S. Schopferer

activity

20102020

most citedThe Spin-dependent Structure Function of the Proton g_1^p and a Test of the Bjorken Sum Rule

174 citations · 2k across the 37 of their papers we have counts for

collaborators

37 papers

physics.ins-det2020★ 3 cited

MPGD-based photon detectors for the upgrade of COMPASS RICH-1 and beyond

J. Agarwala, M. Alexeev, C. D. R. Azevedo +28

COMPASS is a fixed target experiment at CERN SPS aimed to study hadron structure and spectroscopy. Hadron identification in the momentum range between $3$ and $55 G e V / c$ is provide…

physics.ins-det2019

The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1

J. Agarwala, M. Alexeev, C. D. R. Azevedo +25

After pioneering gaseous detectors of single photon for RICH applications using CsI solid state photocathodes in MWPCs within the RD26 collaboration and by the constructions for th…

physics.ins-det2018★ 23 cited

The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1 and beyond

J. Agarwala, M. Alexeev, C. D. R. Azevedo +25

After pioneering gaseous detectors of single photon for RICH applications using CsI solid state photocathodes in MWPCs within the RD26 collaboration and by the constructions for th…

physics.ins-det2017★ 1 cited

Status of COMPASS RICH-1 Upgrade with MPGD-based Photon Detectors

M. Alexeev, R Birsa, F. Bradamante +31

A Set of new MPGD-based Photon Detectors is being built for the upgrade of COMPASS RICH-1. The detectors cover a total active area of 1.4 m $^{2}$ and are based on a hybrid architectu…

hep-ex2016★ 12 cited

Exclusive $ω$ meson muoproduction on transversely polarised protons

C. Adolph, J. Agarwala, M. Aghasyan +225

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…

hep-ex2016★ 52 cited

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

C. Adolph, J. Agarwala, M. Aghasyan +224

Multiplicities of charged pions and unidentified hadrons produced in deep-inelastic scattering were measured in bins of the Bjorken scaling variable $x$ , the relative virtual-photo…

hep-ex2015★ 3 cited

Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_{T}$

COMPASS Collaboration, C. Adolph, R. Akhunzyanov +207

We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^{2}$ < 1(GeV/ $c$ ) $^{2}$ for transve…

hep-ex2015★ 57 cited

Resonance Production and $π π$ S-wave in $π^{-} + p \to π^{-} π^{-} π^{+} + p_{r eco i l}$ at 190 GeV/c

C. Adolph, R. Akhunzyanov, M. G. Alexeev +206

The COMPASS collaboration has collected the currently largest data set on diffractively produced $π^{-} π^{-} π^{+}$ final states using a negative pion beam of 190 GeV/c momentum impinging…

hep-ex2015★ 14 cited

Interplay among transversity induced asymmetries in hadron leptoproduction

Compass Collaboration, C. Adolph, R. Akhunzyanov +206

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 exhi…

hep-ex2015★ 127 cited

The Spin Structure Function $g_{1}^{p}$ of the Proton and a Test of the Bjorken Sum Rule

C. Adolph, R. Akhunzyanov, M. G. Alexeev +203

New results for the double spin asymmetry $A_{1}^{p}$ and the proton longitudinal spin structure function $g_{1}^{p}$ are presented. They were obtained by the COMPASS collabora…

hep-ex2015★ 75 cited

Observation of a new narrow axial-vector meson $a_{1} (1420)$

C. Adolph, R. Akhunzyanov, M. G. Alexeev +201

The COMPASS collaboration at CERN has measured diffractive dissociation of 190 GeV/ $c$ pions into the $π^{-} π^{-} π^{+}$ final state using a stationary hydrogen target. A partial-wave ana…

physics.ins-det2014★ 78 cited

The COMPASS Setup for Physics with Hadron Beams

Ph. Abbon, C. Adolph, R. Akhunzyanov +228

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…

hep-ex2014★ 114 cited

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

C. Adolph, R. Akhunzyanov, M. G. Alexeev +205

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 tra…

hep-ex2014★ 77 cited

Odd and Even Partial Waves of $η π^{-}$ and $η^{'} π^{-}$ in $π^{-} p \to η^{(')} π^{-} p$ at $191 GeV / c$

