Improved measurements of the b quark mass at LEP María José Costa (IFIC-València) ICHEP 2002 Amsterdam Motivations to measure m b at M Z. Observables sensitive.

Slides:

Advertisements

Similar presentations

Final State QCD LEP, part 2 Nuno Anjos LIP, Lisbon – DELPHI and L3 Collaborations EPS HEP05 Lisboa, Portugal July 22 nd, a) Single Particle.

Advertisements

Gyöngyi Baksay Florida Institute of Technology

Peter Schleper, Hamburg University SUSY07 Non-SUSY Searches at HERA 1 Non-SUSY Searches at HERA Peter Schleper Hamburg University SUSY07 July 27, 2007.

Low x meeting, Sinai Alice Valkárová on behalf of H1 collaboration LOW x meeting 2005, Sinaia H1 measurements of the structure of diffraction.

Maria Jose Costa, CERN DIS 2004 April 14 th -18 th 2004, Slovakia b -mass effects in 3 and 4 jets events with the DELPHI detector at LEP b u,d,s.

Electroweak b physics at LEP V. Ciulli INFN Firenze.

Studies of the hadronic decays of Z bosons at LEP Alessandro De Angelis University of Udine and INFN Trieste ICHEP 2000 Osaka, July )OPAL: Charge.

Jet and Jet Shapes in CMS

Recent Electroweak Results from the Tevatron Weak Interactions and Neutrinos Workshop Delphi, Greece, 6-11 June, 2005 Dhiman Chakraborty Northern Illinois.

Peter Loch University of Arizona Tucson, Arizona USA

Multijets in e+e- annihilations Hasko Stenzel FRIF workshop e+e- multi-jets H.Stenzel 2 Outline  Jet rates and algorithms  energy evolution.

Ursula Bassler, LPNHE-Paris, RUN II MC workshop 1 Monte Carlo Tuning: The HERA Experience Monte Carlo Models for DIS events Description of inclusive hadronic.

VALENCIA b mass effects at the Z 0 peak from 3 and 4 jet events P. Bambade, M.J. Costa, J. Fuster and P. Tortosa b mass effects have been.

Erik MaddoxBEACH 2004, Chicago1 Heavy flavour production at HERA Outline: Introduction Charm production Beauty production Conclusions Erik Maddox (NIKHEF/UvA)

 s determination at LEP Thorsten Wengler University of Manchester DIS’06, Tsukuba, Japan.

W/Z PRODUCTION AND PROPERTIES Anton Kapliy (University of Chicago) on behalf of the ATLAS collaboration PHENO-2012.

W properties AT CDF J. E. Garcia INFN Pisa. Outline Corfu Summer Institute Corfu Summer Institute September 10 th 2 1.CDF detector 2.W cross section measurements.

Measurement of α s at NNLO in e+e- annihilation Hasko Stenzel, JLU Giessen, DIS2008.

Working Group C: Hadronic Final States David Milstead The University of Liverpool Review of Experiments 27 experiment and 11 theory contributions.

26th July 2002 Richard Hawkings1 Richard Hawkings (CERN/OPAL) Heavy flavour electroweak physics at LEP1/SLD  Heavy flavour electroweak measurements at.

Direct di-  Tevatron On behalf of the & Collaborations Liang HAN University of Science & Technology of China (USTC)

16/04/2004 DIS2004 WGD1 Jet cross sections in D * photoproduction at ZEUS Takanori Kohno (University of Oxford) on behalf of the ZEUS Collaboration XII.

22 nd Winter Workshop on Nuclear Dynamics “Can STAR p+p data help constrain fragmentation functions for strange hadrons” Mark Heinz (for the STAR collaboration)

David Milstead – Experimental Tests of QCD ITEP06 Winter School, Moscow Experimental Tests of QCD at Colliders: Part 2 David Milstead Stockholm University.

W Mass and Width at LEP2 Jeremy Nowell ALEPH / Imperial College London On behalf of the LEP collaborations.

7 th April 2003PHOTON 2003, Frascati1 Photon structure as revealed in ep collisions Alice Valkárová Institute of Particle and Nuclear Physics Charles University.

Emily Nurse W production and properties at CDF0. Emily Nurse W production and properties at CDF1 The electron and muon channels are used to measure W.

