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

Alekseev, M.; Alexakhin, V.; Alexandrov, Yu.; Alexeev, G. D.; Amoroso, A.; Arbuzov, A. B.; Badełek, B.; Balestra, F.; Ball, J.; Barth, J.; Baum, G.; Bedfer, Y.; Bernet, C.; Bertini, R.; Bettinelli, M.; Birsa, R.; Bisplinghoff, J.; Bordalo, P.; Bradamante, F.; Bravar, A.; Bressan, A.; Brona, G.; Burtin, E.; Bussa, M.P.; Chapiró, A.; Chiosso, M.; Cicuttin, A.; Colantoni, M.; Costa, S.; Crespo, M.L.; Torre, S. Dalla; Dafní, T.; Das, Sudipta; Dasgupta, S.; Masi, R. De; Dedek, N.; Денисов, О.; Dhara, L.; Diaz, V.; Dinkelbach, A.M.; Donskov, S.V.; Dorofeev, V.; Doshita, N.; Duic, V.; Dünnweber, W.; Ефремов, А. В.; Eversheim, P.D.; Eyrich, W.; Faessler, M.; Falaleev, V.; Ferrero, A.; Ferrero, L.; Finger, M.; Fischer, H.; Franco, C.; Franz, J.; Jm, Friedrich; Frolov, V. V.; Garfagnini, R.; Gautheron, F.; Gavrichtchouk, O.P.; Gazda, R.; Gerassimov, S.; Geyer, R.; Giorgi, M. A.; Gobbo, B.; Goertz, S.; Gorin, A.; Grabmüller, S.; Grajek, O.A.; Grasso, A.; Grube, B.; Gushterski, R.; Guskov, A.; Haas, Florian; Hannappel, J.; Harrach, D. von; Hasegawa, T.; Heckmann, J.; Hedicke, S.; Heinsius, F. H.; Hermann, R.; Heß, C.; Hinterberger, F.; Hodenberg, M. von; Horikawa, N.; Horikawa, S.; d’Hose, N.; Ilgner, C.; Ioukaev, A.I.; Ishimoto, S.; Ivanov, О. N.; Ivanshin, Yu.; Iwata, T.; Jahn, R.; Janata, A.; Jasinski, P.; Joosten, R.; Jouravlev, N.I.; Kabuß, E.; Kang, D.; Ketzer, B.; Khaustov, G.V.; Khokhlov, Yu.A.; Kisselev, Yu.; Klein, F.; Klimaszewski, K.; Koblitz, S.; Koivuniemi, J.H.; Kolosov, V.N.; Komissarov, E.V.; Kondo, K.; Königsmann, K.; Konorov, I.; Константинов, В.Ф.; Korentchenko, A.S.; Korzenev, A.; Kotzinian, A.M.; Koutchinski, N.A.; Kouznetsov, O.; Král, A.; Kravchuk, N. P.; Kroumchtein, Z.V.; Kühn, Ralf; Kunne, F.; Kurek, K.; Ladygin, M.E.; Lamanna, M.; Goff, J. M. Le; Lednev, A.A.; Lehmann, A.; Levorato, S.; Lichtenstadt, J.; Liška, T.; Ludwig, I.; Maggiora, A.; Maggiora, M.; Magnon, A.; Mallot, G.K.; Mann, A.; Marchand, Claude; Marroncle, J.; Martin, A.; Marzec, J.; Massmann, F.; Matsuda, T.; Maximov, A.; Meyer, W.; Mielech, A.; Mikhailov, Yu.V.; Moinester, M. A.; Mutter, A.; Nagaytsev, A.; Nagel, T.; Nähle, O.; Nassalski, J.; Neliba, S.; Nerling, F.; Neubert, S.; Neyret, D.; Nikolaenko, V.; Nikolaev, K.; Оlshevsky, А.G.; Ostrick, M.; Padee, A.; Pagano, Paolo; Panebianco, S.; Panknin, R.; Panzieri, D.; Paul, S.; Pawlukiewicz-Kaminska, B.; Pesaro, G.; Peshekhonov, D.V.; Peshekhonov, V. D.; Piragino, G.; Platchkov, S.; Pochodzalla, J.; Polák, Jaroslav; Polyakov, V.A.; Pretz, J.; Procureur, S.; Quintans, C.; Rajotte, Jean-François; Ramos, S.; Rapatsky, V.; Reicherz, G.; Reggiani, D.; Richter, A.; Robinet, F.; Rocco, E.; Rondio, E.; Rozhdestvensky, A.M.; Ryabchikov, D.I.; Samoylenko, V.D.; Sandacz, A.; Santos, H.; Sapozhnikov, M. G.; Sarkar, S.; Savin, I.; Sbrizzai, G.; Schiavon, P.; Schill, C.; Schmitt, L.; Schönmeier, P.; Schröder, W.; Shevchenko, O.Yu.; Siebert, H. W.; Silva, L.; Sinha, L.; Sissakian, A.; Slunečka, M.; Smirnov, G.I.; Sosio, S.; Sozzi, F.; Srnka, A.; Stinzing, F.; Stolarski, M.; Sugonyaev, V.P.; Šulc, M.; Sulej, R.; Tchalishev, V.V.; Tessaro, S.; Tessarotto, F.; Teufel, Andreas; Tkatchev, L. G.; Venugopal, G.; Virius, M.; Vlassov, N.V.; Vossen, A.; Webb, Richard; Weise, E.; Weitzel, Q.; Windmolders, R.; Wirth, S.; Wiślicki, W.; Wollny, H.; Заремба, К.; Zavertyaev, M.; Zemlyanichkina, E.; Zhao, J.; Ziegler, Robert; Zvyagin, A.

