Related papers: The transverse polarization of $\Lambda$ hyperons …

Lambda polarization in pp -> p\Lambda K^+ \pi^+\pi^-\pi^+\pi^-

We show that there is a correlation between the invariant mass of the produced \Lambda K^+, \Lambda K^+\pi^+\pi^- or \Lambda K^+ \pi^+\pi^-\pi^+\pi^- system in the exclusive reaction pp\to p\Lambda K^+\pi^+\pi^-\pi^+\pi^- and the…

High Energy Physics - Phenomenology · Physics 2015-06-25 Zuo-tang Liang , Tie-shi Li

Evolution of the helicity and transversity Transverse-Momentum-Dependent parton distributions

We examine the QCD evolution of the helicity and transversity parton distribution functions when including also their dependence on transverse momentum. Using an appropriate definition of these polarized transverse momentum distributions…

High Energy Physics - Phenomenology · Physics 2015-06-15 Alessandro Bacchetta , Alexei Prokudin

Dihadron Fragmentation Functions and Transversity

We present preliminary results for an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. Data…

High Energy Physics - Phenomenology · Physics 2015-06-23 Marco Radici , A. Courtoy , Alessandro Bacchetta

TMD factorization and evolution at large $b_T$

In using transverse-momentum-dependent (TMD) parton densities and fragmentation functions, important non-perturbative information is at large transverse position $b_T$. This concerns both the TMD functions and their evolution. Fits to high…

High Energy Physics - Phenomenology · Physics 2015-07-21 John Collins , Ted C. Rogers

Transverse momentum dependent shape function for $J/\psi$ production in SIDIS

It has been shown previously that the transverse momentum dependent (TMD) factorization of heavy quarkonium production requires a TMD shape function. Its perturbative tail can be extracted by matching the cross sections valid at low and…

High Energy Physics - Phenomenology · Physics 2023-09-07 Daniël Boer , Jelle Bor , Luca Maxia , Cristian Pisano , Feng Yuan

Measurement of Lambda polarization in muon neutrino charged current interactions in NOMAD

The Lambda polarization in muon neutrino charged current interactions has been measured in the NOMAD experiment. We observe negative polarization along the W - boson direction which is enhanced in the target fragmentation region: Px (xF <…

High Energy Physics - Phenomenology · Physics 2009-11-07 Dmitry V. Naumov

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. Hou , H. M. Hu , J. F. Hu , Q. P. Hu , S. L. Hu , T. Hu , Y. Hu , Z. M. Hu , G. S. Huang , K. X. Huang , L. Q. Huang , P. Huang , X. T. Huang , Y. P. Huang , Y. S. Huang , T. Hussain , N. Hüsken , N. in der Wiesche , J. Jackson , Q. Ji , Q. P. Ji , W. Ji , X. B. Ji , X. L. Ji , X. Q. Jia , Z. K. Jia , D. Jiang , H. B. Jiang , P. C. Jiang , S. J. Jiang , X. S. Jiang , Y. Jiang , J. B. Jiao , J. K. Jiao , Z. Jiao , S. Jin , Y. Jin , M. Q. Jing , X. M. Jing , T. Johansson , S. Kabana , X. L. Kang , X. S. Kang , B. C. Ke , V. Khachatryan , A. Khoukaz , O. B. Kolcu , B. Kopf , L. Kröger , L. Krümmel , M. Kuessner , X. Kui , N. Kumar , A. Kupsc , W. Kühn , Q. Lan , W. N. Lan , T. T. Lei , M. Lellmann , T. Lenz , C. Li , C. Li , C. H. Li , C. K. Li , D. M. Li , F. Li , G. Li , H. B. Li , H. J. Li , H. L. Li , H. N. Li , Hui Li , J. R. Li , J. S. Li , J. W. Li , K. Li , K. L. Li , L. J. Li , Lei Li , M. H. Li , M. R. Li , P. L. Li , P. R. Li , Q. M. Li , Q. X. Li , R. Li , S. X. Li , Shanshan Li , T. Li , T. Y. Li , W. D. Li , W. G. Li , X. Li , X. H. Li , X. K. Li , X. L. Li , X. Y. Li , X. Z. Li , Y. Li , Y. P. Li , Z. H. Li , Z. J. Li , Z. X. Li , Z. Y. Li , C. Liang , H. Liang , Y. F. Liang , Y. T. Liang , G. R. Liao , L. B. Liao , M. H. Liao , Y. P. Liao , J. Libby , A. Limphirat , C. C. Lin , D. X. Lin , T. Lin , B. J. Liu , B. X. Liu , C. Liu , C. X. Liu , F. Liu , F. H. Liu , Feng Liu , G. M. Liu , H. Liu , H. B. Liu , H. M. Liu , Huihui Liu , J. B. Liu , J. J. Liu , K. Liu , K. Liu , K. Y. Liu , Ke Liu , L. Liu , L. C. Liu , Lu Liu , M. H. Liu , P. L. Liu , Q. Liu , S. B. Liu , T. Liu , W. M. Liu , W. T. Liu , X. Liu , X. K. Liu , X. L. Liu , X. Y. Liu , Y. Liu , Y. Liu , Y. B. Liu , Z. A. Liu , Z. D. Liu , Z. Q. Liu , Z. Y. Liu , X. C. Lou , H. J. Lu , J. G. Lu , X. L. Lu , Y. Lu , Y. H. Lu , Y. P. Lu , Z. H. Lu , C. L. Luo , J. R. Luo , J. S. Luo , M. X. Luo , T. Luo , X. L. Luo , Z. Y. Lv , X. R. Lyu , Y. F. Lyu , Y. H. Lyu , F. C. Ma , H. L. 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Unpolarised TMD PDFs and FFs and the role of transverse momentum dependence in azimuthal spin asymmetries

