504 research outputs found
An integrative genome-wide transcriptome reveals that candesartan is neuroprotective and a candidate therapeutic for Alzheimer’s disease
IPA disease and/or function list for genes altered in glutamate versus glutamate + candesartan groups. (XLSX 67 kb
Study of the hard double-parton scattering contribution to inclusive four-lepton production in pp collisions at s√ = 8 TeV with the ATLAS detector
The inclusive production of four isolated charged leptons in pp collisions is analysed for the presence of hard double-parton scattering, using 20.2 fb−1 of data recorded in the ATLAS detector at the LHC at centre-of-mass energy s√ = 8 TeV. In the four-lepton invariant-mass range of 80<m4ℓ<1000 GeV, an artificial neural network is used to enhance the separation between single- and double-parton scattering based on the kinematics of the four leptons in the final state. An upper limit on the fraction of events originating from double-parton scattering is determined at 95% confidence level to be fDPS=0.042, which results in an estimated lower limit on the effective cross section at 95% confidence level of 1.0 mb.We acknowledge the support of ANPCyT, Argentina; YerPhI, Ar-menia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azer-baijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF and Benoziyo Center, Is-rael; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portu-gal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Fed-eration; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallen-berg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, in-dividual groups and members have received support from BCKDF, Canarie, CRC and Compute Canada, Canada; COST, ERC, ERDF, Hori-zon 2020, and Marie Skłodowska-Curie Actions, European Union; Investissements d’ Avenir Labex and Idex, ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia pro-grammes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; CERCA Programme Generalitat de Catalunya, Spain; The Royal Society and Leverhulme Trust, United Kingdom
Observation of Electroweak Production of a Same-Sign W Boson Pair in Association with Two Jets in pp Collisions at root p =13 TeV with the ATLAS Detector
This Letter presents the observation and measurement of electroweak production of a same-sign W
boson pair in association with two jets using 36.1 fb−1 of proton-proton collision data recorded at a centerof-
mass energy of root s = 13 TeV by the ATLAS detector at the Large Hadron Collider. The analysis is
performed in the detector fiducial phase-space region, defined by the presence of two same-sign leptons,
electron or muon, and at least two jets with a large invariant mass and rapidity difference. A total of 122
candidate events are observed for a background expectation of 69 +/- 7 events, corresponding to an observed
signal significance of 6.5 standard deviations.We acknowledge the support of ANPCyT, Argentina;
YerPhI, Armenia; ARC, Australia; BMWFW and FWF,
Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and
FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN;
CONICYT, Chile; CAS, MOST and NSFC, China;
COLCIENCIAS, Colombia; MSMT CR, MPO CR and
VSC CR, Czech Republic; DNRF and DNSRC, Denmark;
IN2P3-CNRS, CEA-DRF/IRFU, France; SRNSFG,
Georgia; BMBF, HGF, and MPG, Germany; GSRT,
Greece; RGC, Hong Kong SAR, China; ISF, I-CORE
and Benoziyo Center, Israel; INFN, Italy; MEXT and
JSPS, Japan; CNRST, Morocco; NWO, Netherlands;
RCN, Norway; MNiSW and NCN, Poland; FCT,
Portugal; MNE/IFA, Romania; MES of Russia and NRC
KI, Russian Federation; JINR; MESTD, Serbia; MSSR,
Slovakia; ARRS and MIZÅ , Slovenia; DST/NRF, South
Africa; MINECO, Spain; SRCSwedish researchand
Wallenberg Foundation, Sweden; SERI, SNSF and
Cantons of Bern and Geneva, Switzerland; MOST,
Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE
and NSF, United States of America. In addition, individual
groups and members have received support from BCKDF,
the Canada Council, CANARIE, CRC, Compute Canada,
FQRNT, and the Ontario Innovation Trust, Canada;
EPLANET, ERC, ERDF, FP7, Horizon 2020 and Marie
Skłodowska-Curie Actions, European Union; Investissements d’Avenir Labex and Idex, ANR, R´egion
Auvergne and Fondation Partager le Savoir, France; DFG
and AvH Foundation, Germany; Herakleitos, Thales and
Aristeia programmes co-financed by EU-ESF and the
Greek NSRF; BSF, GIF and Minerva, Israel; BRF,
Norway; CERCA Programme Generalitat
de Catalunya, Generalitat Valenciana, Spain; the Royal
Society and Leverhulme Trust, United Kingdom. The
crucial computing support from all WLCG partners is
acknowledged gratefully, in particular from CERN, the
ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF
(Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/
GridKA (Germany), INFN-CNAF (Italy), NL-T1
(Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK)
and BNL (USA), the Tier-2 facilities worldwide and large
non-WLCG resource providers
Prompt and non-prompt J/ψ elliptic flow in Pb+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector
The elliptic flow of prompt and non-prompt J/ψ
was measured in the dimuon decay channel in Pb+Pb collisions
at
√
sNN
= 5.02 TeV with an integrated luminosity
of 0.42 nb−1 with the ATLAS detector at the LHC.
