The absence of any significant signal for Physics Beyond the Standard Model from the experiments at the LHC so far has led to expanding the search space for new exotic particles and effects. One direction that has recently drawn increased attention is the search for new long-lived particles, such as monopoles, dark photons, weakly interacting neutral particles, heavy stable charge particles...
The observation of single top quark production in association with a Z boson and a quark (tZq) will be reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017, and correspond to an integrated luminosity of...
In this analysis, the first evidence of events consistent with the production of a single top quark in association with a photon is reported. The analysis is based on proton-proton collisions at s√= 13 TeV and recorded by the CMS experiment in 2016, corresponding to an integrated luminosity of 35.9 fb−1. Events are selected by requiring the presence of a muon (μ), a photon (γ), an imbalance in...
Measurements of the top quark polarization and top quark pair (tt¯) spin correlations are discussed in this talk. Events containing two leptons produced in proton-proton collisions at a center-of-mass energy of s√= 13 TeV are going to be presented including a set of parton-level normalized differential cross sections, sensitive to each of the independent coefficients of the spin-dependent...
The Higgs boson mass and couplings to the electroweak gauge bosons were measured early after its discovery during LHC Run I. Sensitivity to the Higgs couplings to fermions however has required the large amount of data collected at a center-of-mass energy of 13 TeV during LHC Run II. Recent measurements of the Higgs boson couplings to tau leptons as well as top and bottom quarks mark crucial...
Searches for the production of dark matter are since several years a top priority at the CERN LHC. We present the landscape of dark matter searches at the LHC, and illustrate this with recent searches for dark matter in various final states with the CMS experiment. We focus on searches with invisible particles recoiling against standard model particles, and place this in the broader context of...
The goal of the Mini Space Particle Telescope (MINI-SPT) is to create a rad-hard, fast, compact, low power, weight and cost, particle detector system compatible with CubeSat standards. Direct measurement of the charged particle energies will be performed in crystal calorimeter. Moreover, time-of-flight with up/down separation, seven dE/dX samplings in silicon pixel and scintillator detectors,...
Physicists performing LHC data analyses, are required to be well-versed in programming and the particular analysis framework of the associated experiment. The steep learning curve related to these erects a barrier between the data and the physicist who may simply wish to try out an analysis idea.
The abundance of inexpensive, powerful, easy to use computing power leads to a fundamental shift...
Many key parameters of the Standard Model are strictly connected to the Higgs boson properties. The precision measurement of these quantities is an important result in itself and would constitute a major physics goal of the CMS experiment at LHC. In addition, any anomaly with respect to the Standard Model predictions would be indirect evidence of new physics and could hint at the energy scale...
The presentation introduces projects for future colliders, presenting the status of their current planning, and the main constraints of beam conditions on the associated experiments. The detector concepts proposed for these experiments are then briefly presented, emphasizing the common and specific aspects resulting from performance and operation requirements. Based on these considerations,...
The excellent performance of the Compact Muon Solenoid (CMS) experiment at the LHC has made a number of key observations in the exclusive processes and hence probing the Standard Model (SM) in a unique way. This presentation will review recent results on the measurement of Exclusive processes using the data recorded by the CMS detector. Evidence for light-by-light scattering in ultraperipheral...
We present a search for nonresonant excesses in the invariant mass spectra of electron and muon pairs. The results are based on the data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment in 2016, corresponding to a total integrated luminosity of 36/fb. No significant deviation from the standard model is observed and limits are set at 95%...
I will present the status and prospects of SUSY/BSM Higgs search at LHC. The summary will be given for Run I and Run II searches for additional Higgs bosons in ATLAS and CMS collaboration as well as for the searches for the non-Standard Model decays of discovered Higgs boson with mass 125 GeV. Searches for additional Higgs bosons will cover the searches for Higgs bosons with masses both...
A new general purpose fixed target experiment is proposed at the CERN SPS accelerator which is aimed to search for hidden particles beyond the Standard Model and make measurements with tau neutrinos. The experiment will use decays of charm and beauty mesons to search for Heavy Neutral Leptons (HNLs), also known as “sterile neutrinos”, which are sub-electroweak region particles introduced by...
In particular, ions affect the signal received from the detector by disrupting the electrical field configuration in some types of gas detectors (such as TPC's, Micromegas, Drift tubes). For this reason, scientists have tried various methods to eliminate these effects of ions, but it can not be said that any success yet. In recent years, our studies have shown that; we must characterize their...
Journey into CERN membership and progress made since then. Explains the development of on-going participation of Turkey at CERN from the industrial stand point.
I. O. Atakisi1), J. Baechler2), S. Cerci3), D. Druzhkin2), M. Kaya1), B. Kaynak4), M. Khakzad5),
A. Mestverishvili6), S. Ozkorucuklu4), A. Penzo6), V. Samoylenko7), D. Sunar Cerci3), M. J. Wagner2)
1) Marmara University, Istanbul; 2) CERN, Geneva; 3) Adiyaman University, Adiyaman; 4) Istanbul University, Istanbul; 5) IPM, Teheran, 6) University of Iowa, Iowa City, 7) NRC-KI-IHEP,...