1 TOP MASS MEASUREMENT WITH ATLAS A.-I. Etienvre, for the ATLAS Collaboration.

Bottom and Charm Quark Production in Two-Photon Collisions at LEP Wilfrid da Silva LPNHE, Paris july 2003 J/  production in  collisions (DELPHI)

Isolated Prompt Photon Production in Photon-Photon Collisions at  s ee = GeV T. Schörner-Sadenius on behalf of the OPAL Collaboration ICHEP 2002,

Andrey Korytov, University of Florida ICHEP2004 August 15-22, 2004, Beijing 1 Quark and Gluon Jet Fragmentation Differences Abstracts covered in this talk.

High P T Inclusive Jets Study High P T Inclusive Jets Study Manuk Zubin Mehta, Prof. Manjit kaur Panjab University, Chandigarh India CMS Meeting March,

Jets and α S in DIS Maxime GOUZEVITCH Laboratoire Leprince-Ringuet Ecole Polytechnique – CNRS/IN2P3, France On behalf of the collaboration On behalf of.

Parton energy loss Marco van Leeuwen. 2 Hard probes of QCD matter Use ‘quasi-free’ partons from hard scatterings to probe ‘quasi-thermal’ QCD matter Interactions.

24/08/2009 LOMONOSOV09, MSU, Moscow 1 Study of jet transverse structure with CMS experiment at 10 TeV Natalia Ilina (ITEP, Moscow) for the CMS collaboration.

Jet Studies at CDF Anwar Ahmad Bhatti The Rockefeller University CDF Collaboration DIS03 St. Petersburg Russia April 24,2003 Inclusive Jet Cross Section.

Measurement of b-quark mass effects for multi-jet events at LEP Juan A. Fuster Verdú EPS-2003 Aachen, July 2003.

1 Heavy Flavour Content of the Proton Motivation Experimental Techniques charm and beauty cross sections in DIS for the H1 & ZEUS Collaborations Paul Thompson.

Charged Particle Multiplicity, Michele Rosin U. WisconsinQCD Meeting May 13, M. Rosin, D. Kçira, and A. Savin University of Wisconsin L. Shcheglova.

ATLAS Higgs Search Strategy and Sources of Systematic Uncertainty Jae Yu For the ATLAS Collaboration 23 June, 2010.

1 Forward Jet/  0 Production in DIS at HERA On behalf of the H1 and ZEUS Collaborations ICHEP August 2004, Beijing Didar Dobur, University of Freiburg.

A. Bertolin on behalf of the H1 and ZEUS collaborations Charm (and beauty) production in DIS at HERA (Sezione di Padova) Outline: HERA, H1 and ZEUS heavy.

R LEP2 Yoram Rozen – Technion, Israel for the OPAL Collab.

Moriond EW 2007Oliver Stelzer-Chilton - Oxford1 First Run II Measurement of the W Boson Mass with CDF on behalf of the CDF Collaboration Oliver Oliver.

Mean Charged Multiplicity in DIS, Michele Rosin U. WisconsinZEUS Collaboration Meeting, Oct. 21st Analysis Update: Mean Charged Multiplicity in.

Costas Foudas, Imperial College, Jet Production at High Transverse Energies at HERA Underline: Costas Foudas Imperial College

Color Reconnection in W Pair Events Guillaume Leibenguth Université Catholique de Louvain Belgium DIS 2003, St. Petersburg On behalf of the LEP collaborations.

Stano Tokar, slide 1 Top into Dileptons Stano Tokar Comenius University, Bratislava With a kind permissison of the CDF top group Dec 2004 RTN Workshop.

Jorgen D’Hondt University of Brussels - DELPHI Collaboration l WW  qqQQ events collected at LEP2 l Colour Reconnection effect at LEP2 l Model dependent.

Tools08 1 st July1 PDF issues for Monte Carlo generators Peter Richardson IPPP, Durham University.

Royal Holloway Department of Physics Top quark pair cross section measurements in ATLAS Michele Faucci Giannelli On behalf of the ATLAS collaboration.

1 Proton Structure Functions and HERA QCD Fit HERA+Experiments F 2 Charged Current+xF 3 HERA QCD Fit for the H1 and ZEUS Collaborations Andrew Mehta (Liverpool.