The prompt and non-prompt signals are separated using a
two-dimensional simultaneous fit of the invariant mass and
pseudo-proper decay time of the dimuon system from the
J/ψ decay. The measurement is performed in the kinematic
range of dimuon transverse momentum and rapidity
9 < pT < 30 GeV, |y| < 2, and 0–60% collision centrality.
The elliptic flow coefficient, v2, is evaluated relative to
the event plane and the results are presented as a function of
transverse momentum, rapidity and centrality. It is found that
prompt and non-prompt J/ψ mesons have non-zero elliptic
flow. Prompt J/ψ v2 decreases as a function of pT, while for
non-prompt J/ψ it is, with limited statistical significance,
consistent with a flat behaviour over the studied kinematic
region. There is no observed dependence on rapidity or centrality.We acknowledge
the support of ANPCyT, Argentina; YerPhI, Armenia; ARC,
Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC,
Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada;
CERN; CONICYT, Chile; CAS,MOST and NSFC, China; COLCIENCIAS,
Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic;
DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DRF/IRFU,
France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT,
Greece; RGC, Hong Kong SAR, China; ISF, I-CORE and Benoziyo
Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco;
NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT,
Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian
Federation; JINR;MESTD, Serbia; MSSR, Slovakia; ARRS andMIZÅ ,
Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg
Foundation, Sweden; SERI, SNSF and Cantons of Bern and
Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United
Kingdom; DOE and NSF, United States of America. In addition, individual
groups and members have received support from BCKDF, the
Canada Council, CANARIE, CRC, Compute Canada, FQRNT, and
the Ontario Innovation Trust, Canada; EPLANET, ERC, ERDF, FP7,
Horizon 2020 and Marie Skłodowska-Curie Actions, European Union;
Investissements d’Avenir Labex and Idex, ANR, Région Auvergne and
Fondation Partager le Savoir, France; DFG and AvH Foundation, Germany;
Herakleitos, Thales and Aristeia programmes co-financed by
EU-ESF and the Greek NSRF; BSF, GIF and Minerva, Israel; BRF,
Norway; CERCA Programme Generalitat de Catalunya, Generalitat
Valenciana, Spain; the Royal Society and Leverhulme Trust, United
Kingdom. The crucial computing support from all WLCG partners is
acknowledged gratefully, in particular from CERN, the ATLAS Tier-1
facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden),
CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy),
NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and
BNL (USA), the Tier-2 facilities worldwide and large non-WLCG
resource providers
Measurement of ZZ production in the ℓℓνν final state with the ATLAS detector in pp collisions at s√=13 TeV
This paper presents a measurement of ZZ production with the ATLAS detector at the Large Hadron Collider. The measurement is carried out in the final state with two charged leptons and two neutrinos, using data collected during 2015 and 2016 in pp collisions at s√=13 TeV, corresponding to an integrated luminosity of 36.1 fb−1. The integrated cross-sections in the total and fiducial phase spaces are measured with an uncertainty of 7% and compared with Standard Model predictions, and differential measurements in the fiducial phase space are reported. No significant deviations from the Standard Model predictions are observed, and stringent constraints are placed on anomalous couplings corresponding to neutral triple gauge-boson interactions.We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia;
BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and
FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST
and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR,
Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DRF/IRFU, France;
SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan;
CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT,
Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR;
MESTD, Serbia; MSSR, Slovakia; ARRS and MIZ S, Slovenia; DST/NRF, South Africa;
MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of
Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom;
DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, CRC and Compute Canada, Canada;
COST, ERC, ERDF, Horizon 2020, and Marie Sk lodowska-Curie Actions, European Union;
Investissements d' Avenir Labex and Idex, ANR, France; DFG and AvH Foundation, Germany;
Herakleitos, Thales and Aristeia programmes co- nanced by EU-ESF and the Greek
