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dc.contributor.authorAcharya, S. and Acosta, F. T. and Adamova, D. and Adler, A. and Adolfsson, J. and Aggarwal, M. M. and Rinella, G. Aglieri and Agnello, M. and Agrawal, N. and Ahammed, Z. and Ahn, S. U. and Aiola, S. and Akindinov, A. and Al-Turany, M. and Alam, S. N. and Albuquerque, D. S. D. and Aleksandrov, D. and Alessandro, B. and Alfanda, H. M. and Alfaro Molina, R. and Ali, Y. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altenkamper, L. and Altsybeev, I and Anaam, M. N. and Andrei, C. and Andreou, D. and Andrews, H. A. and Andronic, A. and Angeletti, M. and Anguelov, V and Anson, C. and Anticic, T. and Antinori, F. and Antonioli, P. and Anwar, R. and Apadula, N. and Aphecetche, L. and Appelshaeuser, H. and Arcelli, S. and Arnaldi, R. and Arsene, I. C. and Arslandok, M. and Augustinus, A. and Averbeck, R. and Azmi, M. D. and Badal, A. and Baek, Y. W. and Bagnasco, S. and Bailhache, R. and Bala, R. and Baldisseri, A. and Ball, M. and Baral, R. C. and Barbano, A. M. and Barbera, R. and Barile, F. and Barioglio, L. and Barnafoldi, G. G. and Barnby, L. S. and Barret, V and Bartalini, P. and Barth, K. and Bartsch, E. and Bastid, N. and Basu, S. and Batigne, G. and Batyunya, B. and Batzing, P. C. and Alba, J. L. Bazo and Bearden, I. G. and Beck, H. and Bedda, C. and Behera, N. K. and Belikov, I and Bellini, F. and Martinez, H. Bello and Bellwied, R. and Beltran, L. G. E. and Belyaev, V and Bencedi, G. and Beole, S. and Bercuci, A. and Berdnikov, Y. and Berenyi, D. and Bertens, R. A. and Berzano, D. and Betev, L. and Bhaduri, P. P. and Bhasin, A. and Bhat, I. R. and Bhatt, H. and Bhattacharjee, B. and Bhom, J. and Bianchi, A. and Bianchi, L. and Bianchi, N. and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and Biro, G. and Biswas, R. and Biswas, S. and Blair, J. T. and Blau, D. and Blume, C. and Boca, G. and Bock, F. and Bogdanov, A. and Boldizsar, L. and Bolozdynya, A. and Bombara, M. and Bonomi, G. and Bonora, M. and Borel, H. and Borissov, A. and Borri, M. and Botta, E. and Bourjau, C. and Bratrud, L. and Braun-Munzinger, P. and Bregant, M. and Broker, T. A. and Broz, M. and Brucken, E. J. and Bruna, E. and Bruno, G. E. and Budnikov, D. and Buesching, H. and Bufalino, S. and Buhler, P. and Buncic, P. and Busch, O. and Buthelezi, Z. and Butt, J. B. and Buxton, J. T. and Cabala, J. and Caffarri, D. and Caines, H. and Caliva, A. and Calvo Villar, E. and Camacho, R. S. and Camerini, P. and Capon, A. A. and Carena, W. and Carnesecchi, F. and Castellanos, J. Castillo and Castro, A. J. and Casula, E. A. R. and Ceballos Sanchez, C. and Chandra, S. and Chang, B. and Chang, W. and Chapeland, S. and Chartier, M. and Chattopadhyay, S. and Chattopadhyay, S. and Chauvin, A. and Cheshkov, C. and Cheynis, B. and Barroso, V. Chibante and Chinellato, D. 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C. and Zardoshti, N. and Zarochentsev, A. and Zavada, P. and Zaviyalov, N. and Zbroszczyk, H. and Zhalov, M. and Zhang, X. and Zhang, Y. and Zhang, Z. and Zhao, C. and Zherebchevskii, V and Zhigareva, N. and Zhou, D. and Zhou, Y. and Zhou, Z. and Zhu, H. and Zhu, J. and Zhu, Y. and Zichichi, A. and Zimmermann, M. B. and Zinovjev, G. and Zmeskal, J. and ALICE Collaboration
dc.description.abstractComprehensive results on the production of unidentified charged particles, pi(+/-), K-+/-, K-s(0), K{*}(892)(0), p, (p) over bar, phi(1020), Lambda, (Lambda) over bar, Xi(-) , (Xi) over bar (+), Omega(-), and (Omega) over bar (+) hadrons in proton-proton (pp) collisions at root s = 7 TeV at midrapidity (vertical bar y vertical bar < 0.5) as a function of charged-particle multiplicity density are presented. In order to avoid autocorrelation biases, the actual transverse momentum (p(T)) spectra of the particles under study and the event activity are measured in different rapidity windows. In the highest multiplicity class, the charged-particle density reaches about 3.5 times the value measured in inelastic collisions. While the yield of protons normalized to pions remains approximately constant as a function of multiplicity, the corresponding ratios of strange hadrons to pions show a significant enhancement that increases with increasing strangeness content. Furthermore, all identified particleto-pion ratios are shown to depend solely on charged-particle multiplicity density, regardless of system type and collision energy. The evolution of the spectral shapes with multiplicity and hadron mass shows patterns that are similar to those observed in p-Pb and Pb-Pb collisions at Large Hadron Collider energies. The obtained p(T), distributions and yields are compared to expectations from QCD-based pp event generators as well as to predictions from thermal and hydrodynamic models. These comparisons indicate that traces of a collective, equilibrated system are already present in high-multiplicity pp collisions.
dc.titleMultiplicity dependence of light-flavor hadron production in pp collisions at root s=7 TeV

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