Recent developments in Particle Flow Algorithms and Machine Learning Algorithms gave rise to the idea of high granularity detector systems. With the advances in the development of integrated detector electronics and the accumulated expertise in novel active media, many ideas have already started to be realized. The future implementations are not only limited by the development of novel...
Recent years have been an exciting period for hadronic spectroscopy. Along with discoveries of new single heavy and doubly heavy baryons, many states that do not seem to fit in the conventional quark-anti-quark (for mesons) or three quark (for baryon) pictures have been observed. One of the first candidates for a non-conventional meson was X(3872). Although there are many proposals for its...
The architecture of the present RPC trigger system in the ATLAS muon barrel was designed according to a reference luminosity of 1034 cm-2 s-1 with a safety factor of 5, with respect to the simulated background rates corresponding to about 300 fb-1 integrated luminosity. HL-LHC will reach a 7.5 times higher luminosity, an expected integrated luminosity of 5000 fb-1 and a total duration extended...
The soft and hard QCD processes are analyzed by the ATLAS and CMS experiments using samples of proton-proton collisions collected by the LHC at the center of mass beams energy equal to 7, 8 and 13 TeV. Measurements of jet production rates, jet properties, particle multiplicity and momentum spectra, scaling and correlations are presented. The results are compared to predictions of theoretical...
Jets are the physical manifestations of the quarks and gluons produced in high-energy proton-proton collisions. They are among the most ubiquitous physics objects measured at the LHC, and their production and complex evolution is governed by the proton parton distribution functions (PDFs), the strong coupling constant (αs) and the rules of Quantum Chromodynamics (QCD). Yet they can often be...
The Big-Bang has been the most accepted theory in cosmology due to the cosmic microwave background, the cosmic red-shift and the abundance of light elements in the universe. However, this scenario leads to the most important and unsolved problems such as singularity, cosmic coincidence, big crunch, big rip, horizon, oscillation, the emergence of the galaxies, matter distribution and the...
Nuclear technology is a new era for Turkey. The first nuclear power plant in Turkey will be constructed at Akkuyu, in Mersin Province. It is planned to start operating in 2023. It is also planned to construct additional nuclear power plants in Sinop and İğeada in the near future. Monitoring these nuclear reactors must be one the highest priority issue for nuclear safety in Turkey. In this...
Because of their short lifetime (τ ~ 10 -23 s), hadronic resonances are very important probes to understand the evolution of the medium and particle production mechanisms in heavy ion collisions. Properties of the resonances such as mass, width and yield may be modified by the medium. These modifications provide information about possible medium effects, for instance suppression of the...
I will discuss some recent important experimental and theoretical progresses made in the field of both the standard hadrons and exotics. Among these progresses, the developments on the lepton flavour universality violation (LFUV) are of great importance: The experimental data show significant deviations from the SM predictions in some tree-level hadronic transitions. I will also discuss the...
This talk will review the latest measurements from the presently most precise cosmological probes, namely the cosmic microwave background, distant type Ia supernovae and baryonic acoustic oscillations. The agreement between these data and the ΛCDM model - the standard model of cosmology - will be highlighted. Constraints from these data on inflation and neutrino masses will also be shown. The...
In the CMS experiment, events of potential physics interest are selected by the trigger system, which consists of two-level triggers, the Level-1 (L1) Trigger and the High-Level Trigger (HLT).
The L1 Trigger is a hardware trigger that reduces the rate down to 100kHz, while the HLT is a software trigger running in a computer farm that reduces the rate from 100 kHz to about 1 kHz. The HLT runs...
The European Particle Physics community is in the process of updating its strategy for the future. The process was officially launched by the CERN Council in fall 2018 and is expected to be completed by May 2020. The strategy update is based on inputs received from thematic and national communities and the scientific debate is conducted during an Open Symposium. I will report on the various...
Axion-like particles (ALPs) appear from spontaneous global symmetry breaking in many extensions of the Standard Model (SM). In this paper, we find bounds on ALP (a) model parameters at the LHC from the ALP production associated with a photon and a jet (a+γ+j) as well as single top and top quark pairs (t+j+a, tt¯+a) in a model independent approach. In particular, it is shown that the ALP...
we explore the signature of a simplified model which includes a new singlet scalar state and a vector like quark at future lepton colliders. In particular, we study the production of the new singlet scalar in association with a photon, which proceeds through loop level diagrams involving vector like top quark partner, at future e−e+ colliders at different center-of-mass energies.
The talk will briefly review the key steps in establishing the Standard Model, in particular, the discovery of the W and Z in the UA1 experiment bosons, how we launched the LHC and the main steps in designing the CMS detector, largely on basis of the experience with UA1. Then I briefly review the discovery of the Higgs boson, the present day status of Higgs studies and few related salient...
