Strange particle production in proton-proton collisions at $\sqrt{s}$ = 0.9 TeV with ALICE at the LHC

The production of mesons containing strange quarks ($\Kzs$, $\phi$) and both singly and doubly strange baryons ($\rmLambda$, $\rmAlambda$, and $\Xis$) are measured at central rapidity in pp collisions at $\sqrt{s}$ = 0.9 $\tev$ with the ALICE experiment at the LHC. The results are obtained from the...

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Published in:The European physical journal. C, Particles and fields Particles and fields, 2011, Vol.71
Main Authors: Aamodt, K., Abrahantes Quintana, A., Adamova, D., Adare, A.M., Aggarwal, M.M., Aglieri Rinella, G., Agocs, A.G., Aguilar Salazar, S., Ahammed, Z., Ahmad, N., Ahmad Masoodi, A., Ahn, Sang Un, Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., Alkin, A., Almaraz Avina, E., Alt, T., Altini, V., Altinpinar, S., Altsybeev, I., Andrei, C., Andronic, A., Anguelov, V., Anson, C., Anticic, T., Antinori, F., Antonioli, P., Aphecetche, Laurent, Appelshäuser, H., Arbor, N., Arcelli, S., Arend, A., Armesto, N., Arnaldi, R., Aronsson, T., Arsene, I.C., Asryan, A., Augustinus, A., Averbeck, R., Awes, T.C., Aystö, J., Azmi, M.D., Bach, M., Badala, A., Baek, Y.W., Bagnasco, S., Bailhache, R., Bala, R., Baldini Ferroli, R., Baldisseri, A., Baldit, A., Ban, J., Barbera, R., Barile, F., Barnaföldi, G.G., Barnby, L.S., Barret, V., Bartke, J., Basile, M., Bastid, N., Bathen, B., Batigne, Guillaume, Batyunya, B., Baumann, Cédric, Bearden, I.G., Beck, H., Belikov, I., Bellini, F., Bellwied, R., Belmont-Moreno, E., Beole, S., Berceanu, I., Bercuci, A., Berdermann, E., Berdnikov, Y., Betev, L., Bhasin, A., Bhati, A.K., Bianchi, L., Bianchi, N., Bianchin, C., Bielcik, J., Bielcikova, J., Bilandzic, A., Biolcati, E., Blanc, A., Blanco, F., Blau, D., Blume, C., Boccioli, M., Bock, N., Bogdanov, A., Bøggild, H., Bogolyubsky, M., Boldizsar, L., Bombara, M., Bombonati, C.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
Physics
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Summary:The production of mesons containing strange quarks ($\Kzs$, $\phi$) and both singly and doubly strange baryons ($\rmLambda$, $\rmAlambda$, and $\Xis$) are measured at central rapidity in pp collisions at $\sqrt{s}$ = 0.9 $\tev$ with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias events recorded in 2009. Measurements of yields (dN/dy) and transverse momentum spectra at central rapidities for inelastic pp collisions are presented. For mesons, we report yields ($< \dNdy >$) of $0.184 \pm 0.002 \stat \pm 0.006 \syst$ for $\Kzs$ and $0.021 \pm 0.004 \stat \pm 0.003 \syst$ for $\phi$. For baryons, we find $< \dNdy > = 0.048 \pm 0.001 \stat \pm 0.004 \syst$ for $\rmLambda$, $0.047 \pm 0.002 \stat \pm 0.005 \syst$ for $\rmAlambda$ and $0.0101 \pm 0.0020 \stat \pm 0.0009 \syst$ for $\Xis$. The results are also compared with predictions for identified particle spectra from QCD-inspired models and provide a baseline for comparisons with both future pp measurements at higher energies and heavy-ion collisions.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-011-1594-5