-independent stau limits comes from analysis performed atLEP but they suffer from the low energy of this facility. The LHC exclusionreach extends to higher masses for large mass differences, but under strongmodel assumptions.The ILC, a future electron-positron collider with energy up to 1 TeV, is apromising scenario for SUSY searches. The capability of the ILC for determiningexclusion/discovery limits for the stau in a model-independent way is shown inthis contribution, together with an overview of the current state-of-the-art.A detailed study of the 'worst' scenario for stau exclusion/discovery takinginto account the effect of the stau mixing on stau production cross-sectionand efficiency is presented. For selected benchmarks, the prospect for measuringmasses and polarised cross-sections will be shown. The studies were done usingthe sgv fast simulation adapted to the ILD detector concept at the ILC

Search for new particles at the ILC

Although the LHC experiments have searched for and excluded many proposed new particles up to masses close to 1 TeV, there are many scenarios that are difficult to address at a hadron collider. This talk will review a number of these scenarios and present the expectations for searches at an electron-positron collider such as the International Linear Collider. The cases discussed include SUSY in strongly or moderately compressed models, heavy neutrinos, heavy vector bosons coupling to the s-channel in $e^+e^-$ annihilation, and new scalars

Prospect of stau searches and measurements at the ILC

The direct pair-production of the tau-lepton superpartner, stau, is oneof the most interesting channels to search for SUSY. First of all the stau iswith high probability the lightest of the scalar leptons. Secondly thesignature of stau pair production signal events is one of the most difficultones, yielding to the 'worst' and so most global scenario for the searches.The current model-independent stau limits comes from analysis performed atLEP but they suffer from the low energy of this facility. The LHC exclusionreach extends to higher masses for large mass differences, but under strongmodel assumptions.The ILC, a future electron-positron collider with energy up to 1 TeV, is apromising scenario for SUSY searches. The capability of the ILC for determiningexclusion/discovery limits for the stau in a model-independent way is shown inthis contribution, together with an overview of the current state-of-the-art.A detailed study of the 'worst' scenario for stau exclusion/discovery takinginto account the effect of the stau mixing on stau production cross-sectionand efficiency is presented. For selected benchmarks, the prospect for measuringmasses and polarised cross-sections will be shown. The studies were done usingthe sgv fast simulation adapted to the ILD detector concept at the ILC

Chargino search at ILC

The lighter chargino (chi1) is a prime candidate to be thenext-to-lightest SUSY particle (the NLSP). Several analyses have beendone of chi1 pair-production at the ILC, at specific model-points,showing that detection and property-determination is possible, even forvery difficult cases. However, no recent studies have evaluated thereach of the ILC to detect chi1 pair production in general. In thiscontribution, cross sections for chi1 production at the ILC wereevaluated with a wide range of parameters. The aim of the study was todetermine the conditions for the lowest cross sections and comparethese worst-case values with an estimation of the cross section limitfor the observation of the lightest charginos at the ILC. The estimatedlimits were extrapolated from the studies performed at LEP, which canalso be regarded as a worst-case scenario

Search for new particles at the ILC

Although the LHC experiments have searched for and excluded many proposed new particles up to masses close to 1 TeV, there are many scenarios that are difficult to address at a hadron collider. This talk will review a number of these scenarios and present the expectations for searches at an electron-positron collider such as the International Linear Collider. The cases discussed include SUSY in strongly or moderately compressed models, heavy neutrinos, heavy vector bosons coupling to the s-channel in $e^+e^-$ annihilation, and new scalars

Control and Data Acquisition Systems at Petra III experiments

The Petra accelerator, built in 1978 at DESY for serving particle physicsexperiments, was rebuilt in year 2007 as one of the world-best synchrotronradiation sources. A control system for the beamlines was designed andimplemented before the start of the user operation in year 2009.The main solutions and challenges achieved with this control system relatedto crucial points like interfacing the devices, performing measurements,monitoring, storing and transfering data are described in this contribution,highlighting possible differences or similarities with control systems forparticle physics experiments.The system is also partially in use at the FLASH free electron laser at DESY

Chargino studies at ILC

The lighter chargino (chi1) is a prime candidate to be thenext-to-lightest SUSY particle (the NLSP). Several analyses have beendone of chi1 pair-production at the ILC, at specific model-points,showing that detection and property-determination is possible, even forvery difficult cases. However, no recent studies have evaluated thereach of the ILC to detect chi1 pair production in general. In thiscontribution, cross sections for chi1 production at the ILC wereevaluated with a wide range of parameters. The aim of the study was todetermine the conditions for the lowest cross sections and comparethese worst-case values with an estimation of the cross section limitfor the observation of the lightest charginos at the ILC. The estimatedlimits were extrapolated from the studies performed at LEP, which canalso be regarded as a worst-case scenario

ILC as a SUSY discovery and precision instrument

Data from the LHC at 7, 8, and 13 TeV have so far yielded no evidence for new particles beyond the 125 GeV Higgs boson, in particular, there have been no signs of SUSY. However, the complementary nature of physics with e$^{+}$e$^{-}$ collisions still offers many interesting scenarios in which SUSY can be discovered at the ILC. These scenarios take advantage of the capability of e$^{+}$e$^{-}$ collisions to observe events with missing four-momentum - a signature not available at hadron colliders, where only transverse imbalance is observable. Due to low backgrounds and trigger-less operation, detectors at e$^{+}$e$^{-}$ colliders can observe events with much less visible energy than what is possible at hadron colliders. In this contribution, we will present detailed simulation studies done with the ILD concept at the ILC. These studies include simulation of the full SM background, as well as realistic accelerator conditions. We will show results both on expected discovery and exclusion reaches for the most challenging SUSY channels, such as higgsinos or winos at low mass differences. Evaluations of precision of model-parameter measurements, in case of discovery, will also be given. We also report on how such measurements can be used to put constraints on parts of the sparticle-spectrum beyond direct reach, and to discriminate between different models of SUSY breaking at high scales

ILC as a SUSY discovery and precision instrument

Data from the LHC at 7, 8, and 13 TeV have so far yielded no evidence for new particles beyond the 125 GeV Higgs boson, in particular, there have been no signs of SUSY. However, the complementary nature of physics with e+e- collisions still offers many interesting scenarios in which SUSY can be discovered at the ILC. These scenarios take advantage of the capability of e+e- collisions to observe events with missing four-momentum - a signature not available at hadron colliders, where only transverse imbalance is observable. Due to low backgrounds and trigger-less operation, detectors at e+e- colliders can observe events with much less visible energy than what is possible at hadron colliders. In this contribution, we will present detailed simulation studies done with the ILD concept at the ILC. These studies include simulation of the full SM background, as well as realistic accelerator conditions. We will show results both on expected discovery and exclusion reaches for the most challenging SUSY channels, such as higgsinos or winos at low mass differences. Evaluations of precision of model-parameter measurements, in case of discovery, will also be given. We also report on how such measurements can be used to put constraints on parts of the sparticle-spectrum beyond direct reach, and to discriminate between different models of SUSY breaking at high scales