C. Marchand

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

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

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

Measurement of the Cross Section for High-p_T Hadron Production in Scattering of 160 GeV/c Muons off Nucleons

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

The differential cross section for production of charged hadrons with high transverse momenta in scattering of 160\,GeV/ $c$ muons off nucleons at low photon virtualities has been m…

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…

Study of Î£(1385) and Î(1321) hyperon and antihyperon production in deep inelastic muon scattering

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

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

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…

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…

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 $160$ …

Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries

C. Adolph, M. G. Alekseev, V. Yu. Alexakhin +215

The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV posit…

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…

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…

Exclusive rho^0 muoproduction on transversely polarised protons and deuterons

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

The transverse target spin azimuthal asymmetry A_UT in hard exclusive production of rho^0 mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised pr…

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…

physics.acc-ph2025

Interim report for the International Muon Collider Collaboration (IMCC)

C. Accettura, S. Adrian, R. Agarwal +383

The International Muon Collider Collaboration (IMCC) [1] was established in 2020 following the recommendations of the European Strategy for Particle Physics (ESPP) and the implemen…

D* and D Meson Production in Muon Nucleon Interactions at 160 GeV/c

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

The production of D* and D mesons in inelastic scattering of 160 GeV/c muons off a ^6LiD target has been investigated with the COMPASS spectrometer at CERN for 0.003 (GeV/c)^2 < Q^…

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…

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…

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…

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…

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-ex2019

Transverse Extension of Partons in the Proton probed by Deeply Virtual Compton Scattering

R. Akhunzyanov, M. G. Alexeev, G. D. Alexeev +223

We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/ $c$ polarized $I^¼^{+}$ and $I^¼^{-}$ beams of the CERN SPS impinging o…

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…

Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering

C. Adolph, M. G. Alekseev, V. Yu. Alexakhin +212

First measurements of azimuthal asymmetries in hadron-pair production in deep-inelastic scattering of muons on transversely polarised ^6LiD (deuteron) and NH_3 (proton) targets are…

Leading order determination of the gluon polarisation from DIS events with high-p_T hadron pairs

C. Adolph, M. G. Alekseev, V. Yu. Alexakhin +212

We present a determination of the gluon polarisation Delta g/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with a pair of large transverse-momentu…

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…

physics.acc-ph2019

Status of the llrf system for SARAF phase II

L. Zhao, G. Ferrand, F. Gougnaud +3

CEA is committed to the design, construction and commissioning of a Medium Energy Beam Transfer line and a superconducting linac (SCL) for SARAF accelerator in order to accelerate…

Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Collins asymmetries

C. Adolph, M. G. Alekseev, V. Yu. Alexakhin +215

The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV posit…

astro-ph1999

A Measurement of the Coulomb Dissociation of 8B at 254 MeV/nucleon and the 8B Solar Neutrino Flux

N. Iwasa, F. Boue, G. Surowka +29

We have measured the Coulomb dissociation of 8B into 7Be and proton at 254 MeV/nucleon using a large-acceptance focusing spectrometer. The astrophysical S17 factor for the 7Be(p,ga…

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…

nucl-ex2012

Virtual Compton Scattering and the Generalized Polarizabilities of the Proton at Q^2=0.92 and 1.76 GeV^2

H. Fonvieille, G. Laveissiere, N. Degrande +161

Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detai…

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-ex2009

Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS

The COMPASS Collaboration, M. Alekseev, V. Yu. Alexakhin +238

The measurements of the Collins and Sivers asymmetries of identified hadrons produced in deep-inelastic scattering of 160 GeV/c muons on a transversely polarised 6LiD target at COM…

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…

First Measurement of Chiral Dynamics in Ï^- Î³-> Ï^- Ï^- Ï^+

M. G. Alekseev, V. Yu. Alexakhin, Yu. Alexandrov +202

The COMPASS collaboration at CERN has investigated the Ï^- Î³-> Ï^- Ï^- Ï^+ reaction at center-of-momentum energy below five pion masses, sqrt(s) < 5 m(Ï), embedded in the Pri…