R. Ciesielski

MBR Monte Carlo Simulation in PYTHIA8

We present the MBR (Minimum Bias Rockefeller) Monte Carlo simulation of (anti)proton-proton interactions and its implementation in the PYTHIA8 event generator. We discuss the total, elastic, and total-inelastic cross sections, and three contributions from diffraction dissociation processes that contribute to the latter: single diffraction, double diffraction, and central diffraction or double-Pomeron exchange. The event generation follows a renormalized-Regge-theory model, successfully tested using CDF data. Based on the MBR-enhanced PYTHIA8 simulation, we present cross-section predictions for the LHC and beyond, up to collision energies of 50 TeV.

Tests of OPERA RPC detectors

OPERA is part of the CNGS project and it is an experiment dedicated to the observation of long-baseline numu into nutau oscillations through tau appearance. Resistive Plate Chambers (RPCs) with bakelite electrodes are used to instrument the 2 cm gaps between the magnetized iron slabs of the two spectrometers. The RPC installation ended in may 2004 on the first spectrometer and in march 2005 on the second one. Before the installation, every RPC is subjected to a complete test chain in order to reject the poorer quality detectors. The tests are performed in dedicated facilities to ensure the proper RPC gluing, to measure its electrical properties and to verify the response to cosmic rays and the intrinsic noise levels. We have also tested the long term stability of real size OPERA RPC prototypes operated at cosmic ray fluxes for more than one year. On small size prototypes we are performing studies on the gas mixtures in order to reduce the total charge released in the gas for each detector count. The validation of the installed RPCs has been performed with pure nitrogen. A small part of them has been also tested with the gas mixture Ar/C2H2F4/i-C4H10 /SF6=75.4/20/4/0.6

The OPERA RPCs front end electronics; a novel application of LVDS line receiver as low cost discriminator

The OPERA spectrometer is built from two large dipoles instrumented with around 1000 Resistive Plate Chambers (RPCs), covering a surface of about 3350 m2, and digitally read out by means of almost 27000 strips. The huge number of channels, the inaccessibility of many parts of the detector and the wide uncertainty about the signal amplitude pushed to study a low cost, high sensitivity discriminator, and a very carefully designed layout for the read out system. Here we will present a novel application of LVDS line receiver as discriminator, showing that it exceeds the requirements of a large RPC based detector and offers the intrinsic advantages of a mature technology in terms of costs, reliability and integration scale. We will also present the layout of the read out system showing as the sensitivity and the noise immunity were preserved in a system where the front end electronics is far away from the detector.

Measurements of diffraction in p-p collisions in CMS

We present measurements of soft and hard diffraction at the LHC, including new measurements of inclusive singleand doublediffractive cross sections, as well as forward rapidity gap cross section, and measurements of diffractive dijets at 7 TeV. We also show the first candidates for central dijet production with both leading protons tagged at the LHC, using the combined CMS and TOTEM detectors.

Review of Diffraction at the LHC

We present the review of the recent results on diffraction from the LHC. Presented at EDSBlois2015 The 16th conference on Elastic and Diffractive Scattering REVIEW OF DIFFRACTION AT THE LHC∗ 1 Robert Ciesielski 2 The Rockefeller Univesity 1230 York Avenue, New York, NY 10065, USA 3 on behalf of the ALICE, ATLAS, LHCb, CMS and TOTEM Collaborations 4 We present the review of the recent results on diffraction from the LHC. 5 PACS numbers: 12.38.QK,13.85.-t,13.85.Dz,13.85.Lg 6

Charged and neutral current cross sections from HERA

The cross sections for inclusive neutral and charged current deep inelastic e±p scattering at high Q2 with polarised lepton beams at HERA-II are presented. The electroweak effects in spacelike scattering are highlighted and compared to the Standard Model prediction.