NSRF, Greece; BSF-NSF and GIF, Israel; CERCA Programme Generalitat de Catalunya,
Spain; The Royal Society and Leverhulme Trust, United Kingdom
Search for resonances in the mass distribution of jet pairs with one or two jets identified as b-jets in proton-proton collisions at root s=13 TeV with the ATLAS detector
A search for new resonances decaying into jets containing b-hadrons in pp collisions with the ATLAS
detector at the LHC is presented in the dijet mass range from 0.57 to 7 TeV. The data set corresponds to an
integrated luminosity of up to 36.1 fb−1 collected in 2015 and 2016 at root s=13 TeV. No evidence of a
significant excess of events above the smooth background shape is found. Upper cross-section limits and
lower limits on the corresponding signal mass parameters for several types of signal hypotheses are
provided at 95% C.L. In addition, 95% C.L. upper limits are set on the cross sections for new processes that
would produce Gaussian-shaped signals in the di-b-jet mass distributions.We acknowledge the support of ANPCyT, Argentina;
YerPhI, Armenia; ARC, Australia; BMWFW and FWF,
Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and
FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN;
CONICYT, Chile; CAS, MOST and NSFC, China;
COLCIENCIAS, Colombia; MSMT CR, MPO CR and
VSC CR, Czech Republic; DNRF and DNSRC, Denmark;
IN2P3-CNRS, CEA-DRF/IRFU, France; SRNSFG,
Georgia; BMBF, HGF, and MPG, Germany; GSRT,
Greece; RGC, Hong Kong SAR, China; ISF, I-CORE
and Benoziyo Center, Israel; INFN, Italy; MEXT and
JSPS, Japan; CNRST, Morocco; NWO, Netherlands;
RCN, Norway; MNiSW and NCN, Poland; FCT,
Portugal; MNE/IFA, Romania; MES of Russia and NRC
KI, Russian Federation; JINR; MESTD, Serbia;
MSSR, Slovakia; ARRS and MIZÅ , Slovenia; DST/NRF,
South Africa; MINECO, Spain; SRC and Wallenberg
Foundation, Sweden; SERI, SNSF and Cantons of Bern
and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey;
STFC, United Kingdom; DOE and NSF, United States of
America. In addition, individual groups and members have
received support from BCKDF, the Canada Council,
CANARIE, CRC, Compute Canada, FQRNT, and the
Ontario Innovation Trust, Canada; EPLANET, ERC,
ERDF, FP7, Horizon 2020 and Marie Skłodowska-Curie
Actions, European Union; Investissements d’Avenir Labex
and Idex, ANR, R´egion Auvergne and Fondation Partager
le Savoir, France; DFG and AvH Foundation, Germany;
Herakleitos, Thales and Aristeia programmes co-financed
by EU-ESF and the Greek NSRF; BSF, GIF and Minerva,
Israel; BRF, Norway; CERCA Programme Generalitat de
Catalunya, Generalitat Valenciana, Spain; the Royal
Society and Leverhulme Trust, United Kingdom
Measurements of top-quark pair single- and double-differential cross-sections in the all-hadronic channel in pp collisions at s√ = 13 TeV using the ATLAS detector
We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRT, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russia Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada, CRC and IVADO, Canada; Beijing Municipal Science & Technology Commission, China; COST, ERC, ERDF, Horizon 2020 and Marie Sklodowska-Curie Actions, European Union; Investissements d'Avenir Labex, Investissements d'Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom.Differential cross-sections are measured for top-quark pair production in the all-hadronic decay mode, using proton-proton collision events collected by the ATLAS experiment in which all six decay jets are separately resolved. Absolute and normalised single- and double-differential cross-sections are measured at particle and parton level as a function of various kinematic variables. Emphasis is placed on well-measured observables in fully reconstructed final states, as well as on the study of correlations between the top-quark pair system and additional jet radiation identified in the event. The study is performed using data from proton-proton collisions at s√ = 13 TeV collected by the ATLAS detector at CERN’s Large Hadron Collider in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb−1. The rapidities of the individual top quarks and of the top-quark pair are well modelled by several independent event generators. Significant mismodelling is observed in the transverse momenta of the leading three jet emissions, while the leading top-quark transverse momentum and top-quark pair transverse momentum are both found to be incompatible with several theoretical predictions.ANPCyTYerPhI, ArmeniaAustralian Research CouncilBMWFW, AustriaAustrian Science Fund (FWF)Azerbaijan National Academy of Sciences (ANAS)SSTC, BelarusNational Council for Scientific and Technological Development (CNPq)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)Natural Sciences and Engineering Research Council of Canada (NSERC)NRC, CanadaCanada Foundation for InnovationCERNANID, ChileChinese Academy of SciencesMinistry of Science and Technology, ChinaNational Natural Science Foundation of China (NSFC)Departamento Administrativo de Ciencia, Tecnologia e Innovacion ColcienciasMinistry of Education, Youth & Sports - Czech Republic
