Search results for: C. Quintans

Items from 1 to 20 out of 107 results

article

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

C. Adolph, M. Aghasyan, R. Akhunzyanov, M. G. Alexeev, more

The European Physical Journal C > 2018 > 78 > 11 > 1-13

Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined using the 2006 COMPASS data and also combined all deuteron COMPASS data. For each hadron charge, the dependence of the azimuthal asymmetry on the hadron azimuthal angle $$\phi $$ ϕ is obtained by means of a five-parameter...

article

Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, more

Physics Letters B > 2018 > 783 > C > 334-340

We have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π−)π±N′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ+π− mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X(3872). The shape of the π+π− mass distribution from the observed decay...

article

First measurement of the Sivers asymmetry for gluons using SIDIS data

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, more

Physics Letters B > 2017 > 772 > C > 854-864

The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers...

article

Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, more

Physics Letters B > 2017 > 770 > C > 138-145

Eight proton transverse-spin-dependent azimuthal asymmetries are extracted in four regions of the photon virtuality Q2 from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon–nucleon scattering. These Q2 regions correspond to the four regions of the di-muon mass Q2 used in the ongoing analyses of the COMPASS Drell–Yan measurements, which allows for a future direct comparison...

article

Final COMPASS results on the deuteron spin-dependent structure function g1d and the Bjorken sum rule

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, more

Physics Letters B > 2017 > 769 > C > 34-41

Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a ⁶LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1(GeV/c)2<Q2<100(GeV/c)2 in photon virtuality, 0.004<x<0.7 in the Bjorken scaling variable and W>4GeV/c2 in the mass of the hadronic...

article

Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, more

Physics Letters B > 2017 > 767 > C > 133-141

Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y, and the fraction z of the virtual-photon energy carried by the produced hadron. The data were obtained by the COMPASS Collaboration by scattering 160 GeV muons off an isoscalar ⁶...

article

Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data

C. Adolph, M. Aghasyan, R. Akhunzyanov, M. G. Alexeev, more

The European Physical Journal C > 2017 > 77 > 4 > 1-12

Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality $$Q^2>1~(\mathrm{GeV}/c)^2$$ Q 2 > 1 ( GeV / c ) 2 . The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam...

article

Exclusive ω meson muoproduction on transversely polarised protons

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, more

Nuclear Physics B > 2017 > 915 > C > 454-475

Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)2<Q2<10 (GeV/c)2, Bjorken scaling variable 0.003<xBj<0.3 and transverse momentum squared of the ω meson 0.05 (GeV/c)2<pT2<0.5 (GeV/c)2...

article

Multiplicities of charged pions and charged hadrons from deep-inelastic scattering of muons off an isoscalar target

C. Adolph, M. Aghasyan, R. Akhunzyanov, G.D. Alexeev, more

Physics Letters B > 2017 > 764 > C > 1-10

Multiplicities of charged pions and charged hadrons produced in deep-inelastic scattering were measured in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y and the relative hadron energy z. Data were obtained by the COMPASS Collaboration using a 160GeV muon beam and an isoscalar target (⁶LiD). They cover the kinematic domain in the photon virtuality Q2>1(GeV/c)2,...

article

Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, more

Physics Letters B > 2016 > 753 > C > 573-579

We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q2<1(GeV/c)2 for transverse hadron momenta pT in the range 1 GeV/c to 4 GeV/c. They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/c or 200 GeV/c impinging on polarised ⁶LiD or NH₃ targets. The experimental asymmetries are compared...

article

Interplay among transversity induced asymmetries in hadron leptoproduction

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, more

Physics Letters B > 2016 > 753 > C > 406-411

In the fragmentation of a transversely polarized quark several left–right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as the Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep...

article

The spin structure function g1p of the proton and a test of the Bjorken sum rule

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, more

Physics Letters B > 2016 > 753 > C > 18-28

New results for the double spin asymmetry A1p and the proton longitudinal spin structure function g1p are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH₃ target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of x. They improve the statistical precision...

