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T. Greenshaw

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University of Oxford

Oleg Yu Vorobyev

Siberian Federal University

Estela Blaisten-Barojas

George Mason University

Boston University

Kansas State University

Kathryn LaFevers Evans, Three Eagles

Pacifica Graduate Institute

Viacheslav Kuleshov

Stockholm University

Alejandro Hidalgo

Universidad De Talca

Universidad Nacional de Rio Negro

Universidade de São Paulo

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Papers by T. Greenshaw

RAL Summer School for Experimental High Energy Physics Students

School for Experimental High Energy Physics Students

New results from the H1 experiment at HERA on jets, the proton structure function, rapidity gap events, charged current cross section and searches for new particles

The cross section of the charged current process e&quot;-p#-&gt;##nu#_e+hadrons is measur... more The cross section of the charged current process e&quot;-p#-&gt;##nu#_e+hadrons is measured at HERA for transverse momenta of the hadron system larger than 25 GeV. The effect of the W propagator term is visible for the first time. A direct search for new particles is presented. No evidence for the production of leptoquarks, leptogluons R-parity violating squarks or excited electrons could be found. New exclusion limits are given. (orig.)SIGLEAvailable from TIB Hannover: RA 2999(94-112) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Linear Collider Flavour Identification (LCFI) Collaboration Outline of Scientific Programme and Funding Request

Since the early ‘90s (startup of SLC and SLD) the possibility of a TeV-scale + −e e linear collid... more

Jets and energy flow in photon-proton collisions at HERA

Zeitschrift für Physik C: Particles and Fields, 1996

The Science Case for 4GLS

This document is presented by over 200 members of the UK Scientific Community and contains the sc... more This document is presented by over 200 members of the UK Scientific Community and contains the scientific case for the establishment of the 4 th Generation Light Source (4GLS) at CLRC Daresbury Laboratory. It forms a part of the proposal to establish a National Centre for Accelerator Science Imaging and Medicine (CASIM) at the laboratory which was first submitted to the North West Science Review Committee in 2000. The proposal for 4GLS will be assessed through the 'Gateway Process', with peer review organised by EPSRC on behalf of OST. The mechanism of this process is described in Appendix I. In line with the stages of this process, the purpose of this document is to present the outline science case only for peer review. The full business case with a complete analysis of costs and risks will be presented at the appropriate stage of the process, following a design study. The UK has had an established and documented need for a low energy SR source for at least 15 years and the initial drive to establish such a source was borne out of the need to provide scientists both in the UK and internationally 1 with access to a world class source of high quality UV -XUV radiation. However, developments in accelerator technology during this period have now allowed us to propose a facility that will realise long-awaited scientific goals in the field of dynamics and nanoscience that far surpass our original expectations. This in turn brings together two previously rather independent communities, the 'low energy SR' community and the 'laser' community, and allows the synergies between SR and laser sources to be exploited to the full, for the first time, in cutting-edge experiments. This document is a proposal to establish the world's leading low energy source. 4GLS is a suite of accelerator-based light sources designed to complement the ESRF and diamond by providing state-of-the-art radiation in the low energy photon regime -from the far-infrared (IR) to the extreme ultraviolet (XUV). At its heart is a low energy ring based on a superconducting energy recovery linac (ERL) which will provide optimised synchrotron radiation from a variety of free electron lasers (IR to XUV), undulators and bending magnets. Contents THE 4GLS VISION .

Photoproduction of mesons at HERA

Physics Letters B, 1994

We present a study of J/psi meson production in collisions of 26.7 GeV electrons with 820 GeV pro... more We present a study of J/psi meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J/psi mesons are detected via their leptonic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of sigma(ep --> J/psiX) = (8.8+/-2.0+/-2.2) nb is determined for 30 GeV <= Wgammap <= 180 GeV and Q2 <~ 4 GeV2. Using the flux of quasi-real photons with Q2 <~ 4 GeV2, a total production cross section of sigma(gammap --> J/psiX) = (56+/-13+/-14) nb is derived at an average Wgammap=90 GeV. The distribution of the squared momentum transfer t from the proton to the J/psi can be fitted using an exponential exp(-b||t||) below a ||t|| of 0.75 GeV2 yielding a slope parameter of b = (4.7+/-1.9) GeV-2. Supported by the Swiss National Science Foundation

