Polarization in inclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>production at large<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>p</mml:mi></mml:mrow>

Lundberg, B.; Handler, R.; Pondrom, L.; Sheaff, M.; Wilkinson, C.; Dworkin, J.; Overseth, O. E.; Rameika, R.; Heller, K.; James, C.; Beretvas, A.; Cushman, P.; Devlin, T.; Luk, Kam Biu; Thomson, G. B.; Whitman, R.

doi:10.1103/physrevd.40.3557

Cited by 91 publications

(67 citation statements)

References 57 publications

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“…in pN reactions at 450 GeV at CERN-SPS [36]). Any larger phase-space coverage implied a time-consuming setting of the corresponding spectrometer to different scattering angles with proper relative normalization as tried at Fermilab in p (400 GeV) collisions on Be, Cu, and Pb targets with the main focus on the behaviour of the Λ andΛ polarization at large transverse momentum [37]. The first exclusive measurements of the Λ polarization were performed with the E766 experiment at the AGS in pp → K + Λ(π + π − ) n (n=1-4) at 27.5 GeV/c [38,39].…”

Section: Introductionmentioning

confidence: 99%

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Agakishiev¹,

Arnold²,

Bałanda³

et al. 2014

Eur. Phys. J. A

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Abstract. Results on Λ hyperon production are reported for collisions of p (3.5 GeV) + Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. The transverse mass distributions in rapidity bins are well described by Boltzmann shapes with a maximum inverse slope parameter of about 90 MeV at a rapidity of y = 1.0, i.e. slightly below the center-of-mass rapidity for nucleonnucleon collisions, ycm = 1.12. The rapidity density decreases monotonically with increasing rapidity within a rapidity window ranging from 0.3 to 1.3. The Λ phase-space distribution is compared with results of other experiments and with predictions of two transport approaches which are available publicly. None of the present versions of the employed models is able to fully reproduce the experimental distributions, i.e. in absolute yield and in shape. Presumably, this finding results from an insufficient modelling in the transport models of the elementary processes being relevant for Λ production, rescattering and absorption. The present high-statistics data allow for a genuine two-dimensional investigation as a function of phase space of the self-analyzing Λ polarization in the weak decay Λ → pπ − . Finite negative values of the polarization in the order of 5 − 20 % are observed over the entire phase space studied. The absolute value of the polarization increases almost linearly with increasing transverse momentum for pt > 300 MeV/c and increases with decreasing rapidity for y < 0.8. PACS.25.75.Dw, 25.75.Gz

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Section: Introductionmentioning

confidence: 99%

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Agakishiev¹,

Arnold²,

Bałanda³

et al. 2014

Eur. Phys. J. A

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“…Nevertheless, we figure out that the NN background can be neglected also for particle. Indeed, experimental observations show that 's polarization scales with x F ≡ 2p/ √ s [16], being p its momentum in the NN center-of-mass frame and that its magnitude strongly increases with x F [17]. At very low x F , where our calculation is performed (with y < 1 and p T up to 6 GeV, at the LHC energy scale of 1 TeV we have x F 0.07), the observed trend [18] indicates an approximate (generous) maximal polarization of 5% for p T up to few GeVs.…”

Section: Resultsmentioning

confidence: 99%

Λpolarization in peripheral heavy ion collisions

2013

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We predict the polarization of and¯ hyperons in peripheral heavy ion collisions at ultrarelativistic energy, based on the assumption of local thermodynamical equilibrium at the freeze-out. The polarization vector is proportional to the curl of the inverse temperature four-vector field and its length, of the order of percents, is maximal for a particle with moderately high momentum lying on the reaction plane. A selective measurement of these particles could make polarization detectable.

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“…3 we show our best fit results for PΛ as a function of p T for different x F values: in this case all data [13,15] are compatible with zero.…”

Section: Numerical Fits and Resultsmentioning

confidence: 99%

Lambda polarization in unpolarized hadron reactions

et al. 2001

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Abstract:The transverse polarization observed in the inclusive production of Λ hyperons in the high energy collisions of unpolarized hadrons is tackled by considering a new set of spin and k ⊥ dependent quark fragmentation functions. Simple phenomenological expressions for these new "polarizing fragmentation functions" are obtained by a fit of the data on Λ's andΛ's produced in p − N processes.

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Polarization in inclusiveΛandΛ¯production at largep

Cited by 91 publications

References 57 publications

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Lambda hyperon production and polarization in collisions of p(3.5 GeV)+Nb

Λpolarization in peripheral heavy ion collisions

Lambda polarization in unpolarized hadron reactions

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