In the TMD approach, the average transverse momentum of the unpolarised TMD PDFs and FFs is crucial not only to reproduce unpolarised cross sections and hadron multiplicities, but also for the understanding of azimuthal and spin…

High Energy Physics - Phenomenology · Physics 2019-02-14 M. Anselmino , M. Boglione , U. D'Alesio , F. Murgia , A. Prokudin

Measurement of Lambda and Lambda-bar polarization in muon neutrino charged current interactions in NOMAD

The Lambda and Lambda-bar polarizations in muon neutrino charged current interactions have been measured in the NOMAD experiment. The event sample (8087 reconstructed Lambda's and 649 Lambda-bar's) is more than an order of magnitude larger…

High Energy Physics - Phenomenology · Physics 2007-05-23 Dmitry V. Naumov

Twist-3 Gluon Fragmentation Contribution to Hyperon Polarization in Semi-Inclusive Deep Inelastic Scattering

We derive the twist-3 gluon fragmentation function (FF) contribution to the transversely polarized hyperon production in semi-inclusive deep inelastic scattering, $ep\to e\Lambda^\uparrow X$, in the leading order (LO) with respect to the…

High Energy Physics - Phenomenology · Physics 2022-06-08 Riku Ikarashi , Yuji Koike , Kenta Yabe , Shinsuke Yoshida

Searching for TMD-factorization breaking in p+p and p+A collisions: Color interactions in QCD

Dihadron and isolated direct photon-hadron angular correlations have been measured in $p$+$p$ and $p$+A collisions to investigate possible effects from transverse-momentum-dependent factorization breaking due to color exchange between…

Nuclear Experiment · Physics 2019-12-24 Christine A. Aidala

Transverse Polarization of Top Quark Pairs at the Tevatron and the Large Hadron Collider

We investigate the prospects to observe effects of transverse polarization of top quarks in $pp,p\bar{p}\to t\bar{t}X$. QCD absorptive parts generate a polarization of top quarks and antiquarks transverse to the production plane in the…

High Energy Physics - Phenomenology · Physics 2009-10-28 Werner Bernreuther , Arnd Brandenburg , Peter Uwer

Transverse Momentum Dependent Parton Distributions at Small-x

We study the transverse momentum dependent (TMD) parton distributions at small-x in a consistent framework that takes into account the TMD evolution and small-x evolution simultaneously. The small-x evolution effects are included by…

High Energy Physics - Phenomenology · Physics 2017-06-28 Bo-Wen Xiao , Feng Yuan , Jian Zhou

Role and Properties of Wilson Lines in Transverse-Momentum-Dependent Parton Distribution Functions

We summarize the renormalization-group properties of transverse-momentum dependent (TMD) parton distribution functions (PDF)s arguing that in the light-cone gauge the overlapping ultraviolet and rapidity divergences cannot be solely…

High Energy Physics - Phenomenology · Physics 2011-02-03 N. G. Stefanis , I. O. Cherednikov , A. I. Karanikas

Single-spin asymmetries in the leptoproduction of transversely polarized $\Lambda$ hyperons

We analyze single-spin asymmetries (SSAs) in the leptoproduction of transversely polarized $\Lambda$ hyperons within the collinear twist-3 formalism. We calculate both the distribution and fragmentation terms in two different gauges…

High Energy Physics - Phenomenology · Physics 2015-05-20 K. Kanazawa , A. Metz , D. Pitonyak , M. Schlegel

Spin transfer in high energy fragmentation processes

We point out that measuring longitudinal polarizations of different hyperons produced in lepton induced reactions are ideal to study the spin transfer of the fragtmenting quark to produced hadron in high energy hadronization processes. We…

High Energy Physics - Phenomenology · Physics 2007-05-23 Zuo-tang Liang , Chun-xiu Liu

The saturation scale and its x-dependence from Lambda polarization studies

The transverse polarization of forward Lambda hyperons produced in high-energy p-A collisions is expected to display an extremum at a transverse momentum around the saturation scale. This was first observed within the context of the…

High Energy Physics - Phenomenology · Physics 2009-01-30 Daniel Boer , Andre Utermann , Erik Wessels

Gluon TMDs in quarkonium production

I report on our investigations into the impact of (un)polarized transverse momentum dependent parton distribution functions (TMD PDFs or TMDs) for gluons at hadron colliders, especially at A Fixed Target Experiment at the LHC (AFTER@LHC).…

High Energy Physics - Phenomenology · Physics 2016-05-25 Andrea Signori

The electromagnetic form factors and spin polarization of $\Lambda_c^+$ in the process $e^+ e^- \to \Lambda^+_c \bar{\Lambda}^-_c$

The total cross sections of the process $e^+ e^-\to \Lambda_c^+ \bar{\Lambda}_c^-$ close to the threshold are calculated within the vector meson dominance model. It is found that the theoretical results can describe the current experimental…

High Energy Physics - Phenomenology · Physics 2024-12-24 Cheng Chen , Bing Yan , Ju-Jun Xie

Recursive fragmentation of a polarized quark

The thesis is devoted to the study of the fragmentation process of polarized quarks, and in particular of the Collins effect used for the extraction of the quark transversity distribution. The aim is to include the spin degree of freedom in…

High Energy Physics - Phenomenology · Physics 2020-04-02 Albi Kerbizi