ProfessorElliot Leader
Distinguished Research Fellow
Department of Physics - Faculty of Natural Sciences
Orcid identifier0000-0002-4052-4058 (opens in a new tab)
- Distinguished Research FellowDepartment of Physics - Faculty of Natural Sciences
- 020 7594 7792 (Work)
- 504, Blackett Laboratory, South Kensington Campus, United Kingdom
RESEARCH
Overview
Theory of elementary particles.
Quantum Chromodynamics
High energy interactions and spin-dependent dynamics.
Royal Society Joint Project Grant with the Bulgarian Academy of Sciences: 2001-2003, £12000; 2005-2007, £12000. Visits to Imperial College of 2 months each, per year, by Dr Stamenov and Dr Christova of the Institute for Nuclear Research, Sofia.
Royal Society Incoming Short Visit Grant: 3 months 2006, £3814. Visit to Imperial College by Dr S Aghaev of Baku State University, Azerbaijan
European Initiative Framework 6: member of I3 HP Transversity Network. Total grant 400,000 euros.
Invited Lectures and Presentations
1) 'What do we presently know about about the quark transverse spin densities?' DESY, Zeuthen, Germany, July 2001
2) 'First ever determination of the pion fragmentation functions without assumptions about favoured and unfavoured transitions' SLAC, Stanford, California, USA, September 2001.
3)'The spin of elementary particles' Xeme Seminaire Rhodanien de Physique, Turin, Italy, March 2002
4)'Our present knowledge of the Internal Structure of the Nucleon' Institut de Physique Nucleaire de Orsay, October 2002
5)'Can the plarization of the strange quark be positive, and why does it matter?' COMPASS CERN, Geneva, August 2003; New York University, USA, September 2003; Brookhaven National Laboratory, Long Island , USA, September 2003
6)'On the non-vanishing of the Collins mechanism' COMPASS, CERN, Geneva, January 2004
7) Three lectures on 'Nucleon Spin' 43rd International Winter School on Theoretical Physics, Schladming, Austria, March 2005
8) 'Higher twist and Positivity Constraints in Polarized Deep Inelastic Scattering' Brookhaven National Laboratory, Long Island, USA, September 2005
9) 'Controversial issues in the Polarized PDFs: Delta-s, Delta-G, positivity and higher twist' DIS2006, Tsukuba, Japan, April 2006
10) 'Deriving angular momentum sum rules: the good the bad and the ugly' RHIC and AGS Annual Users Meeting, Brookhaven National Laboratory, Long Island, USA, June 2006
11) 'Spin in relativistic quantum theory', Workshop on QCD Spin Physics, Trento, 2006
12) 'Longitudinal spin physics', Varenna, 2007
13) 'Gluon polarization and higher twist effects', DIS2008, London, 2008
14) 'The importance and present status of gluon polarization' Intl. Workshop on Hadron Strycture, Turin, 2008
15) 'The transverse angular momentum sum rule', Transversity2008, Ferrara, 2008
16) 'The polarized gluon density', Symposium on Approaches to QCD, Oberwolz, 2008
17) 'The importance and present status of gluon polarization', Old Dominion University, and Jefferson National laboratory, Virginia, 2008
18) 'The longitudinal spin structure of the nucleon', 12th HANUC Lecture week, Turin, 2009
19) 'Some comments on angular momentum sum rules and off-forward PDFs', Berkeley Workshop on Nucleon Spin Physics, Berkeley, California and Brookhaven National Laboratory, New York and European Centre for Theoretical Physics, Trento, 2009
20) 'Aspects of LSS polarized DIS analysis', Berkeley Workshop on Nucleon Spin Physics, Berkeley, California, 2009
21)'Some surprises on taking the parton model serously', Brookhaven National Laboratory, New York, 2009
22) On the controversy in defining quark and gluon angular momentum', Brookhaven National Laboratory, New York, 2010
23) 'Polarized PDFs and higher twist', Workshop on High Energy Strong Interactions, Kyoto, 2010
