Related papers: Recent Physics results with the COMPASS Experiment

Azimuthal distributions of charged hadrons, pions, and kaons produced in deep-inelastic scattering off unpolarized protons and deuterons

The azimuthal cos{\phi} and cos2{\phi} modulations of the distribution of hadrons produced in unpolarized semi-inclusive deep-inelastic scattering of electrons and positrons off hydrogen and deuterium targets have been measured in the…

High Energy Physics - Experiment · Physics 2015-03-20 HERMES Collaboration , A. Airapetian , N. Akopov , Z. Akopov , E. C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , E. Avetisyan , S. Belostotski , H. P. Blok , A. Borissov , J. Bowles , V. Bryzgalov , J. Burns , M. Capiluppi , G. P. Capitani , G. Ciullo , M. Contalbrigo , P. F. Dalpiaz , W. Deconinck , R. De Leo , L. De Nardo , E. De Sanctis , M. Diefenthaler , P. Di Nezza , M. Düren , G. Elbakian , F. Ellinghaus , A. Fantoni , L. Felawka , S. Frullani , G. Gapienko , V. Gapienko , F. Garibaldi , G. Gavrilov , V. Gharibyan , F. Giordano , S. Gliske , M. Golembiovskaya , C. Hadjidakis , M. Hartig , D. Hasch , A. Hillenbrand , M. Hoek , Y. Holler , I. Hristova , Y. Imazu , A. Ivanilov , H. E. Jackson , H. S. Jo , S. Joosten , R. Kaiser , G. Karyan , T. Keri , E. Kinney , A. Kisselev , V. Korotkov , V. Kozlov , P. Kravchenko , V. G. Krivokhijine , L. Lagamba , L. Lapikás , I. Lehmann , P. Lenisa , A. López Ruiz , W. Lorenzon , B. -Q. Ma , D. Mahon , N. C. R. Makins , S. I. Manaenkov , L. Manfré , Y. Mao , B. Marianski , A. Martinez de la Ossa , H. Marukyan , C. A. Miller , Y. Miyachi , A. Movsisyan , M. Murray , E. Nappi , Y. Naryshkin , A. Nass , M. Negodaev , W. -D. Nowak , L. L. Pappalardo , R. Perez-Benito , A. Petrosyan , M. Raithel , P. E. Reimer , A. R. Reolon , C. Riedl , K. Rith , G. Rosner , A. Rostomyan , J. Rubin , D. Ryckbosch , Y. Salomatin , F. Sanftl , A. Schäfer , G. Schnell , K. P. Schüler , B. Seitz , T. -A. Shibata , M. Stancari , M. Statera , J. J. M. Steijger , J. Stewart , F. Stinzing , A. Terkulov , R. Truty , A. Trzcinski , M. Tytgat , A. Vandenbroucke , Y. Van Haarlem , C. Van Hulse , D. Veretennikov , V. Vikhrov , I. Vilardi , S. Wang , S. Yaschenko , Z. Ye , S. Yen , W. Yu , V. Zagrebelnyy , D. Zeiler , B. Zihlmann , P. Zupranski