Czech Republic GovernmentDNRF, DenmarkDanish Natural Science Research CouncilCentre National de la Recherche Scientifique (CNRS)CEA-DRF/IRFU, FranceSRNSFG, GeorgiaFederal Ministry of Education & Research (BMBF)HGF, GermanyMax Planck SocietyGreek Ministry of Development-GSRTRGC, ChinaHong Kong SAR, ChinaIsrael Science FoundationBenoziyo Center, IsraelIstituto Nazionale di Fisica Nucleare (INFN)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
Japan Society for the Promotion of ScienceCNRST, MoroccoNetherlands Organization for Scientific Research (NWO)
Netherlands GovernmentRCN, NorwayMinistry of Science and Higher Education, PolandNCN, PolandPortuguese Foundation for Science and TechnologyMNE/IFA, RomaniaMES of Russia, Russia FederationNRC KI, Russia FederationJINRMESTD, SerbiaMSSR, SlovakiaSlovenian Research Agency - SloveniaMIZS, SloveniaDST/NRF, South AfricaSpanish GovernmentSRC, SwedenWallenberg Foundation, SwedenSERI, SwitzerlandSwiss National Science Foundation (SNSF)Canton of Bern, SwitzerlandCanton of Geneva, SwitzerlandMinistry of Science and Technology, TaiwanMinistry of Energy & Natural Resources - TurkeyUK Research & Innovation (UKRI)
Science & Technology Facilities Council (STFC)United States Department of Energy (DOE)National Science Foundation (NSF)BCKDF, CanadaCANARIE, CanadaCompute Canada, CanadaCRC, CanadaIVADO, CanadaBeijing Municipal Science & Technology CommissionCOST, European UnionEuropean Union (EU)
European Research Council (ERC)Horizon 2020, European UnionFrench National Research Agency (ANR)German Research Foundation (DFG)Alexander von Humboldt FoundationHerakleitos programme - EU-ESFThales programme - EU-ESFAristeia programme - EU-ESFGreek NSRF, GreeceBSF-NSF, IsraelGerman-Israeli Foundation for Scientific Research and DevelopmentLa Caixa Banking Foundation, SpainCERCA Programme Generalitat de Catalunya, SpainPROMETEO Programme Generalitat Valenciana, SpainGenT Programme Generalitat Valenciana, SpainGoran Gustafssons Stiftelse, SwedenRoyal Society of LondonLeverhulme Trus
Searches for scalar leptoquarks and differential cross-section measurements in dilepton-dijet events in proton-proton collisions at a centre-of-mass energy of s√ = 13 TeV with the ATLAS experiment
Searches for scalar leptoquarks pair-produced in proton-proton collisions at s√=13 TeV at the Large Hadron Collider are performed by the ATLAS experiment. A data set corresponding to an integrated luminosity of 36.1 fb−1 is used. Final states containing two electrons or two muons and two or more jets are studied, as are states with one electron or muon, missing transverse momentum and two or more jets. No statistically significant excess above the Standard Model expectation is observed. The observed and expected lower limits on the leptoquark mass at 95% confidence level extend up to 1.29 TeV and 1.23 TeV for first- and second-generation leptoquarks, respectively, as postulated in the minimal Buchmüller-Rückl-Wyler model, assuming a branching ratio into a charged lepton and a quark of 50%. In addition, measurements of particle-level fiducial and differential cross sections are presented for the Z→ee, Z→μμ and tt¯ processes in several regions related to the search control regions. Predictions from a range of generators are compared with the measurements, and good agreement is seen for many of the observables. However, the predictions for the Z→ℓℓ measurements in observables sensitive to jet energies disagree with the data.We acknowledge
the support of ANPCyT, Argentina; YerPhI, Armenia; ARC,
Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC,
Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada;
CERN; CONICYT, Chile; CAS,MOST and NSFC, China; COLCIENCIAS,
Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic;
DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DRF/IRFU,
France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT,
Greece; RGC, Hong Kong SAR, China; ISF and Benoziyo Center,
Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO,
Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal;
MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation;
JINR;MESTD, Serbia; MSSR, Slovakia; ARRS andMIZÅ , Slovenia;
DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg
Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva,
Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom;
DOE and NSF, United States of America. In addition, individual groups
and members have received support from BCKDF, CANARIE, CRC
and Compute Canada, Canada; COST, ERC, ERDF, Horizon 2020, and
Marie Skłodowska-Curie Actions, European Union; Investissements d’
Avenir Labex and Idex, ANR, France; DFG and AvH Foundation, Germany;
Herakleitos,Thales and Aristeia programmes co-financed by EUESF
and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; CERCA
Programme Generalitat de Catalunya, Spain; The Royal Society and
Leverhulme Trust, United Kingdom
Measurement of the W-boson mass in pp collisions at √ s = 7 TeV with the ATLAS detector
A measurement of the mass of the W boson is presented based on proton–proton collision data recorded in 2011 at a centre-of-mass energy of 7 TeV with the ATLAS detector at the LHC, and corresponding to 4.6 fb−1 of integrated luminosity. The selected data sample consists of 7.8×106 candidates in the W→μν channel and 5.9×106 candidates in the W→eν channel. The W-boson mass is obtained from template fits to the reconstructed distributions of the charged lepton transverse momentum and of the W boson transverse mass in the electron and muon decay channels, yielding
mW=80370=80370±7 (stat.)±11(exp. syst.)±14 (mod. syst.) MeV±19MeV,
where the first uncertainty is statistical, the second corresponds to the experimental systematic uncertainty, and the third to the physics-modelling systematic uncertainty. A measurement of the mass difference between the W+ and W− bosons yields mW+−mW−=−29±28 MeV.We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC,
Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC,
Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada;
CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DSM/IRFU,
France; SRNSF, Georgia; BMBF, HGF, and MPG, Germany; GSRT,
Greece; RGC, Hong Kong SAR, China; ISF, I-CORE and Benoziyo
Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco;
NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT,
Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian
Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZÅ ,
Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and
Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United
Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, the
Canada Council, CANARIE, CRC, Compute Canada, FQRNT, and
the Ontario Innovation Trust, Canada; EPLANET, ERC, ERDF, FP7,
Horizon 2020 and Marie Skłodowska-Curie Actions, European Union;
Investissements d’Avenir Labex and Idex, ANR, Région Auvergne and
Fondation Partager le Savoir, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by
EU-ESF and the Greek NSRF; BSF, GIF and Minerva, Israel; BRF,
Norway; CERCA Programme Generalitat de Catalunya, Generalitat
Valenciana, Spain; the Royal Society and Leverhulme Trust, United
Kingdom. The crucial computing support from all WLCG partners is
acknowledged gratefully, in particular from CERN, the ATLAS Tier-1
facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden),
CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy),
NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and
BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers
Measurement of τ polarisation in Z/γ ∗ → ττ decays in proton–proton collisions at √ s = 8 TeV with the ATLAS detector
This paper presents a measurement of the polarisation
of τ leptons produced in Z/γ
∗ → ττ decays which
i√s performed with a dataset of proton—proton collisions at
s = 8 TeV, corresponding to an integrated luminosity of
20.2 fb−1 recorded with the ATLAS detector at the LHC
in 2012. The Z/γ
∗ → ττ decays are reconstructed from a
hadronically decaying Ï„ lepton with a single charged particle
in the final state, accompanied by a Ï„ lepton that decays
leptonically. The Ï„ polarisation is inferred from the relative
fraction of energy carried by charged and neutral hadrons in
the hadronic Ï„ decays. The polarisation is measured in a fiducial
region that corresponds to the kinematic region accessible
to this analysis. The Ï„ polarisation extracted over the full
phase space within the Z/γ
∗ mass range of 66 < mZ/γ
∗ <
116GeVis found to be Pτ = −0.14±0.02(stat)±0.04(syst).
It is in agreement with the Standard Model prediction of
Pτ = −0.1517 ± 0.0019, which is obtained from the ALPGEN
event generator interfaced with the PYTHIA 6 parton
shower modelling and the TAUOLA Ï„ decay library.MINECO, Spain; EPLANET, ERC, ERDF, FP7,
Horizon 2020 and Marie Skłodowska-Curie Actions, European Unio
- …