doi:10.1016/j.physletb.2009.01.060

Cited by 239 publications

(112 citation statements)

References 50 publications

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“…On the other hand, asymmetries measured by COMPASS using higher energy muons on a deuteron target are consistent with zero [115]. As illustrated in figures 17 and 21, the non-zero results for the proton are now firmly established by recent more precise preliminary data [108], while the most recent results for the deuteron remain consistent with zero [109]. For the proton target, the Collins azimuthal amplitude for π + is clearly positive and non-zero, while it is negative and at least as large for π − .…”

Section: Recent Semi-inclusive Data With Transverse Target Polarizationmentioning

confidence: 74%

“…The Sivers sinusoidal amplitude of the asymmetry with respect to transverse polarization of a proton [108] (deuteron [109]) target, for the semi-inclusive production by positrons (muons) of identified charged mesons as labelled in the upper (lower) panels, as a function of x, z or p h,T (the latter appearing as P T in the figure). The sign of the amplitudes is according to the Trento conventions [110].…”

Section: Recent Semi-inclusive Data With Transverse Target Polarizationmentioning

confidence: 99%

See 1 more Smart Citation

Spin-polarized high-energy scattering of charged leptons on nucleons

Burkardt¹,

Miller²,

Nowak³

2009

Rep. Prog. Phys.

103

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The proton is a composite object with spin one-half, understood to contain highly relativistic spin one-half quarks exchanging spin-one gluons, each possibly with significant orbital angular momenta. While their fundamental interactions are well described by quantum chromodynamics (QCD), our standard theory of the strong interaction, non-perturbative calculations of the internal structure of the proton based directly on QCD are beginning to provide reliable results. Most of our present knowledge of the structure of the proton is based on experimental measurements interpreted within the rich framework of QCD. An area presently attracting intense interest, both experimental and theoretical, is the relationship between the spin of the proton and the spins and orbital angular momenta of its constituents. While remarkable progress has been made, especially in the last decade, the discovery and investigation of new concepts have revealed that much more remains to be learned. This progress is reviewed and an outlook for the future is offered.

show abstract

Section: Recent Semi-inclusive Data With Transverse Target Polarizationmentioning

confidence: 74%

Section: Recent Semi-inclusive Data With Transverse Target Polarizationmentioning

confidence: 99%

Spin-polarized high-energy scattering of charged leptons on nucleons

Burkardt¹,

Miller²,

Nowak³

2009

Rep. Prog. Phys.