A search for heavy leptons at HERA

Physics Letters B, 1994

$Research paper thumbnail of First measurement of the deep-inelastic structure of proton diffraction$

First measurement of the deep-inelastic structure of proton diffraction

Physics Letters B, 1995

A measurement is presented, using data taken with the H1 detector at HERA, of the contribution of... more A measurement is presented, using data taken with the H1 detector at HERA, of the contribution of diractive i n teractions to deep{inelastic electron{proton (ep) scattering in the kinematic range 8:5 < Q 2 < 50 GeV 2 , 2 : 4 10 4 < Bjorken{x < 0 : 0133, and 3:7 10 4 < x I P < 0 : 043. The diractive contribution to the proton structure function F 2 (x; Q 2 ) i s e v aluated as a function of the appropriate deep{inelastic scattering variables x IP , Q 2 , and (= x=x IP ) using a class of deep{inelastic ep scattering events with no hadronic energy ow i n a n i n terval of pseudo{rapidity adjacent t o the proton beam direction. The dependence of this contribution on x IP is measured to be x n IP with n = 1 : 19 0:06(stat:) 0:07(syst:) independent o f and Q 2 , which is consistent with both a diractive i n terpretation and a factorisable ep diractive cross section. A rst measurement of the deep{inelastic structure of the pomeron in the form of the Q 2 and dependences of a factorised structure function is presented. For all measured , this structure function is observed to be consistent with scale invariance.

Observation of hard processes in rapidity gap events in γp interactions at HERA

Nuclear Physics B, 1995

Events with no hadronic energy are observed in photon-proton it GeV. These events are interpretec... more Events with no hadronic energy are observed in photon-proton it GeV. These events are interpretec in photon diffractive dissociation a function of transverse energy, i by a Monte Carlo calculation inc low in a large interval of pseudo-rapidity in the proton direction xactions at an average centre of mass energy (6) of 200 1s photon diffractive dissociation. Evidence for hard scattering demonstrated using inclusive single particle spectra, thrust as d the observation of jet production. The data can be described ding hard photon-pomeron scattering. ' Visitor from Yerevan Phys. Inst., rmenia.

Inclusive parton cross sections in photoproduction and photon structure

Nuclear Physics B, 1995

Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections ar... more Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections are extracted from the data by an unfolding method using leading order parton-jet correlations of a QCD generator. The gluon distribution in the photon is derived in the fractional momentum range 0:04 x 1 at the average factorization scale 75 GeV 2 .

The tracking, calorimeter and muon detectors of the H1 experiment at HERA

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997

Abt, I.; Ahmed, T.; Aid, S.; Andreev, V.; Andrieu, B.; Appuhn, R.-D.; Arnault, C.; Arpagaus, M.; ... more

A combination of an elastic net and a Hopfield net to solve the segment linking problem in the forward tracker of the H1 detector at HERA

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997

Abstract The H1 detector at the electron proton collider HERA at DESY in Hamburg is designed to s... more Abstract The H1 detector at the electron proton collider HERA at DESY in Hamburg is designed to study the products of collisions of 27.5 GeV electrons with 820 GeV protons. One of the features of the detector is the Forward Tracker, designed to accurately measure the tracks of charged particles close to the proton remnant direction. The association of the correct sub-sets of measured coordinates to the tracks becomes complicated by the high density of charged particles passing through this region. This article presents the application of a combination of an elastic net and a Hopfield net to solve a part of this track finding problem. The results are compared with those obtained using the H1 standard software package.