24) 'Polarized PDFs and higher twist from NLO analysis of DIS and SIDISD', Workshop on Hard Meson and Photon Production, European Centre for Theoretical Physics, Trento, 2010
25) 'Some comments on the derivation of the tyransverse angular momentum sum rule', Brookhaven National Laboratory, New York, 2010
26) 'Polarized PDFs and higher twist from NLO analysis of DIS and SIDIS: some controversial issues', Jefferson National laboratory, Virginia, 2010
27) 'Comments onpolarized parton densities, on the validity of angular momentum sum rules and on the definition of parton angular momentum', SACLAY, Paris, 2010
28) 'Transverse angular momentum: new results', TRANSVERSITY2011, Veli Losinj, 2010
29) ' Transverse angular momentum sum rules', Workshop on Orbital Angular Momentum, Institute for Nuclear Theory, Seattle, Washington, 2011
30) 'On the controversy concerning the definition of quark and gluon angular momentum', Workshop on Orbital Angular Momentum, Institute for Nuclear Theory, Seattle, Washington, 2012
31) 'New relation between tranverse angular momentum and generalized parton distributions', CERN, 2012
32) The angular momentum controversy: what's it all about and does it matter? University of Cambridge, 2012
33) The angular momentum controversy: what's it all about and does it matter? Ruhr-Universitat, Bochum, Germany, 2012
Other Significant Activities
Member International Advisory Committee for:1) 9th Blois Workshop, Prague, 20012) Advanced Study Institute, Prague, 2001, 2002,2003, 20043) International Conference 'Testing QCD through Spin Observables in Nuclear Targets', Charlottsville, Virginia, 20024) International Workshop on Transverse Polarisation Phenomena in Hard Processes, Como, Italy, 20055) International Workshop 'QCD-N'06', Rome, Italy, 2006
Co-organiser (with W.Vogelsang, Brookhaven): QCD Spin Physics, 6-week postgraduate school at ECT*, Trento, Italy, October 2006.
Assessor for the Royal Society Networking Scheme (2005,2006,2007)
Plenary Lectures
'Polarized parton densities and fragmentation functions' International Workshop on Hadron Structure and Hadron Spectroscop' :, ICTP, Trieste, Italy, February 2002
'The Odderon: Past and Present': Internatonal Workshop on Odderon Searches at RHIC, Brookhaven National Laboratory, Long Island, USA, September 2005
'The controversial role of strangeness in the spin structure of the nucleon' : International Conference PAVI06, Melos, Greece, May 2006
'The spin crisis in the parton model - past, present and future' : RHIC and AGS Annual Users Meeting, Brookhaven National Laboratory, Long Island, USA, June 2006
'The power of Spin:A Scalpel-like Probe of Theoretical Ideas' : !8th International Spin Physics Symposium, Charlottesville, Virgina, October 2008
'The angular momentum controversy: what's it all about and does it matter' : 20th INternational Spin Physics Symposium, Dubna, Russia, September 2012
Theory of elementary particles.
Quantum Chromodynamics
High energy interactions and spin-dependent dynamics.
Royal Society Joint Project Grant with the Bulgarian Academy of Sciences: 2001-2003, £12000; 2005-2007, £12000. Visits to Imperial College of 2 months each, per year, by Dr Stamenov and Dr Christova of the Institute for Nuclear Research, Sofia.
Royal Society Incoming Short Visit Grant: 3 months 2006, £3814. Visit to Imperial College by Dr S Aghaev of Baku State University, Azerbaijan
European Initiative Framework 6: member of I3 HP Transversity Network. Total grant 400,000 euros.
Invited Lectures and Presentations
1) 'What do we presently know about about the quark transverse spin densities?' DESY, Zeuthen, Germany, July 2001
2) 'First ever determination of the pion fragmentation functions without assumptions about favoured and unfavoured transitions' SLAC, Stanford, California, USA, September 2001.