article

Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, more

Physics Letters B > 2015 > 744 > Complete > 250-259

Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero...

article

The COMPASS setup for physics with hadron beams

P. Abbon, C. Adolph, R. Akhunzyanov, Yu. Alexandrov, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2015 > 779 > C > 69-115

The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This setup was designed to perform exclusive measurements of processes with several charged and/or neutral particles in the final state. Making use of a large part of the apparatus that was previously built for spin structure studies with a muon beam, it also features a new target system as well...

article

Search for exclusive photoproduction of Zc±(3900) at COMPASS

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, more

Physics Letters B > 2015 > 742 > C > 330-334

A search for the exclusive production of the Zc±(3900) hadron by virtual photons has been performed in the channel Zc±(3900)→J/ψπ±. The data cover the range from 7 GeV to 19 GeV in the centre-of-mass energy of the photon–nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio BR(Zc±(3900)→J/ψπ±)×σγN→Zc±(3900)N/σγN→J/ψN...

article

Odd and even partial waves of ηπ− and η′π− in π−p→η(′)π−p at 191 GeV/c

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, more

Physics Letters B > 2015 > 740 > Complete > 303-311

Exclusive production of ηπ^- and η^'π^- has been studied with a 191 GeV/cπ^- beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c². A striking similarity between the two systems is observed for the L=2,4,6 intensities (scaled by kinematical factors) and the relative...

article

Erratum to: Hadron transverse momentum distributions in muon deep inelastic scattering at 160 GeV/ $$c$$ c

C. Adolph, M. G. Alekseev, V. Yu. Alexakhin, Yu. Alexandrov, more

The European Physical Journal C > 2015 > 75 > 2 > 1-3

article

A high-statistics measurement of transverse spin effects in dihadron production from muon–proton semi-inclusive deep-inelastic scattering

C. Adolph, R. Akhunzyanov, M.G. Alekseev, Yu. Alexandrov, more

Physics Letters B > 2014 > 736 > C > 124-131

A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH₃) targets is presented. They provide independent access to the transversity distribution functions through the measurement of the Collins asymmetry in single hadron production. The data were taken in the year 2010 with the COMPASS spectrometer using a 160 GeV/c...

article

Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

C. Adolph, R. Akhunzyanov, M.G. Alexeev, Yu. Alexandrov, more

Nuclear Physics, Section B > 2014 > 886 > Complete > 1046-1077

Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS longitudinally polarised muon beam at 160 GeV/c and a ⁶ LiD target. The amplitudes of the three azimuthal modulations cos⁡ϕh, cos⁡2ϕh and sin⁡ϕh were obtained binning the data separately in each of the relevant kinematic variables...

article

Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, more

Nuclear Physics, Section B > 2014 > 886 > Complete > 1078-1101

Exclusive production of the isoscalar vector mesons ω and ϕ is measured with a 190 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable xF of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xF and on the invariant mass MpV of the system formed...

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Search results for: C. Quintans

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

First measurement of the Sivers asymmetry for gluons using SIDIS data

Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS

Final COMPASS results on the deuteron spin-dependent structure function g1d and the Bjorken sum rule

Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target

Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data

Exclusive ω meson muoproduction on transversely polarised protons

Multiplicities of charged pions and charged hadrons from deep-inelastic scattering of muons off an isoscalar target

Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT

Interplay among transversity induced asymmetries in hadron leptoproduction

The spin structure function g1p of the proton and a test of the Bjorken sum rule

Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons

The COMPASS setup for physics with hadron beams

Search for exclusive photoproduction of Zc±(3900) at COMPASS

Odd and even partial waves of ηπ− and η′π− in π−p→η(′)π−p at 191 GeV/c

Erratum to: Hadron transverse momentum distributions in muon deep inelastic scattering at 160 GeV/ $$c$$ c

A high-statistics measurement of transverse spin effects in dihadron production from muon–proton semi-inclusive deep-inelastic scattering

Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions

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