The COMPASS Setup for Physics with Hadron Beams

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.…

Instrumentation and Detectors · Physics 2015-12-09 Ph. Abbon , C. Adolph , R. Akhunzyanov , Yu. Alexandrov , M. G. Alexeev , G. D. Alexeev , A. Amoroso , V. Andrieux , V. Anosov , A. Austregesilo , B. Badelek , F. Balestra , J. Barth , G. Baum , R. Beck , Y. Bedfer , A. Berlin , J. Bernhard , K. Bicker , E. R. Bielert , J. Bieling , R. Birsa , J. Bisplinghoff , M. Bodlak , M. Boer , P. Bordalo , F. Bradamante , C. Braun , A. Bressan , M. Buechele , E. Burtin , L. Capozza , P. Ciliberti , M. Chiosso , S. U. Chung , A. Cicuttin , M. Colantoni , D. Cotte , M. L. Crespo , Q. Curiel , T. Dafni , S. Dalla Torre , S. S. Dasgupta , S. Dasgupta , O. Yu. Denisov , D. Desforge , A. M. Dinkelbach , S. V. Donskov , N. Doshita , V. Duic , W. Duennweber , D. Durand , M. Dziewiecki , A. Efremov , C. Elia , P. D. Eversheim , W. Eyrich , M. Faessler , A. Ferrero , M. Finger , M. Finger , H. Fischer , C. Franco , N. du Fresne von Hohenesche , J. M. Friedrich , V. Frolov , L. Gatignon , F. Gautheron , O. P. Gavrichtchouk , S. Gerassimov , R. Geyer , A. Giganon , I. Gnesi , B. Gobbo , S. Goertz , M. Gorzellik , S. Grabmueller , A. Grasso , M. Gregori , B. Grube , T. Grussenmeyer , A. Guskov , F. Haas , D. von Harrach , D. Hahne , R. Hashimoto , F. H. Heinsius , F. Herrmann , F. Hinterberger , Ch. Hoeppner , N. Horikawa , N. d'Hose , S. Huber , S. Ishimoto , A. Ivanov , Yu. Ivanshin , T. Iwata , R. Jahn , V. Jary , P. Jasinski , P. Joerg , R. Joosten , E. Kabuss , B. Ketzer , G. V. Khaustov , Yu. A. Khokhlov , Yu. Kisselev , F. Klein , K. Klimaszewski , J. H. Koivuniemi , V. N. Kolosov , K. Kondo , K. Koenigsmann , I. Konorov , V. F. Konstantinov , A. M. Kotzinian , O. Kouznetsov , M. Kraemer , Z. V. Kroumchtein , N. Kuchinski , R. Kuhn , F. Kunne , K. Kurek , R. P. Kurjata , A. A. Lednev , A. Lehmann , M. Levillain , S. Levorato , J. Lichtenstadt , A. Maggiora , A. Magnon , N. Makke , G. K. Mallot , C. Marchand , J. Marroncle , A. Martin , J. Marzec , J. Matousek , H. Matsuda , T. Matsuda , G. Menon , G. Meshcheryakov , W. Meyer , T. Michigami , Yu. V. Mikhailov , Y. Miyachi , M. A. Moinester , A. Nagaytsev , T. Nagel , F. Nerling , S. Neubert , D. Neyret , V. I. Nikolaenko , J. Novy , W. -D. Nowak , A. S. Nunes , A. G. Olshevsky , I. Orlov , M. Ostrick , R. Panknin , D. Panzieri , B. Parsamyan , S. Paul , G. Pesaro , V. Pesaro , D. V. Peshekhonov , C. Pires , S. Platchkov , J. Pochodzalla , V. A. Polyakov , J. Pretz , M. Quaresma , C. Quintans , S. Ramos , C. Regali , G. Reicherz , J-M. Reymond , E. Rocco , N. S. Rossiyskaya , J. -Y. Rousse , D. I. Ryabchikov , A. Rychter , A. Samartsev , V. D. Samoylenko , A. Sandacz , S. Sarkar , I. A. Savin , G. Sbrizzai , P. Schiavon , C. Schill , T. Schlueter , K. Schmidt , H. Schmieden , K. Schoenning , S. Schopferer , M. Schott , O. Yu. Shevchenko , L. Silva , L. Sinha , S. Sirtl , M. Slunecka , S. Sosio , F. Sozzi , A. Srnka , L. Steiger , M. Stolarski , M. Sulc , R. Sulej , H. Suzuki , A. Szabelski , T. Szameitat , P. Sznajder , S. Takekawa , J. ter Wolbeek , S. Tessaro , F. Tessarotto , F. Thibaud , V. Tskhay , S. Uhl , I. Uman , M. Virius , L. Wang , T. Weisrock , Q. Weitzel , M. Wilfert , R. Windmolders , H. Wollny , K. Zaremba , M. Zavertyaev , E. Zemlyanichkina , M. Ziembicki , A. Zink

Determination of Delta G/G from Open Charm events at COMPASS

One of the main goals of the COMPASS experiment at CERN is the determination of the gluon polarisation in the nucleon, Delta G/G. It is determined from spin asymmetries in the scattering of 160 GeV/c polarised muons on a polarised LiD…

High Energy Physics - Experiment · Physics 2011-11-10 S. Koblitz

Transverse spin asymmetries at COMPASS: beyond Collins and Sivers effects

One of the important objectives of the COMPASS experiment (SPS, CERN) \cite{Abbon:2007pq} is the exploration of the transverse spin structure of the nucleon via spin dependent azimuthal asymmetries in single-hadron production in deep…

High Energy Physics - Experiment · Physics 2013-07-03 Bakur Parsamyan

Hadron production from $\mu-Deuteron$ scattering at $\sqrt{s}=17 GeV$ at COMPASS

Hadrons proceeding from quasi-real photo-production are one of the many probes accesible at the Common Muon Proton Apparatus for Structure and Spectroscopy (COMPASS) at CERN. These hadrons provide information on the scattering between…

High Energy Physics - Experiment · Physics 2011-08-30 Astrid Morreale

Transverse Spin Structure of the Nucleon from COMPASS

The measurement of transverse spin effects in semi-inclusive deep-inelastic scattering is an important part of the COMPASS physics program. In the years 2002-2004 data were taken by scattering a 160 GeV muon beam on a transversely polarized…