Joshua Moss (Ohio State University) on behalf of the ATLAS Collaboration ICHEP 2012, Melbourne 6 July 2012 ATLAS Electroweak measurements of W and Z properties.

ICHEP 2002, Amsterdam Marta Calvi - Study of Spectral Moments… 1 Study of Spectral Moments in Semileptonic b Decays with the DELPHI Detector at LEP Marta.

Inclusive jet photoproduction at HERA B.Andrieu (LPNHE, Paris) On behalf of the collaboration Outline: Introduction & motivation QCD calculations and Monte.

Electroweak physics at CEPC

Quark and Gluon Jet Fragmentation Functions as measured by OPAL

Studies of prompt photon identification and 0 isolation in first p-p collisions at √s=10 TeV May 20, 2009 Meeting Frascati Raphaëlle Ichou.

Implications of First LHC Data: Underlying Event Measurements

Sílvia Bravo i Gallart IFAE, Barcelona Moriond-QCD, 18 March 2002

Measurement of jet properties with the ATLAS detector

Open Heavy Flavour Production at HERA

DIS 2004 XII International Workshop

Inclusive Jet Cross Section Measurement at CDF

ATLAS 2.76 TeV inclusive jet measurement and its PDF impact A M Cooper-Sarkar PDF4LHC Durham Sep 26th 2012 In 2011, 0.20 pb-1 of data were taken at √s.

Internal structure of f0(980) meson by fragmentation functions

Heavy Flavour Content of the Proton

Inclusive Jet Production at the Tevatron

Measurement of b-jet Shapes at CDF

b-Quark Production at the Tevatron

Presentation transcript:

Improved measurements of the b quark mass at LEP María José Costa (IFIC-València) ICHEP 2002 Amsterdam Motivations to measure m b at M Z. Observables sensitive to m b at M Z. Experimental strategy. Systematic uncertainties. Results (DELPHI and OPAL). Conclusions.

27 July 2002M.J. Costa2 Motivations to measure m b at M Z Direct and independent measurement of the b mass at high energy. In the case of m b (  ), test of the evolution with the scale. m b (M Z ) is a basic input parameter to test m b -m  unification predicted by GUT models at M GUT ~10 16 GeV.

27 July 2002M.J. Costa3 Observables sensitive to m b at M Z DELPHI: n = 3, 4 jets Durham, Cambridge. OPAL: n = 3 jets Jade, E0,P, P0, E,Geneva,Durham. Due to the mass effect, massive quarks radiate less gluons than light quarks. m b (M Z )   s universality For inclusive observables, b mass effects are negligible at LEP (m b 2 /m Z 2  0.3%). For jet rates:  y c  (m b 2 /m Z 2 )/y c sizeable effects. The observable used: e+e+ e-e- q q NLO for n = 3 jets LO for n = 4 jets

27 July 2002M.J. Costa4 Experimental Strategy Data Hadronic selection Jet reconstuction Tagging Detector simulation DELPHI TAGGING Pythia Herwig Hadronization

27 July 2002M.J. Costa5 Systematic uncertainties Detector resolution. Tagging (  b, R b, n ch B-decays,  b,,  c ). gluon splitting rates. Detector and physics modelling: Hadronization: Tuning of the fragmentation parameters. Model (string or cluster). b fragmentation function. b mass parameter in the generator. ycyc DELPHI

27 July 2002M.J. Costa6 DELPHI results Durham: Cambridge:

27 July 2002M.J. Costa7 Modelling of the generators First look into 4 jets Data lies between the LO predictions for M b = GeV. DELPHI

27 July 2002M.J. Costa8 OPAL results The 7 results of m b (M Z ) were combined:

27 July 2002M.J. Costa9 Conclusions All measurements of m b (M Z ) are compatible. The shift m b (M  /2) -m b (M Z ) has been observed with almost 4  in agreement with the QCD prediction. b mass effects have been measured with 4 jet events! NLO calculations are welcome! The values obtained for M b (  4.2 GeV) are lower than the ones obtained at low energy. A better understanding of the mass entering in the MC could lead to a precision on m b (M Z ) of about MeV.