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Publications (26)

nucl-ex2017

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

T. Ishikawa, H. Fujimura, H. Fukasawa +33

The total cross sections were measured for coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV for the first time. No clear resonance-li…

hep-ex2014

Spin alignment and violation of the OZI rule in exclusive $I ¨ $ and $I ¨ $ production in pp collisions

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

Exclusive production of the isoscalar vector mesons $I ¨ $ and $I ¨ $ is measured with a 190 GeV $/ c$ proton beam impinging on a liquid hydrogen target. Cross section ratios are determi…

physics.ins-det2014

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

Measurement of radiative widths of $a_{2} (1320)$ and $I ¨ _{2} (1670)$

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

The COMPASS Collaboration at CERN has investigated the reaction $I ¨ ^{-} I^^{3} \to I ¨ ^{-} I ¨ ^{-} I ¨ ^{+}$ embedded in the Primakoff reaction of $190 GeV$ pions scattering in the C…

hep-ex2015

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-ex2016

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 $I ¨ ^{-} I ¨ ^{-} I ¨ ^{+}$ final state using a stationary hydrogen target. A partial-wave…

nucl-ex2016

An event mixing technique for Bose-Einstein correlations of two pions in photoproduction around 1 GeV

Qing-Hua He, H. Fujimura, H. Fukasawa +32

We have developed an event mixing technique to observe Bose-Einstein correlations (BEC) between two identical neutral pions produced in photo-induced reactions in the non-perturbat…

nucl-ex2018

Non-strange Dibaryon Resonances Observed in the $I^^{3} d \to I ¨ ^{0} I ¨ ^{0} d$ Reaction

T. Ishikawa, H. Fujimura, H. Fukasawa +34

Coherent double neutral-pion photoproduction on the deuteron, $I^^{3} d$ { $\to$ } $I ¨ ^{0} I ¨ ^{0} d$ , has been experimentally studied at incident photon energies ranging from 0.75 to 1.15 GeV…

nucl-ex2022

Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV

T. Ishikawa, A. Fix, H. Fujimura +35

Coherent photoproduction of the neutral pion and eta meson on the deuteron, $I^^{3} d$ { $\to$ } $I ¨ ^{0} I^\cdot d$ , has been experimentally studied at incident photon energies ranging from the…

hep-ex2016

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-ex2017

Exclusive $I ¨ $ meson muoproduction on transversely polarised protons

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

Exclusive production of $I ¨ $ mesons was studied at the COMPASS experiment by scattering $160 GeV / c$ muons off transversely polarised protons. Five single-spin and…

cond-mat.str-el2005

Robust Ti4+ states in SrTiO3 layers of La0.6Sr0.4MnO3/SrTiO3/ La0.6Sr0.4MnO3 junctions

H. Kumigashira, A. Chikamatsu, R. Hashimoto +8

We have investigated the interfacial electronic structure of La0.6Sr0.4MnO3 (LSMO)/ SrTiO3 (STO)/ LSMO heterojunctions utilizing the elemental selectivity of photoemission spectros…

cond-mat.str-el2006

Effect of strong localization of doped holes in angle-resolved photoemission spectra of La $_{1 - x}$ Sr $_{x}$ FeO $_{3}$

H. Wadati, A. Chikamatsu, M. Takizawa +9

We have performed an angle-resolved photoemission spectroscopy study of La $_{0.6}$ Sr $_{0.4}$ FeO $_{3}$ using {\it in situ} prepared thin films and determined its band structure. The e…

hep-ex2015

Measurement of the charged-pion polarisability

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

The COMPASS collaboration at CERN has investigated pion Compton scattering, $I ¨ ^{-} I^^{3} \to I ¨ ^{-} I^^{3}$ , at centre-of-mass energy below 3.5 pion masses. The process is embedded in t…

hep-ex2015

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-ex2014

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

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 $Z_{c}^{\pm} (3900) \to J / I ¨ I ¨ ^{\pm}$ . The data cover…

hep-ex2014

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 $160$ …

nucl-ex2019

$I ¨ N$ scattering length from $I ¨ $ photoproduction on the proton near the threshold

T. Ishikawa, H. Fujimura, H. Fukasawa +35

Photoproduction of the $I ¨ $ meson on the proton has been experimentally studied near the threshold. The total cross sections are determined at incident energies ranging from 1.09 t…

nucl-ex2021

Resonance-like structure near the $I^\cdot d$ threshold in the $I^^{3} d$ { $\to$ } $I ¨ ^{0} I^\cdot d$ reaction

