Silicon Vertex Tracker for PHENIX Upgrade at RHIC: Capabilities and Detector Technology

نویسنده

  • Rachid Nouicer
چکیده

From the wealth of data obtained from the first three years of RHIC operation, the four RHIC experiments, BRAHMS, PHENIX, PHOBOS and STAR, have concluded that a high density partonic matter is formed at central Au+Au collisions atsNN = 200 GeV. The research focus now shifts from initial discovery to a detailed exploration of partonic matter. Particles carrying heavy flavor, i.e. charm or beauty quarks, are powerful tool for study the properties of the hot and dense medium created in high-energy nuclear collisions at RHIC. At the relatively low transverse momentum region, the collective motion of the heavy flavor will be a sensitive signal for the thermalization of light flavors. They also allow to probe the spin structure of the proton in a new and precise way. An upgrade of RHIC (RHIC-II) is intended for the second half of the decade, with a luminosity increase to about 20-40 times the design value of 8 × 1026 cm−2 s−1 for Au+Au, and 2 × 1032 cm−2 s−1 for polarized proton beams. The PHENIX collaboration plans to upgrade its experiment to exploit with an enhanced detector new physics then in reach. For this purpose, we are constructing the Silicon Vertex Tracker (VTX). The VTX detector will provide us the tool to measure new physics observables that are not accessible at the present RHIC or available only with very limited accuracy. These include a precise determination of the charm production cross section, transverse momentum spectra at high-pT region for particles carrying beauty quarks as well the detection of recoil jets in direct photon production. The VTX detector consists of four layers of barrel detectors located in the region of pseudorapidity |η |< 1.2 and covers almost 2π azimuthal angle. The pseudorapidity, η , is defined as η =−ln[tan(θ/2)], where θ is the emission angle relative to the beam axis. The inner two silicon barrels consists of silicon pixel sensors and their technology is the ALICE1LHCb sensor-readout hybrid, which was developed at CERN for the ALICE and LHCb experiments. The outer two barrels consists of silicon stripixel detector with a new "spiral" design, single-sided sensor with 2-dimensional (X-U) read-out. In this paper, we will provide details of the physics capability added to PHENIX by the new central silicon vertex tracker, the status of the project, including technology choices used in the design, performance of individual silicon sensor and silicon detector prototype.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Study of the Gluon Polarization in the Proton with a Silicon Vertex Upgrade at Rhic/phenix

PHENIX has a well defined program for measuring the polarized gluon distribution in the nucleon. The measurements of gluon polarization via the directphoton production and the heavy-flavor production can be significantly improved by the silicon vertex tracker upgrade. We have studied the possible improvements of the gluon polarization measurements using Monte Carlo simulation and they are shown...

متن کامل

An Integrated Tracker for STAR

The STAR experiment at the Relativistic Heavy Ion Collider RHIC studies the new state of matter produced in relativistic heavy ion collisions and the spin structure of the nucleon in collisions of polarized protons. In order to improve the capabilities for heavy flavor measurements and the reconstruction of charged vector bosons an upgrade of the tracking system both in the central and the forw...

متن کامل

D0 Silicon Microstrip Tracker Sergey Burdin for D0 Collaboration

The D0 Run II silicon microstrip tracker (SMT) has 3 square meters of Si area. There are 792,576 channels read out by 6192 SVXIIe chips on 912 read out modules. The SMT provides track and vertex reconstruction capabilities over the full pseudorapidity coverage of the D0 detector. The full detector has been running successfully since April 2002. This presentation covers the experience in commiss...

متن کامل

707: the Dd Detector Upgrade at Fermilab

The DD detector at the Fermilab Tevatron is undergoing a major upgrade to prepare for data taking in the Main Injector era with luminosities reaching 210 32 cm ?2 s ?1. The upgrade includes a new central tracking array, new muon detector components, and electronic upgrades to many subsystems. The DD upgraded detector will be operational for Run II in early 2000. 1 Overview of the Upgrade The DD...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2008