3)'The spin of elementary particles' Xeme Seminaire Rhodanien de Physique, Turin, Italy, March 2002
4)'Our present knowledge of the Internal Structure of the Nucleon' Institut de Physique Nucleaire de Orsay, October 2002
5)'Can the plarization of the strange quark be positive, and why does it matter?' COMPASS CERN, Geneva, August 2003; New York University, USA, September 2003; Brookhaven National Laboratory, Long Island , USA, September 2003
6)'On the non-vanishing of the Collins mechanism' COMPASS, CERN, Geneva, January 2004
7) Three lectures on 'Nucleon Spin' 43rd International Winter School on Theoretical Physics, Schladming, Austria, March 2005
8) 'Higher twist and Positivity Constraints in Polarized Deep Inelastic Scattering' Brookhaven National Laboratory, Long Island, USA, September 2005
9) 'Controversial issues in the Polarized PDFs: Delta-s, Delta-G, positivity and higher twist' DIS2006, Tsukuba, Japan, April 2006
10) 'Deriving angular momentum sum rules: the good the bad and the ugly' RHIC and AGS Annual Users Meeting, Brookhaven National Laboratory, Long Island, USA, June 2006
11) 'Spin in relativistic quantum theory', Workshop on QCD Spin Physics, Trento, 2006
12) 'Longitudinal spin physics', Varenna, 2007
13) 'Gluon polarization and higher twist effects', DIS2008, London, 2008
14) 'The importance and present status of gluon polarization' Intl. Workshop on Hadron Strycture, Turin, 2008
15) 'The transverse angular momentum sum rule', Transversity2008, Ferrara, 2008
16) 'The polarized gluon density', Symposium on Approaches to QCD, Oberwolz, 2008
17) 'The importance and present status of gluon polarization', Old Dominion University, and Jefferson National laboratory, Virginia, 2008
18) 'The longitudinal spin structure of the nucleon', 12th HANUC Lecture week, Turin, 2009
19) 'Some comments on angular momentum sum rules and off-forward PDFs', Berkeley Workshop on Nucleon Spin Physics, Berkeley, California and Brookhaven National Laboratory, New York and European Centre for Theoretical Physics, Trento, 2009
20) 'Aspects of LSS polarized DIS analysis', Berkeley Workshop on Nucleon Spin Physics, Berkeley, California, 2009
21)'Some surprises on taking the parton model serously', Brookhaven National Laboratory, New York, 2009
22) On the controversy in defining quark and gluon angular momentum', Brookhaven National Laboratory, New York, 2010
23) 'Polarized PDFs and higher twist', Workshop on High Energy Strong Interactions, Kyoto, 2010
24) 'Polarized PDFs and higher twist from NLO analysis of DIS and SIDISD', Workshop on Hard Meson and Photon Production, European Centre for Theoretical Physics, Trento, 2010
25) 'Some comments on the derivation of the tyransverse angular momentum sum rule', Brookhaven National Laboratory, New York, 2010
26) 'Polarized PDFs and higher twist from NLO analysis of DIS and SIDIS: some controversial issues', Jefferson National laboratory, Virginia, 2010
27) 'Comments onpolarized parton densities, on the validity of angular momentum sum rules and on the definition of parton angular momentum', SACLAY, Paris, 2010
28) 'Transverse angular momentum: new results', TRANSVERSITY2011, Veli Losinj, 2010
29) ' Transverse angular momentum sum rules', Workshop on Orbital Angular Momentum, Institute for Nuclear Theory, Seattle, Washington, 2011
30) 'On the controversy concerning the definition of quark and gluon angular momentum', Workshop on Orbital Angular Momentum, Institute for Nuclear Theory, Seattle, Washington, 2012
31) 'New relation between tranverse angular momentum and generalized parton distributions', CERN, 2012
32) The angular momentum controversy: what's it all about and does it matter? University of Cambridge, 2012
33) The angular momentum controversy: what's it all about and does it matter? Ruhr-Universitat, Bochum, Germany, 2012
Other Significant Activities
Member International Advisory Committee for:1) 9th Blois Workshop, Prague, 20012) Advanced Study Institute, Prague, 2001, 2002,2003, 20043) International Conference 'Testing QCD through Spin Observables in Nuclear Targets', Charlottsville, Virginia, 20024) International Workshop on Transverse Polarisation Phenomena in Hard Processes, Como, Italy, 20055) International Workshop 'QCD-N'06', Rome, Italy, 2006
Co-organiser (with W.Vogelsang, Brookhaven): QCD Spin Physics, 6-week postgraduate school at ECT*, Trento, Italy, October 2006.
Assessor for the Royal Society Networking Scheme (2005,2006,2007)
Plenary Lectures
'Polarized parton densities and fragmentation functions' International Workshop on Hadron Structure and Hadron Spectroscop' :, ICTP, Trieste, Italy, February 2002
'The Odderon: Past and Present': Internatonal Workshop on Odderon Searches at RHIC, Brookhaven National Laboratory, Long Island, USA, September 2005
'The controversial role of strangeness in the spin structure of the nucleon' : International Conference PAVI06, Melos, Greece, May 2006
'The spin crisis in the parton model - past, present and future' : RHIC and AGS Annual Users Meeting, Brookhaven National Laboratory, Long Island, USA, June 2006
'The power of Spin:A Scalpel-like Probe of Theoretical Ideas' : !8th International Spin Physics Symposium, Charlottesville, Virgina, October 2008
'The angular momentum controversy: what's it all about and does it matter' : 20th INternational Spin Physics Symposium, Dubna, Russia, September 2012