T. Ishikawa, H. Fujimura, H. Fukasawa +34

To investigate the interaction between the nucleon $N$ and nucleon resonance $N (1535) 1/ 2^{-}$ , the $I^\cdot d$ threshold structure connected to the isoscalar $S$ -wave $N$ - $N (1535) 1/ 2^{-}$ sy…

hep-ex2014

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-ex2017

Resonance Production and $I ¨ I ¨ $ S-wave in $I ¨ ^{-} + p \to I ¨ ^{-} I ¨ ^{-} I ¨ ^{+} + p_{r eco i l}$ 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 $I ¨ ^{-} I ¨ ^{-} I ¨ ^{+}$ final states using a negative pion beam of 190 GeV/c momentum imping…

hep-ex2015

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…

cond-mat.str-el2004

Temperature-dependent soft x-ray photoemission and absorption studies of charge disproportionation in La $_{1 - x}$ Sr $_{x}$ FeO $_{3}$

H. Wadati, A. Chikamatsu, R. Hashimoto +7

We have measured the temperature dependence of the photoemission and x-ray absorption spectra of La $_{1 - x}$ Sr $_{x}$ FeO $_{3}$ (LSFO) epitaxial thin films with $x = 0.67$ , where charge dis…

hep-ex2014

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

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

Exclusive production of $I^\cdot I ¨ ^{-}$ and $I^\cdot^{'} I ¨ ^{-}$ has been studied with a $191 GeV / c$ $I ¨ ^{-}$ beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses rev…

hep-ex2017

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

C. Adolph, M. Aghasyan, R. Akhunzyanov +217

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…

Publications (26)

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

Spin alignment and violation of the OZI rule in exclusive I¨ and I¨ production in pp collisions

The COMPASS Setup for Physics with Hadron Beams

Measurement of radiative widths of a2​(1320) and I¨2​(1670)

Interplay among transversity induced asymmetries in hadron leptoproduction

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

An event mixing technique for Bose-Einstein correlations of two pions in photoproduction around 1 GeV

Non-strange Dibaryon Resonances Observed in the I^3d→I¨0I¨0d Reaction

Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV

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

Exclusive I¨ meson muoproduction on transversely polarised protons

Robust Ti4+ states in SrTiO3 layers of La0.6Sr0.4MnO3/SrTiO3/ La0.6Sr0.4MnO3 junctions

Effect of strong localization of doped holes in angle-resolved photoemission spectra of La1−x​Srx​FeO3​

Measurement of the charged-pion polarisability

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

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

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

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

I¨N scattering length from I¨ photoproduction on the proton near the threshold

Resonance-like structure near the I^⋅d threshold in the I^3d{→}I¨0I^⋅d reaction

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

Resonance Production and I¨I¨ S-wave in I¨−+p→I¨−I¨−I¨++precoil​ at 190 GeV/c

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

Temperature-dependent soft x-ray photoemission and absorption studies of charge disproportionation in La1−x​Srx​FeO3​

Odd and Even Partial Waves of I^⋅I¨− and I^⋅′I¨− in I¨−p→I^⋅(′)I¨−p at 191GeV/c

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

Spin alignment and violation of the OZI rule in exclusive $I ¨ $ and $I ¨ $ production in pp collisions

Measurement of radiative widths of $a_{2} (1320)$ and $I ¨ _{2} (1670)$

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

Non-strange Dibaryon Resonances Observed in the $I^^{3} d \to I ¨ ^{0} I ¨ ^{0} d$ Reaction

Exclusive $I ¨ $ meson muoproduction on transversely polarised protons

Effect of strong localization of doped holes in angle-resolved photoemission spectra of La $_{1 - x}$ Sr $_{x}$ FeO $_{3}$

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

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

$I ¨ N$ scattering length from $I ¨ $ photoproduction on the proton near the threshold

Resonance-like structure near the $I^\cdot d$ threshold in the $I^^{3} d$ { $\to$ } $I ¨ ^{0} I^\cdot d$ reaction

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

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

Temperature-dependent soft x-ray photoemission and absorption studies of charge disproportionation in La $_{1 - x}$ Sr $_{x}$ FeO $_{3}$

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