Related papers: Spin Observables in Transition-Distribution-Amplit…

Hadron Spin Dynamics

Spin effects in exclusive and inclusive reactions provide an essential new dimension for testing QCD and unraveling hadron structure. Remarkable new experiments from SLAC, HERMES (DESY), and the Jefferson Laboratory present many challenges…

High Energy Physics - Phenomenology · Physics 2009-09-11 Stanley J. Brodsky

Gamma^*, Z^* production in polarised p-p scattering as a probe of the proton spin structure

We present the results of a detailed study of the large transverse momentum Drell-Yan process, pp --> (Gamma^*, Z^*)X --> l^+l^- X at collider energies, with either one or both protons polarised, allowing the study of single- and…

High Energy Physics - Phenomenology · Physics 2009-10-22 E. Leader , Sridhar K

Longitudinal and transverse spin transfer to $\Lambda$ and $\bar\Lambda$ hyperons in p+p collisions at STAR

The longitudinal or transverse spin transfer to Lambda and anti-Lambda hyperons in polarized proton-proton collisions is expected to be sensitive to the helicity or transversity distributions of strange and anti-strange quarks of the…

High Energy Physics - Experiment · Physics 2018-12-31 Qing-Hua Xu

Generalized Parton Distributions of Pions. Spin Structure of Hadrons

We present an extensive study on generalized parton distributions of pions. In particular, we present the results for the pion-photon transition distribution amplitudes in the Nambu - Jona-Lasinio model. We discuss the phenomenology of such…

High Energy Physics - Phenomenology · Physics 2010-10-15 A. Courtoy

Spin Physics at J-PARC

Spin-physics projects at J-PARC are explained by including future possibilities. J-PARC is the most-intense hadron-beam facility in the high-energy region above multi-GeV, and spin physics will be investigated by using secondary beams of…

High Energy Physics - Phenomenology · Physics 2016-03-23 S. Kumano

Investigating Partons' Transverse Spin with Deep Inelastic Exclusive Experiments

We show how deeply virtual pseudoscalar meson production experiments single out the contribution of the four chiral odd quark-proton GPDs which are related to the so far elusive transversity distribution function, $h_1$. Furthermore, in the…

High Energy Physics - Phenomenology · Physics 2011-05-02 Gary R. Goldstein , Simonetta Liuti

Polarization Effects in Drell-Yan Type Processes h_1+h_2 -> (W,Z,\gamma*,J/psi)+X

The measurement of the angular distribution of leptons from the decay of a $W$, $Z$, $\gamma^{\ast}$, or $\Jpsi$ produced at high transverse momentum in hadronic collisions provides a detailed test of the production and decay mechanism of…

High Energy Physics - Phenomenology · Physics 2009-09-25 E. Mirkes , J. Ohnemus

First Observation of $\Lambda$ Hyperon Transverse Polarization in $\psi(3686)\to\Lambda\bar\Lambda$

Based on $(448.1\pm2.9)\times10^{6}$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, we present the first observation of spin transverse polarization of $\Lambda$ and $\bar\Lambda$ hyperons produced coherently…

High Energy Physics - Experiment · Physics 2025-09-22 BESIII Collaboration , M. Ablikim , M. N. Achasov , P. Adlarson , X. C. Ai , R. Aliberti , A. Amoroso , Q. An , Y. Bai , O. Bakina , Y. Ban , H. -R. Bao , V. Batozskaya , K. Begzsuren , N. Berger , M. Berlowski , M. B. Bertani , D. Bettoni , F. Bianchi , E. Bianco , A. Bortone , I. Boyko , R. A. Briere , A. Brueggemann , H. Cai , M. H. Cai , X. Cai , A. Calcaterra , G. F. Cao , N. Cao , S. A. Cetin , X. Y. Chai , J. F. Chang , T. T. Chang , G. R. Che , Y. Z. Che , C. H. Chen , Chao Chen , G. Chen , H. S. Chen , H. Y. Chen , M. L. Chen , S. J. Chen , S. M. Chen , T. Chen , X. R. Chen , X. T. Chen , X. Y. Chen , Y. B. Chen , Y. Q. Chen , Z. K. Chen , J. Cheng , L. N. Cheng , S. K. Choi , X. Chu , G. Cibinetto , F. Cossio , J. Cottee-Meldrum , H. L. Dai , J. P. Dai , X. C. Dai , A. Dbeyssi , R. E. de Boer , D. Dedovich , C. Q. Deng , Z. Y. Deng , A. Denig , I. Denisenko , M. Destefanis , F. De Mori , X. X. Ding , Y. Ding , Y. Ding , Y. X. Ding , J. Dong , L. Y. Dong , M. Y. Dong , X. Dong , M. C. Du , S. X. Du , S. X. Du , Y. Y. Duan , Z. H. Duan , P. Egorov , G. F. Fan , J. J. Fan , Y. H. Fan , J. Fang , J. Fang , S. S. Fang , W. X. Fang , Y. Q. Fang , L. Fava , F. Feldbauer , G. Felici , C. Q. Feng , J. H. Feng , L. Feng , Q. X. Feng , Y. T. Feng , M. Fritsch , C. D. Fu , J. L. Fu , Y. W. Fu , H. Gao , Y. Gao , Y. N. Gao , Y. N. Gao , Y. Y. Gao , Z. Gao , S. Garbolino , I. Garzia , L. Ge , P. T. Ge , Z. W. Ge , C. Geng , E. M. Gersabeck , A. Gilman , K. Goetzen , J. Gollub , J. D. Gong , L. Gong , W. X. Gong , W. Gradl , S. Gramigna , M. Greco , M. D. Gu , M. H. Gu , C. Y. Guan , A. Q. Guo , J. N. Guo , L. B. Guo , M. J. Guo , R. P. Guo , X. Guo , Y. P. Guo , A. Guskov , J. Gutierrez , J. Y. Han , T. T. Han , F. Hanisch , K. D. Hao , X. Q. Hao , F. A. Harris , C. Z. He , K. K. He , K. L. He , F. H. Heinsius , C. H. Heinz , Y. K. Heng , C. Herold , P. C. Hong , G. Y. Hou , X. T. Hou , Y. R. Hou , Z. L. 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Baryon-baryon and baryon-antibaryon interaction amplitudes in the spin--momentum operator expansion method