C. Adolph, R. Akhunzyanov, M. G. Alexeev +205

Exclusive production of $η π^{-}$ and $η^{'} π^{-}$ has been studied with a $191 GeV / c$ $π^{-}$ beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal d…

hep-ex2014★ 35 cited

Search for exclusive photoproduction of Z $_{c}^{\pm}$ (3900) at COMPASS

C. Adolph, R. Akhunzyanov, M. G. Alexeev +205

A search for the exclusive production of the $Z_{c}^{\pm} (3900)$ hadron by virtual photons has been performed in the channel $Z_{c}^{\pm} (3900) \to J / ψ π^{\pm}$ . The data cover t…

hep-ex2014★ 7 cited

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

C. Adolph, R. Akhunzyanov, M. G. Alexeev +206

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 determine…

hep-ex2014★ 52 cited

Measurement of the charged-pion polarisability

C. Adolph, R. Akhunzyanov, M. G. Alexeev +210

The COMPASS collaboration at CERN has investigated pion Compton scattering, $π^{-} γ \to π^{-} γ$ , at centre-of-mass energy below 3.5 pion masses. The process is embedded in the r…

hep-ex2014★ 15 cited

Measurement of radiative widths of $a_{2} (1320)$ and $π_{2} (1670)$

C. Adolph, R. Akhunzyanov, M. G. Alekseev +206

The COMPASS Collaboration at CERN has investigated the reaction $π^{-} γ \to π^{-} π^{-} π^{+}$ embedded in the Primakoff reaction of $190 GeV$ pions scattering in the Coulom…

hep-ex2014★ 78 cited

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 +217

A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH $_{3}$ ) targets are presented. They provid…

hep-ex2014★ 74 cited

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

C. Adolph, R. Akhunzyanov, M. G. Alekseev +217

Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS muon beam at $160$ …

hep-ex2013★ 29 cited

Transverse target spin asymmetries in exclusive $ρ^{0}$ muoproduction

C. Adolph, M. G. Alekseev, V. Yu. Alexakhin +209

Exclusive production of $ρ^{0}$ mesons was studied at the COMPASS experiment by scattering 160 GeV/ $c$ muons off transversely polarised protons. Five single-spin and three double-spi…

hep-ex2013★ 68 cited

Hadron Transverse Momentum Distributions in Muon Deep Inelastic Scattering at 160 GeV/ $c$

C. Adolph, M. G. Alekseev, V. Yu. Alexakhin +207

Multiplicities of charged hadrons produced in deep inelastic muon scattering off a $^{6}$ LiD target have been measured as a function of the DIS variables $x_{B j}$ , $Q^{2}$ , $W^{2}$ and t…

hep-ex2013★ 10 cited

Study of Σ(1385) and Ξ(1321) hyperon and antihyperon production in deep inelastic muon scattering

C. Adolph, M. Alekseev, V. Yu. Alexakhin +203

Large samples of Λ, Σ(1385) and Ξ(1321) hyperons produced in deep-inelastic muon scattering off a ^6LiD target were collected with the COMPASS experimental setup at CERN. The relat…

hep-ex2012★ 69 cited

Leading and Next-to-Leading Order Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction

C. Adolph, M. G. Alekseev, V. Yu. Alexakhin +217

The gluon polarisation in the nucleon was measured using open charm production by scattering 160 GeV/c polarised muons off longitudinally polarised protons or deuterons. The data w…

MPGD-based photon detectors for the upgrade of COMPASS RICH-1 and beyond

The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1

The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1 and beyond

Status of COMPASS RICH-1 Upgrade with MPGD-based Photon Detectors

Exclusive ω meson muoproduction on transversely polarised protons

Multiplicities of charged pions and unidentified 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​

Resonance Production and ππ S-wave in π−+p→π−π−π++precoil​ at 190 GeV/c

Interplay among transversity induced asymmetries in hadron leptoproduction

The Spin Structure Function g1p​ of the Proton and a Test of the Bjorken Sum Rule

Observation of a new narrow axial-vector meson a1​(1420)

The COMPASS Setup for Physics with Hadron Beams

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

Odd and Even Partial Waves of ηπ− and η′π− in π−p→η(′)π−p at 191GeV/c

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

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

Measurement of the charged-pion polarisability

Measurement of radiative widths of a2​(1320) and π2​(1670)

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

Transverse target spin asymmetries in exclusive ρ0 muoproduction

Hadron Transverse Momentum Distributions in Muon Deep Inelastic Scattering at 160 GeV/c

Study of Σ(1385) and Ξ(1321) hyperon and antihyperon production in deep inelastic muon scattering

Leading and Next-to-Leading Order Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction

Exclusive $ω$ meson muoproduction on transversely polarised protons

Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_{T}$

Resonance Production and $π π$ S-wave in $π^{-} + p \to π^{-} π^{-} π^{+} + p_{r eco i l}$ at 190 GeV/c

The Spin Structure Function $g_{1}^{p}$ of the Proton and a Test of the Bjorken Sum Rule

Observation of a new narrow axial-vector meson $a_{1} (1420)$

Odd and Even Partial Waves of $η π^{-}$ and $η^{'} π^{-}$ in $π^{-} p \to η^{(')} π^{-} p$ at $191 GeV / c$

Search for exclusive photoproduction of Z $_{c}^{\pm}$ (3900) at COMPASS

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

Measurement of radiative widths of $a_{2} (1320)$ and $π_{2} (1670)$

Transverse target spin asymmetries in exclusive $ρ^{0}$ muoproduction

Hadron Transverse Momentum Distributions in Muon Deep Inelastic Scattering at 160 GeV/ $c$