High Energy Physics - Experiment · Physics 2019-08-13 C. Schill

TMD observables in unpolarised Semi-Inclusive DIS at COMPASS

In 2016 and 2017, the COMPASS Collaboration at CERN collected a large sample of DIS events with a longitudinally polarized 160 GeV/c muon beam scattering off a liquid hydrogen target. Part of the collected data has been analyzed to extract…

High Energy Physics - Experiment · Physics 2021-07-23 Andrea Moretti

Exploring the polarization of gluons in the nucleon

We give an overview of the current status of investigations of the polarization of gluons in the nucleon. We describe some of the physics of the spin-dependent gluon parton distribution and its phenomenology in high-energy polarized…

High Energy Physics - Phenomenology · Physics 2008-11-26 Marco Stratmann , Werner Vogelsang

Transverse Spin Effects at COMPASS

Single spin asymmetries in semi-inclusive deep-inelastic scattering off transversely polarized nucleon targets have been under intense experimental investigation over the past few years. They provide new insights into QCD and the nucleon…

High Energy Physics - Experiment · Physics 2009-08-24 H. Wollny

Longitudinal double spin asymmetry $A_1^p$ and spin-dependent structure function $g_1^p$ of the proton at low $x$ and low $Q^2$ from COMPASS

The COMPASS experiment at CERN has collected a large sample of events of inelastic scattering of longitudinally polarised muons off longitudinally polarised protons in the non-perturbative region (four-momentum transfer squared $Q^2<1$…

High Energy Physics - Experiment · Physics 2019-08-13 A. S. Nunes

Transversity Signals in Two-Hadron Production at COMPASS

New results on single spin asymmetries of identified charged pion and kaon pairs produced in deep-inelastic scattering of muons on a transversely polarized 6LiD target are presented. The data were taken in the years 2003 and 2004 with the…

High Energy Physics - Experiment · Physics 2011-01-13 C. Schill

Hadron Spectroscopy in COMPASS

The COmmon Muon and Proton Apparatus for Structure and Spectroscopy (COMPASS) is a multi-purpose fixed-target experiment at the CERN Super Proton Synchrotron (SPS) aimed at studying the structure and spectrum of hadrons. In the naive…

High Energy Physics - Experiment · Physics 2019-08-13 Boris Grube

Single Spin Asymmetries on a transversely polarised proton target at COMPASS

COMPASS is a running fixed-target experiment at the CERN SPS with a rich physics program focused on nucleon spin structure and on hadron spectroscopy. One of the main goals of the spin program is the measurement of the transverse spin…

High Energy Physics - Experiment · Physics 2019-08-13 S. Levorato

Future Programme of COMPASS at CERN

COMPASS at CERN is preparing for a new series of measurements on the nucleon structure comprising deep virtual Compton scattering and hard exclusive meson production using muon beams, as well as Drell-Yan reactions using a polarised proton…

High Energy Physics - Experiment · Physics 2012-06-14 Gerhard K. Mallot

Measurement of the charged-pion polarisability

The COMPASS collaboration at CERN has investigated pion Compton scattering, $\pi^-\gamma\rightarrow \pi^-\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the reaction…

