The transverse polarization ofΛand ̄Λhyperons produced in proton-proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses760μb−1of minimum bias data collected by theATLAS detector at the LHC in the year 2010. The measured transverse polarization averaged overFeynmanxFfrom5×10−5to 0.01 and transverse momentumpTfrom 0.8 to 15 GeV is−0.0100.005ðstatÞ0.004ðsystÞforΛand0.0020.006ðstatÞ0.004ðsystÞfor ̄Λ. It is also measured as afunction ofxFandpT, but no significant dependence on these variables is observed. Prior to thismeasurement, the polarization was measured at fixed-target experiments with center-of-mass energies upto about 40 GeV. The ATLAS results are compatible with the extrapolation of a fit from previousmeasurements to thexFrange covered by this measurement.

Measurement of the transverse polarization of Lambda and (Lambda)over-bar hyperons produced in proton-proton collisions at root s=7 TeV using the ATLAS detector / Aad, G., Abbott, B., Abdallah, J., Khalek, S.A., Abdinov, O., Aben, R., Abi, B., Abolins, M., Abouzeid, O.S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B.S., Adamczyk, L., Adams, D.L., Adelman, J., Adomeit, S., Adye, T., Agatonovic Jovin, T., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 91:3(2015). [10.1103/PhysRevD.91.032004]

Measurement of the transverse polarization of Lambda and (Lambda)over-bar hyperons produced in proton-proton collisions at root s=7 TeV using the ATLAS detector

Artoni, G.;BAGNAIA, Paolo;BINI, Cesare;DE CECCO, Sandro;DI DOMENICO, Antonio;GAUZZI, Paolo;GENTILE, Simonetta;GIAGU, Stefano;Kado, M.;LACAVA, Francesco;LUCI, Claudio;MESSINA, Andrea;Policicchio, A.;
2015

Abstract

The transverse polarization ofΛand ̄Λhyperons produced in proton-proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses760μb−1of minimum bias data collected by theATLAS detector at the LHC in the year 2010. The measured transverse polarization averaged overFeynmanxFfrom5×10−5to 0.01 and transverse momentumpTfrom 0.8 to 15 GeV is−0.0100.005ðstatÞ0.004ðsystÞforΛand0.0020.006ðstatÞ0.004ðsystÞfor ̄Λ. It is also measured as afunction ofxFandpT, but no significant dependence on these variables is observed. Prior to thismeasurement, the polarization was measured at fixed-target experiments with center-of-mass energies upto about 40 GeV. The ATLAS results are compatible with the extrapolation of a fit from previousmeasurements to thexFrange covered by this measurement.
2015
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01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the transverse polarization of Lambda and (Lambda)over-bar hyperons produced in proton-proton collisions at root s=7 TeV using the ATLAS detector / Aad, G., Abbott, B., Abdallah, J., Khalek, S.A., Abdinov, O., Aben, R., Abi, B., Abolins, M., Abouzeid, O.S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B.S., Adamczyk, L., Adams, D.L., Adelman, J., Adomeit, S., Adye, T., Agatonovic Jovin, T., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 91:3(2015). [10.1103/PhysRevD.91.032004]
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