Analyzing power in inclusive π+ and π− production at high x with a 200 GeV polarized proton beam

Adams, T.; Akchurin, N.; Belikov, N.I.; Bonner, B. E.; Buchanan, J.A.; Bystrický, J.; Clement, J.M.; 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.; Langland, J.; 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.; Phillips, G.C.; 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.; Stanek, R. W.; 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)90378-4

Cited by 340 publications

(159 citation statements)

References 32 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%

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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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show abstract

“…In the 1990's, the E581 and E704 collaborations at Fermilab reported data on hadron production in transversely polarized proton-proton scattering that showed large unanticipated transverse spin asymmetries of up to 30-40% [2][3][4][5][6][7]. Qualitatively, the asymmetries were consistent with zero for mid rapidities, but increased rapidly in the forward a kovchegov.1@asc.ohio-state.edu b sievert.7@osu.edu A N vs k T for π 0 Production (STAR 2008) FIG.…”

Section: Introductionmentioning

confidence: 99%

“…2. Experimental data on the pion single transverse spin asymmetry AN as a function of Feynman-x reported by E581 and E704 collaborations (graphically reconstructed from [3], shown in the left panel) for 0.7 ≤ kT ≤ 2.0 GeV/c, and as a function of the pion transverse momentum kT collected by the STAR collaboration [12] (right panel).…”

Section: Introductionmentioning

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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Recent progress in the understanding of single spin asymmetries

Metz¹,

Schlegel²

2004

Ann. Phys.

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Dedicated to Klaus Goeke on the occasion of his 60th birthday.Over the past years a lot of progress has been made in the understanding of single spin asymmetries in hard scattering processes. We briefly review this subject, covering the non-vanishing of time-reversal odd parton distributions, universality of fragmentation functions, and the discovery of previously unknown timereversal odd parton distributions at subleading twist. Interestingly enough, all these developments were initiated by simple model calculations.

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Analyzing power in inclusive π+ and π− production at high x with a 200 GeV polarized proton beam

Cited by 340 publications

References 32 publications

Azimuthal and single spin asymmetries in hard scattering processes

Azimuthal and single spin asymmetries in hard scattering processes

A New Mechanism for Generating a Single Transverse Spin Asymmetry

Recent progress in the understanding of single spin asymmetries

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