Determination of the strong coupling constant using available experimental data

Chinese Physics C, 2010

The internal structure of the jets produced in neutral current interactions for Q 2 > 125 GeV 2 h... more The internal structure of the jets produced in neutral current interactions for Q 2 > 125 GeV 2 has been studied using the subjet multiplicity with the ZEUS detector at HERA. Jets are identified in the laboratory frame by applying the longitudinally invariant k T -cluster algorithm. Next-to-leading order QCD calculations have been obtained and compared to the data; a good agreement has been observed in the region where hadron-to-parton corrections are small, E T,jet > 25 GeV. In this region, the strong coupling constant is extracted and the resulting value is α s (M Z ) = 0.1185±0.0016 (stat.)

The H1 Detector at HERA H1 Collaboration

Observation of an e+ p---> mu+ X event with high transverse momenta at HERA

Work

... S Masson, Au. T Mavroidis, Au. S J Maxfield, Au. S J McMahon, Au. A Mehta, Au. K Meier, Au. D... more

Charged particle multiplicities in deep inelastic scattering at HERA

Zeitschrift für Physik C: Particles and Fields, 1996

Using the H1 detector at HERA, charged particle multiplicity distributions in deep inelastic e + ... more Using the H1 detector at HERA, charged particle multiplicity distributions in deep inelastic e + p scattering have been measured over a large kinematical region. The evolution with W and Q 2 of the multiplicity distribution and of the multiplicity moments in pseudorapidity domains of varying size is studied in the current fragmentation region of the hadronic centre-of-mass frame. The results are compared with data from fixed target lepton-nucleon interactions, e + e − annihilations and hadron-hadron collisions as well as with expectations from QCD based parton models. Fits to the Negative Binomial and Lognormal distributions are presented.

Planar transformers for column parallel CCD clock drive

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009

The LCFI Collaboration is developing the sensors, readout electronics and mechanical support stru... more The LCFI Collaboration is developing the sensors, readout electronics and mechanical support structures for the Vertex Detector (VXD) of the International Linear Collider (ILC). High-speed readout is needed to ensure that the occupancy due to the pair production background at the ILC is kept below 1% level. In order to satisfy this requirement, Column Parallel CCDs (CPCCDs) and Column Parallel

Hard scattering in γp interactions

Physics Letters B, 1992

... Copyright © 1992 Published by Elsevier Science BV Hard scattering in γp interactions. H1 Coll... more

Experimental investigation of the energy dependence of the strong coupling strength

Physics Letters B, 1988

RAL Summer School for Experimental High Energy Physics Students

School for Experimental High Energy Physics Students

New results from the H1 experiment at HERA on jets, the proton structure function, rapidity gap events, charged current cross section and searches for new particles

The cross section of the charged current process e&quot;-p#-&gt;##nu#_e+hadrons is measur... more The cross section of the charged current process e&quot;-p#-&gt;##nu#_e+hadrons is measured at HERA for transverse momenta of the hadron system larger than 25 GeV. The effect of the W propagator term is visible for the first time. A direct search for new particles is presented. No evidence for the production of leptoquarks, leptogluons R-parity violating squarks or excited electrons could be found. New exclusion limits are given. (orig.)SIGLEAvailable from TIB Hannover: RA 2999(94-112) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Linear Collider Flavour Identification (LCFI) Collaboration Outline of Scientific Programme and Funding Request

Since the early ‘90s (startup of SLC and SLD) the possibility of a TeV-scale + −e e linear collid... more