High Energy Physics - Experiment · Physics 2015-03-05 C. Adolph , R. Akhunzyanov , M. G. Alexeev , G. D. Alexeev , A. Amoroso , V. Andrieux , V. Anosov , A. Austregesilo , B. Badelek , F. Balestra , J. Barth , G. Baum , R. Beck , Y. Bedfer , A. Berlin , J. Bernhard , K. Bicker , J. Bieling , R. Birsa , J. Bisplinghoff , M. Bodlak , M. Boer , P. Bordalo , F. Bradamante , C. Braun , A. Bressan , M. Buechele , E. Burtin , L. Capozza , M. Chiosso , S. U. Chung , A. Cicuttin , M. Colantoni , M. L. Crespo , Q. Curiel , S. Dalla Torre , S. S. Dasgupta , S. Dasgupta , O. Yu. Denisov , A. M. Dinkelbach , S. V. Donskov , N. Doshita , V. Duic , W. Duennweber , M. Dziewiecki , A. Efremov , C. Elia , P. D. Eversheim , W. Eyrich , M. Faessler , A. Ferrero , A. Filin , M. Finger , M. jr. Finger , H. Fischer , C. Franco , N. du Fresne von Hohenesche , J. M. Friedrich , V. Frolov , F. Gautheron , O. P. Gavrichtchouk , S. Gerassimov , R. Geyer , I. Gnesi , B. Gobbo , S. Goertz , M. Gorzellik , S. Grabmueller , A. Grasso , B. Grube , T. Grussenmeyer , A. Guskov , T. Guthoerl , F. Haas , D. von Harrach , D. Hahne , R. Hashimoto , F. H. Heinsius , F. Herrmann , F. Hinterberger , Ch. Hoeppner , N. Horikawa , N. d'Hose , S. Huber , S. Ishimoto , A. Ivanov , Yu. Ivanshin , T. Iwata , R. Jahn , V. Jary , P. Jasinski , P. Joerg , R. Joosten , E. Kabuss , B. Ketzer , G. V. Khaustov , Yu. A. Khokhlov , Yu. Kisselev , F. Klein , K. Klimaszewski , J. H. Koivuniemi , V. N. Kolosov , K. Kondo , K. Koenigsmann , I. Konorov , V. F. Konstantinov , A. M. Kotzinian , O. Kouznetsov , M. Kraemer , Z. V. Kroumchtein , N. Kuchinski , R. Kuhn , F. Kunne , K. Kurek , R. P. Kurjata , A. A. Lednev , A. Lehmann , M. Levillain , S. Levorato , J. Lichtenstadt , A. Maggiora , A. Magnon , N. Makke , G. K. Mallot , C. Marchand , A. Martin , J. Marzec , J. Matousek , H. Matsuda , T. Matsuda , G. Meshcheryakov , W. Meyer , T. Michigami , Yu. V. Mikhailov , Y. Miyachi , M. A. Moinester , A. Nagaytsev , T. Nagel , F. Nerling , S. Neubert , D. Neyret , V. I. Nikolaenko , J. Novy , W. -D. Nowak , A. S. Nunes , A. G. Olshevsky , I. Orlov , M. Ostrick , R. Panknin , D. Panzieri , B. Parsamyan , S. Paul , D. Peshekhonov , S. Platchkov , J. Pochodzalla , V. A. Polyakov , J. Pretz , M. Quaresma , C. Quintans , S. Ramos , C. Regali , G. Reicherz , E. Rocco , N. S. Rossiyskaya , D. I. Ryabchikov , A. Rychter , V. D. Samoylenko , A. Sandacz , S. Sarkar , I. A. Savin , G. Sbrizzai , P. Schiavon , C. Schill , T. Schlueter , K. Schmidt , H. Schmieden , K. Schoenning , S. Schopferer , M. Schott , O. Yu. Shevchenko , L. Silva , L. Sinha , S. Sirtl , M. Slunecka , S. Sosio , F. Sozzi , A. Srnka , L. Steiger , M. Stolarski , M. Sulc , R. Sulej , H. Suzuki , A. Szabelski , T. Szameitat , P. Sznajder , S. Takekawa , J. ter Wolbeek , S. Tessaro , F. Tessarotto , F. Thibaud , S. Uhl , I. Uman , M. Virius , L. Wang , T. Weisrock , M. Wilfert , R. Windmolders , H. Wollny , K. Zaremba , M. Zavertyaev , E. Zemlyanichkina , M. Ziembicki , A. Zink

Polarised Drell-Yan results from COMPASS

The COMPASS experiment at CERN is one of the leading experiments studying the nucleon spin structure. Until 2012 the Parton Distribution Functions and the Transverse Momentum Dependent Parton Distribution Functions (TMDs) were extensively…

High Energy Physics - Experiment · Physics 2018-04-26 Celso Franco

Hadronic Physics

A selection of studies highlighting different manifestations of the strong interaction are presented. Many new results have become available this summer in the regimes of discovery, systematic survey, and precision measurements of bound…

High Energy Physics - Experiment · Physics 2008-11-26 Hanna Mahlke

Direct Measurement of the Gluon Polarisation in the Nucleon via Charmed Meson Production

We present the first measurement of the gluon polarisation in the nucleon based on the photon-gluon fusion process tagged by charmed meson production and decay to charged K and pi. The data were collected in polarised muon scattering off a…

High Energy Physics - Experiment · Physics 2008-02-22 COMPASS Collaboration , M. Alekseev

Azimuthal asymmetries from unpolarized data at COMPASS

The investigation of transverse spin and transverse momentum effects in the nucleon is one of the key physics programs of the COMPASS experiment at CERN. COMPASS investigates these effects scattering 160 GeV/c muons off a fixed NH3 or 6LiD…

High Energy Physics - Experiment · Physics 2019-08-13 C. Schill

Key Historical Experiments in Hadron Physics

The experimental observations that led to the quark structure of matter and the development of hadron physics are reviewed with emphasis on the discoveries of mesons and baryons, starting in the 1940s with the pion and kaon which mediate…

History and Philosophy of Physics · Physics 2025-03-20 Claude Amsler