Partial wave scattering amplitudes in baryon-baryon and baryon-antibaryon collisions and amplitudes for the production and decay of baryon resonances are constructed in the framework of the spin-momentum operator expansion method. The…

High Energy Physics - Phenomenology · Physics 2009-09-29 A. V. Anisovich , V. V. Anisovich , E. Klempt , V. A. Nikonov , A. V. Sarantsev

Exclusive photo- and electroproduction of mesons in the GeV region

We consider the reactions gamma p --> M B, with M B being either K+ Lambda, K+ Sigma0, or Pi n, within a diquark model which is based on perturbative QCD. The model parameters and the quark-diquark distribution amplitudes of the baryons are…

High Energy Physics - Phenomenology · Physics 2007-05-23 G. Folberth , R. Rossmann , W. Schweiger

Spin transfer and polarization of antihyperons in lepton induced reactions

We study the polarization of antihyperon in lepton induced reactions such as $e^+e^-\to\bar H+X$ and $l+p\to l'+\bar H+X$ with polarized beams using different models for spin transfer in high energy fragmentation processes. We compare the…

High Energy Physics - Phenomenology · Physics 2009-11-11 Hui Dong , Jian Zhou , Zuo-tang Liang

Polarized Lambda-Baryon Production in pp Collisions

We study the production of longitudinally polarized Lambda-baryons in single-spin pp collisions at RHIC and HERA-N as a means of determining the spin-dependent Lambda fragmentation functions. It is shown that a measurement of the rapidity…

High Energy Physics - Phenomenology · Physics 2009-10-31 D. de Florian , M. Stratmann , W. Vogelsang

Spin asymmetries in jet-hyperon production at LHC

We consider polarized Lambda hyperon production in proton-proton scattering, p p -> (\Lambda^\uparrow jet) jet X, in the kinematical region of the LHC experiments, in particular the ALICE experiment. We present a new Lambda polarization…

High Energy Physics - Phenomenology · Physics 2008-11-26 D. Boer , C. J. Bomhof , D. S. Hwang , P. J. Mulders

Spin Transfer in Exclusive Lambda Production from pp Collisions at 3.67 GeV/c

We report the first polarization transfer measurements for exclusive hyperon production reactions. The normal spin transfer coefficient DNN for pp -> p K+ Lambda is large and negative for forward Lambda production at a beam momentum of 3.67…

Nuclear Experiment · Physics 2009-10-31 DISTO Collaboration , F. Balestra , Y. Bedfer , R. Bertini , L. C. Bland , A. Brenschede , F. Brochard , M. P. Bussa , V. Chalyshev , Seonho Choi , M. Debowski , M. Dzemidzic , J. -Cl. Faivre , I. V. Falomkin , L. Fava , L. Ferrero , J. Foryciarz , V. Frolov , R. Garfagnini , D. Gill , A. Grasso , S. Heinz , V. V. Ivanov , W. W. Jacobs , W. Kuehn , A. Maggiora , M. Maggiora , A. Manara , D. Panzieri , H. -W. Pfaff , G. Piragino , G. B. Pontecorvo , A. Popov , J. Ritman , P. Salabura , F. Tosello , S. E. Vigdor , G. Zosi

Spin and Isospin Effects in the NN -> NK Lambda Reaction Near Threshold

The spin and isospin structure of the amplitudes and observables for K+Lambda production in nucleon-nucleon collisions in the near-threshold region is analysed. It is shown that, with reasonable values for the relative strengths of the pi…

Nuclear Theory · Physics 2009-11-10 Goran Faldt , Colin Wilkin

Exclusive photo- and electroproduction of mesons at large momentum transfer

We analyze the reactions gamma+p => M+B, with M B being either K+ Lambda, K+ Sigma0, or pi+ n, within perturbative QCD, allowing for diquarks as quasi-elementary constituents of baryons. The diquark-model parameters and the quark-diquark…

High Energy Physics - Phenomenology · Physics 2007-05-23 G. Folberth , R. Rossmann , W. Schweiger

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

Single-inclusive hadron production in transversely polarized p-p and pbar-p collisions with threshold resummation

We investigate the resummation of large logarithmic perturbative corrections to the partonic cross sections for single-inclusive high-p_T hadron production in collisions of transversely polarized hadrons. We perform the resummation to…

High Energy Physics - Phenomenology · Physics 2008-11-26 Daniel de Florian , Werner Vogelsang , Federico Wagner

PHENIX Measurement of Parity-Violating Single Spin Asymmetry in W Production in p+p Collisions at 500 GeV

The flavor-separated polarized parton distribution functions for light quarks and anti-quarks in the proton can be studied in the production of $W$ bosons in $p$+$p$ collisions. The $W$s are produced in processes like $u+\bar{d}\rightarrow…

High Energy Physics - Experiment · Physics 2019-08-13 Stephen Pate

Cross sections and spin asymmetries in vector meson leptoproduction

Light vector meson leptoproduction is analyzed on the basis of the generalized parton distributions. Our results on the cross section and spin effects are in good agrement with experiment at HERA, COMPASS and HERMES energies. Predictions…

High Energy Physics - Phenomenology · Physics 2009-10-23 S. V. Goloskokov