103

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show abstract

“…In the large x region common to both experiments, the measurements are in good agreement, a non obvious result due to the different kinematic range covered: in the last x bins, the COMPASS Q 2 is larger of a factor 2-3 wrt HERMES one. All the asymmetries measured by COMPASS on deuteron [5,6] are found to be compatible with zero, also for kaons. This result is interpreted as a cancellation between the u and d quark contribution in an isoscalar target.…”

Section: Collins Asymmetriesmentioning

confidence: 89%

“…Results for these asymmetries on a deuterium target are also available [5,6], allowing a handle on the d-quark PDF. All the asymmetries measured on deuterium have been found compatible with zero, interpreted as a cancellation of the u and d quark contributions in the isocalar deuterium.…”

Section: Sivers Asymmetriesmentioning

confidence: 99%

Transverse spin and transverse momentum structure of the nucleon from the COMPASS experiment

Sozzi

2014

EPJ Web of Conferences

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Abstract. COMPASS is a fixed target experiment at the CERN SPS M2 beam line, taking data since year 2002. Part of the physics programme is dedicated to the study of the transverse spin and transverse momentum structure of the nucleon, by means of semi-inclusive deeply inelastic lepton scattering (SIDIS). For these measurements, data have been collected using transversely polarised proton (NH 3 ) and deuteron ( 6 LiD) targets. A selection of the results on the azimuthal asymmetries measured is presented, with particular focus on the most recent measurements from the data collected in 2007 and 2010 with the proton target. These results exhibit clear signals for the Collins asymmetry, interpreted as a convolution of a non-zero transversity PDF and Collins fragmentation function, and for the Sivers asymmetry which is related to the Sivers function, the most famous and discussed of the TMD PDFs. The data collected with the 6 LiD target, have also been recently analysed to search for the azimuthal modulations in the production of hadrons which are expected to be present in the unpolarised part of the SIDIS cross-section. The azimuthal hadron asymmetries, which are related to the Boer-Mulders TMD PDF, show strong and somewhat puzzling kinematical dependencies.

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“…the Sivers effect. The Sivers effect has been measured by three different collaborations: HERMES at DESY [30], COMPASS at CERN [31], and Hall A at Jefferson Lab [32]. Several parametrizations have been figured out to extract the x dependence of the Sivers function from these data.…”

Section: Transverse Momentum Distributions (Tmds)mentioning

confidence: 99%

Imaging the proton

Radici

2016

AIP Conference Proceedings

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Abstract. We illustrate the need and the advantages of a multi-dimensional exploration of the structure of the nucleon, and in general of hadrons. We introduce new appropriate tools like the Transverse Momentum Distributions (TMDs), which enable us to explore in momentum space the dynamics of partons beyond the usual collinear approximation adopted in the QCD analysis of hard processes. We briefly touch upon the possible breaking of universality for a specific category of TMDs; as an example, we describe the Sivers effect as a fundamental test of our understanding of the color force in QCD. We introduce also the Generalized Parton Distributions (GPDs), which give us a multidimensional picture of partons inside hadrons in configuration space. We emphasize the nontrivial relation between TMDs and GPDs, which are not one the Fourier transformed of the other. We describe the possibility of using these tools to address the (orbital) angular momentum of partons, and we highlight the latest results on the long standing problem of the nucleon spin sum rule. We conclude by briefly mentioning exciting developments from upcoming experiments and from projects on a longer time range.

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

Cited by 239 publications

References 50 publications

Spin-polarized high-energy scattering of charged leptons on nucleons

Spin-polarized high-energy scattering of charged leptons on nucleons

Transverse spin and transverse momentum structure of the nucleon from the COMPASS experiment

Imaging the proton

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