Anton Taurok

Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at s√ = 7 TeV

A bstractThe first measurement of the electroweak production cross section of a Z boson with two jets (Zjj) in pp collisions at

The CMS Drift Tube Trigger Track Finder

\sqrt{s}=7

The holographic bubble chamber experiment and the determination of the effective charmed quark mass and the K-factor for hadronic charm production

TeV is presented, based on a data sample recorded by the CMS experiment at the LHC with an integrated luminosity of 5 fb−1. The cross section is measured for the ℓℓjj (ℓ = e, μ) final state in the kinematic region mℓℓ> 50 GeV, mjj> 120 GeV, transverse momenta

The Level-1 Global Muon Trigger for the CMS Experiment

p_{\mathrm{T}}^{\mathrm{j}}>25

A 1-GHZ FLASH-ADC MODULE FOR THE TAGGING SYSTEM OF THE CP-VIOLATION EXPERIMENT NA48

GeV and pseudorapidity |ηj| < 4.0. The measurement, combining the muon and electron channels, yields σ = 154 ± 24 (stat.) ± 46 (exp. syst.) ± 27 (th. syst.) ± 3 (lum.) fb, in agreement with the theoretical cross section. The hadronic activity, in the rapidity interval between the jets, is also measured. These results establish an important foundation for the more general study of vector boson fusion processes, of relevance for Higgs boson searches and for measurements of electroweak gauge couplings and vector boson scattering.

Design and development of a graphical setup software for the CMS global trigger

Muons are among the decay products of many new particles that may be discovered at the CERN Large Hadron Collider. At the first trigger level the identification of muons and the determination of their transverse momenta and location are performed by the Drift Tube Trigger Track Finder in the central region of the CMS (Compact Muon Solenoid) experiment, using track segments detected in the Drift Tube muon chambers. Track finding is performed both in pseudorapidity and azimuth. Track candidates are ranked and sorted, and the best four are delivered to the subsequent stage, the Global Muon Trigger, which combines them with candidates found in the two complementary muon systems of CMS, the Resistive Plate Chambers and the Cathode Strip Chambers. The concept, design, control and simulation software as well as tests and the expected performance of the Drift Tube Trigger Track Finder system are described.

The level-1 global trigger for the CMS experiment at LHC

In the first holographic bubble chamber experiment — the HOBC experiment — we have accumulated a total of 40000 holograms with particle interactions. We have determined the total charm pair cross section inpN collisions to be 23.3−7.7+10 μb and 3.6−1.7+2.3 μb for 360 and 200 GeV/c incident protons respectively. We have assumed a linear dependence of the cross section on the atomic number of the target. This experiment has demonstrated the feasibility of holographic recording in small bubble chambers. Assuming that the charm cross section can be described by the standard QCD factorized expression with gluon fusion and quark-antiquark annihilation, we have used our measured charm cross sections with other measurements to determine the effective charmed quark mass to be 1.8−0.35+0.25 GeV/c2. TheK factor, which describes the importance of the higher order corrections, is calculated to be 9.8−6.9+12.5 (See noted added in proof.)

Implementation and synchronisation of the first level global trigger for the CMS experiment at LHC

The three independent Level-1 muon trigger systems in CMS deliver up to 16 muon candidates per bunch crossing, each described by transverse momentum, direction, charge and quality. The Global Muon Trigger combines these measurements in order to find the best four muon candidates in the entire detector and attaches bits from the calorimeter trigger to denote calorimetric isolation and confirmation. A single-board logic design is presented: via a special front panel and a custom back plane more than 1100 bits are received in every bunch crossing and processed without deadtime by pipelined logic implemented in five large and several small Xilinx FPGAs.

The central trigger control system of the CMS experiment at CERN

Abstract An 8-bit 1-GHz Flash-ADC module has been developed for the tagging system of the CP-violation experiment NA48 at CERN. The module contains two independent channels with 500 MHz sampling rate, which can be interleaved to obtain one channel with an effective sampling rate of 1 GHz. Both FADC chips run continuously and data samples are stored for 524 μs in a ringbuffer memory until they are overwritten by new data. During their “lifetime” data can be extracted from the ringbuffer without disturbing the write cycles. The module fits into a VXI-D crate and uses the VME bus. The design, construction, operation and performance of this module are presented.

Measurement of the ratio G ( K L ? p + p - ) / G ( K L ? p e ? ) and extraction of the CP violat

The CMS experiment at CERNs Large Hadron Collider will search for new physics at the TeV energy scale. Its trigger system is an essential component in the selection process of potentially interesting events. The Global Trigger is the final stage of the first-level selection process. It is implemented as a complex electronic system containing logic devices, which need to be programmed according to physics requirements. It has to reject or accept events for further processing based on coarse measurements of particle properties such as energies, momenta, and location. Algorithms similar to the ones used in the physics analysis are executed in parallel during the event selection process. A graphical setup program to define these algorithms and to subsequently configure the hardware has been developed. The design and implementation of the program, guided by the principal requirements of flexibility, quality assurance, platform-independence and extensibility, are described.