Jets and energy flow in photon-proton collisions at HERA

Zeitschrift für Physik C: Particles and Fields, 1996

The Science Case for 4GLS

This document is presented by over 200 members of the UK Scientific Community and contains the sc... more This document is presented by over 200 members of the UK Scientific Community and contains the scientific case for the establishment of the 4 th Generation Light Source (4GLS) at CLRC Daresbury Laboratory. It forms a part of the proposal to establish a National Centre for Accelerator Science Imaging and Medicine (CASIM) at the laboratory which was first submitted to the North West Science Review Committee in 2000. The proposal for 4GLS will be assessed through the 'Gateway Process', with peer review organised by EPSRC on behalf of OST. The mechanism of this process is described in Appendix I. In line with the stages of this process, the purpose of this document is to present the outline science case only for peer review. The full business case with a complete analysis of costs and risks will be presented at the appropriate stage of the process, following a design study. The UK has had an established and documented need for a low energy SR source for at least 15 years and the initial drive to establish such a source was borne out of the need to provide scientists both in the UK and internationally 1 with access to a world class source of high quality UV -XUV radiation. However, developments in accelerator technology during this period have now allowed us to propose a facility that will realise long-awaited scientific goals in the field of dynamics and nanoscience that far surpass our original expectations. This in turn brings together two previously rather independent communities, the 'low energy SR' community and the 'laser' community, and allows the synergies between SR and laser sources to be exploited to the full, for the first time, in cutting-edge experiments. This document is a proposal to establish the world's leading low energy source. 4GLS is a suite of accelerator-based light sources designed to complement the ESRF and diamond by providing state-of-the-art radiation in the low energy photon regime -from the far-infrared (IR) to the extreme ultraviolet (XUV). At its heart is a low energy ring based on a superconducting energy recovery linac (ERL) which will provide optimised synchrotron radiation from a variety of free electron lasers (IR to XUV), undulators and bending magnets. Contents THE 4GLS VISION .

Photoproduction of mesons at HERA

Physics Letters B, 1994

We present a study of J/psi meson production in collisions of 26.7 GeV electrons with 820 GeV pro... more We present a study of J/psi meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J/psi mesons are detected via their leptonic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of sigma(ep --> J/psiX) = (8.8+/-2.0+/-2.2) nb is determined for 30 GeV <= Wgammap <= 180 GeV and Q2 <~ 4 GeV2. Using the flux of quasi-real photons with Q2 <~ 4 GeV2, a total production cross section of sigma(gammap --> J/psiX) = (56+/-13+/-14) nb is derived at an average Wgammap=90 GeV. The distribution of the squared momentum transfer t from the proton to the J/psi can be fitted using an exponential exp(-b||t||) below a ||t|| of 0.75 GeV2 yielding a slope parameter of b = (4.7+/-1.9) GeV-2. Supported by the Swiss National Science Foundation

A search for heavy leptons at HERA

Physics Letters B, 1994

$Research paper thumbnail of First measurement of the deep-inelastic structure of proton diffraction$

First measurement of the deep-inelastic structure of proton diffraction

Physics Letters B, 1995

A measurement is presented, using data taken with the H1 detector at HERA, of the contribution of... more A measurement is presented, using data taken with the H1 detector at HERA, of the contribution of diractive i n teractions to deep{inelastic electron{proton (ep) scattering in the kinematic range 8:5 < Q 2 < 50 GeV 2 , 2 : 4 10 4 < Bjorken{x < 0 : 0133, and 3:7 10 4 < x I P < 0 : 043. The diractive contribution to the proton structure function F 2 (x; Q 2 ) i s e v aluated as a function of the appropriate deep{inelastic scattering variables x IP , Q 2 , and (= x=x IP ) using a class of deep{inelastic ep scattering events with no hadronic energy ow i n a n i n terval of pseudo{rapidity adjacent t o the proton beam direction. The dependence of this contribution on x IP is measured to be x n IP with n = 1 : 19 0:06(stat:) 0:07(syst:) independent o f and Q 2 , which is consistent with both a diractive i n terpretation and a factorisable ep diractive cross section. A rst measurement of the deep{inelastic structure of the pomeron in the form of the Q 2 and dependences of a factorised structure function is presented. For all measured , this structure function is observed to be consistent with scale invariance.

Observation of hard processes in rapidity gap events in γp interactions at HERA

Nuclear Physics B, 1995

Events with no hadronic energy are observed in photon-proton it GeV. These events are interpretec... more Events with no hadronic energy are observed in photon-proton it GeV. These events are interpretec in photon diffractive dissociation a function of transverse energy, i by a Monte Carlo calculation inc low in a large interval of pseudo-rapidity in the proton direction xactions at an average centre of mass energy (6) of 200 1s photon diffractive dissociation. Evidence for hard scattering demonstrated using inclusive single particle spectra, thrust as d the observation of jet production. The data can be described ding hard photon-pomeron scattering. ' Visitor from Yerevan Phys. Inst., rmenia.

