Comparison of spin asymmetries and cross sections in π0 production by 200 GeV polarized antiprotons and protons

Adams, T.; Akchurin, N.; Belikov, N.I.; Bystrický, J.; Corcoran, M.; Cossairt, J.D.; Cranshaw, J.; Derevschikov, A. A.; En’yo, H.; Funahashi, H.; Goto, Y.; Grachov, O.; Grosnick, D.; Hill, D.; Imai, K.; Itow, Y.; Iwatani, Kazuo; Krueger, K.; Kuroda, K.; Laghai, M.; Lehar, F.; Lesquen, A. de; Lopiano, D.; Luehring, F.; Mäki, T.; Makino, S.; Masaike, A.; Matulenko, Yu. A.; Meschanin, A.; Michalowicz, A.; Miller, Donald H.; Miyake, Kazumasa; Nagamine, T.; Nessi‐Tedaldi, F.; Nessi, M.; Nguyen, C.; Nurushev, S. B.; Ōhashi, Y.; Onel, Y.; Patalakha, D. I.; Pauletta, G.; Penzo, A.; Read, A. L.; Roberts, J.; Rossum, L. van; Rykov, V. L.; Saito, N.; Salvato, G.; Schiavon, P.; Skeens, J.; Solov'yanov, V.L.; Spinka, H. M.; Takashima, R.; Takéutchi, F.; Tamura, N.; Tanaka, N.; Underwood, D. G.; Vasiliev, A.; Villari, A.; White, J. L.; Yamashita, S.; Yokosawa, A.; Yoshida, T.; Zanetti, A.

doi:10.1016/0370-2693(91)91351-u

Cited by 228 publications

(123 citation statements)

References 11 publications

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“…The experiment covered essentially two different kinematical regions: 0.2 ≤ x F ≤ 0.6 and p T in the range 0.2 ÷ 2.0 GeV/c (the forward production, or beam fragmentation, region); |x F | ≤ 0.15 and p T values up to 4.0 GeV/c (the central rapidity region). The main results gathered by the E704 Collaboration can be summarized as follows: 1) Large SSA's (up to 30-40% in magnitude) have been measured for inclusive pion production in the large positive x F region, for polarized proton and antiproton beams colliding with an unpolarized hydrogen target [47,48,49,50]. For both neutral and charged pions the SSA was found to be almost zero at low x F , up to x F ∼ 0.3, where it starts raising with increasing x F , reaching values of ∼ 15% and 30 − 40% in size for π 0 's and π ± 's respectively [see Fig.…”

Section: E704-fermilab Resultsmentioning

confidence: 99%

“…3 (left panel) we plot all different maximized contributions to A N for the p ↑ p → π + +X process in the E704 experimental configuration, for which very large values of A N have been measured [47,48,49]. Notice that, whenever different terms could combine with different signs (e.g., Sivers or Collins functions for different quark flavours), their contributions have been summed always with the same sign, in order to avoid any kind of cancelations not resulting from azimuthal factors and phase-space integrations.…”

Section: Pion Kaon and Heavy Meson Productionmentioning

confidence: 99%

“…This implies that the extraction of the quark Sivers functions is sensitive to the relative weight of the leading and non-leading terms in a specific set of FF's. [47,48,49].…”

Section: Pion Kaon and Heavy Meson Productionmentioning

confidence: 99%

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Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

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In this article we review the present understanding of azimuthal and single spin asymmetries for inclusive and semi-inclusive particle production in unpolarized and polarized hadronic collisions at high energy and moderately large transverse momentum. After summarizing the experimental information available, we discuss and compare the main theoretical approaches formulated in the framework of perturbative QCD. We then present in some detail a generalization of the parton model with inclusion of spin and intrinsic transverse momentum effects. In this context, we extensively discuss the phenomenology of azimuthal and single spin asymmetries for several processes in different kinematical configurations. A comparison with the predictions of other approaches, when available, is also given. We finally emphasize some relevant open points and challenges for future theoretical and experimental investigation.

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Section: E704-fermilab Resultsmentioning

confidence: 99%

Section: Pion Kaon and Heavy Meson Productionmentioning

confidence: 99%

See 1 more Smart Citation

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

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show abstract

“…Several other analyses furthered the development of this framework -see, e.g., [7][8][9][10][11][12][13][14]. In addition, this theoretical work has been complimented by many experimental measurements of A N at proton-(anti)proton accelerators over the last two decades [15][16][17][18][19][20][21][22][23]. Most of this experimental data has come in the form of light-hadron asymmetries A h N , e.g., h = π, K, η, with the exception of the jet asymmetry A jet N recently measured by the A N DY Collaboration [22].…”

Section: Introductionmentioning

confidence: 90%

Transverse single-spin asymmetries inp↑p→γXfrom quark-gluon-quark correlations in the proton

et al. 2015

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We analyze the transverse single-spin asymmetry in direct photon production from proton-proton collisions, denoted A γ N , within collinear twist-3 factorization. We provide a calculation of the contribution due to quark-gluon-quark correlations in the unpolarized proton as well as summarize previous studies on those effects in the polarized proton. Both soft-gluon poles and soft-fermion poles are considered. From this complete result we then estimate A γ N , including error bands due to uncertainties in the non-perturbative inputs, at kinematics relevant for planned measurements of this observable at the Relativistic Heavy Ion Collider. We find A γ N can allow for a "clean" extraction of the Qiu-Sterman function, which could lead to a definitive solution to the so-called "sign mismatch" crisis. Since we use the Sivers function extracted from semi-inclusive deep-inelastic scattering to develop our input for the Qiu-Sterman function, this reaction can also make a statement about the process dependence of the Sivers function.

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“…2 Note that to date there is no unambiguous experimental evidence for the QCD odderon. If our mechanism for generating STSA can be isolated experimentally from other contributions, it may constitute the first direct observation of the QCD odderon!…”

Section: B Spin Asymmetry and C-parity In Quark Productionmentioning

confidence: 99%

A New Mechanism for Generating a Single Transverse Spin Asymmetry

Sievert

2013

Nuclear Physics A

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We propose a new mechanism for generating a single transverse spin asymmetry (STSA) in polarized proton-proton and proton-nucleus collisions in the high-energy scattering approximation. In this framework the STSA originates from the q → q G splitting in the projectile (proton) light-cone wave function followed by a perturbative (C-odd) odderon interaction, together with a C-even interaction, between the projectile and the target. We show that some aspects of the obtained expression for the STSA of the produced quarks are in qualitative agreement with experiment: STSA decreases with decreasing projectile xF and is a non-monotonic function of the transverse momentum kT . In our framework the STSA peaks at kT near the saturation scale Qs. Our mechanism predicts that the quark STSA in proton-nucleus collisions should be much smaller than in proton-proton collisions. We also observe that in our formalism the STSA for prompt photons is zero.

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Comparison of spin asymmetries and cross sections in π0 production by 200 GeV polarized antiprotons and protons

Cited by 228 publications

References 11 publications

Azimuthal and single spin asymmetries in hard scattering processes

Azimuthal and single spin asymmetries in hard scattering processes

Transverse single-spin asymmetries inp↑p→γXfrom quark-gluon-quark correlations in the proton

A New Mechanism for Generating a Single Transverse Spin Asymmetry

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