Inclusive parton cross sections in photoproduction and photon structure

Nuclear Physics B, 1995

Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections ar... more Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections are extracted from the data by an unfolding method using leading order parton-jet correlations of a QCD generator. The gluon distribution in the photon is derived in the fractional momentum range 0:04 x 1 at the average factorization scale 75 GeV 2 .

The tracking, calorimeter and muon detectors of the H1 experiment at HERA

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997

Abt, I.; Ahmed, T.; Aid, S.; Andreev, V.; Andrieu, B.; Appuhn, R.-D.; Arnault, C.; Arpagaus, M.; ... more

A combination of an elastic net and a Hopfield net to solve the segment linking problem in the forward tracker of the H1 detector at HERA

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1997

Abstract The H1 detector at the electron proton collider HERA at DESY in Hamburg is designed to s... more Abstract The H1 detector at the electron proton collider HERA at DESY in Hamburg is designed to study the products of collisions of 27.5 GeV electrons with 820 GeV protons. One of the features of the detector is the Forward Tracker, designed to accurately measure the tracks of charged particles close to the proton remnant direction. The association of the correct sub-sets of measured coordinates to the tracks becomes complicated by the high density of charged particles passing through this region. This article presents the application of a combination of an elastic net and a Hopfield net to solve a part of this track finding problem. The results are compared with those obtained using the H1 standard software package.

Determination of the strong coupling constant using available experimental data

Chinese Physics C, 2010

The internal structure of the jets produced in neutral current interactions for Q 2 > 125 GeV 2 h... more The internal structure of the jets produced in neutral current interactions for Q 2 > 125 GeV 2 has been studied using the subjet multiplicity with the ZEUS detector at HERA. Jets are identified in the laboratory frame by applying the longitudinally invariant k T -cluster algorithm. Next-to-leading order QCD calculations have been obtained and compared to the data; a good agreement has been observed in the region where hadron-to-parton corrections are small, E T,jet > 25 GeV. In this region, the strong coupling constant is extracted and the resulting value is α s (M Z ) = 0.1185±0.0016 (stat.)

The H1 Detector at HERA H1 Collaboration

Observation of an e+ p---> mu+ X event with high transverse momenta at HERA

Work

... S Masson, Au. T Mavroidis, Au. S J Maxfield, Au. S J McMahon, Au. A Mehta, Au. K Meier, Au. D... more

Charged particle multiplicities in deep inelastic scattering at HERA

Zeitschrift für Physik C: Particles and Fields, 1996

Using the H1 detector at HERA, charged particle multiplicity distributions in deep inelastic e + ... more Using the H1 detector at HERA, charged particle multiplicity distributions in deep inelastic e + p scattering have been measured over a large kinematical region. The evolution with W and Q 2 of the multiplicity distribution and of the multiplicity moments in pseudorapidity domains of varying size is studied in the current fragmentation region of the hadronic centre-of-mass frame. The results are compared with data from fixed target lepton-nucleon interactions, e + e − annihilations and hadron-hadron collisions as well as with expectations from QCD based parton models. Fits to the Negative Binomial and Lognormal distributions are presented.

Planar transformers for column parallel CCD clock drive

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009

The LCFI Collaboration is developing the sensors, readout electronics and mechanical support stru... more The LCFI Collaboration is developing the sensors, readout electronics and mechanical support structures for the Vertex Detector (VXD) of the International Linear Collider (ILC). High-speed readout is needed to ensure that the occupancy due to the pair production background at the ILC is kept below 1% level. In order to satisfy this requirement, Column Parallel CCDs (CPCCDs) and Column Parallel

Hard scattering in γp interactions

Physics Letters B, 1992

... Copyright © 1992 Published by Elsevier Science BV Hard scattering in γp interactions. H1 Coll... more

Experimental investigation of the energy dependence of the strong coupling strength

Physics Letters B, 1988