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Forward-backward multiplicity correlations in pp collisions at root s=0.9, 2.76 and 7 TeV

Adam, J.; Adamova, D.; Aggarwal, M. M.; Rinella, G. Aglieri; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmed, I.; Ahn, S. U. and Aimo, I., et al. (2015) In Journal of High Energy Physics
Abstract
The strength of forward-backward (FB) multiplicity correlations is measured by the ALICE detector in proton-proton (pp) collisions at = 0.9, 2.76 and 7 TeV. The measurement is performed in the central pseudorapidity region (|eta| < 0.8) for the transverse momentum p (T) > 0.3 GeV/c. Two separate pseudorapidity windows of width (delta eta) ranging from 0.2 to 0.8 are chosen symmetrically around eta = 0. The multiplicity correlation strength (b (corr)) is studied as a function of the pseudorapidity gap (eta (gap)) between the two windows as well as the width of these windows. The correlation strength is found to decrease with increasing eta (gap) and shows a non-linear increase with delta eta. A sizable increase of the correlation... (More)
The strength of forward-backward (FB) multiplicity correlations is measured by the ALICE detector in proton-proton (pp) collisions at = 0.9, 2.76 and 7 TeV. The measurement is performed in the central pseudorapidity region (|eta| < 0.8) for the transverse momentum p (T) > 0.3 GeV/c. Two separate pseudorapidity windows of width (delta eta) ranging from 0.2 to 0.8 are chosen symmetrically around eta = 0. The multiplicity correlation strength (b (corr)) is studied as a function of the pseudorapidity gap (eta (gap)) between the two windows as well as the width of these windows. The correlation strength is found to decrease with increasing eta (gap) and shows a non-linear increase with delta eta. A sizable increase of the correlation strength with the collision energy, which cannot be explained exclusively by the increase of the mean multiplicity inside the windows, is observed. The correlation coefficient is also measured for multiplicities in different configurations of two azimuthal sectors selected within the symmetric FB eta-windows. Two different contributions, the short-range (SR) and the long-range (LR), are observed. The energy dependence of b (corr) is found to be weak for the SR component while it is strong for the LR component. Moreover, the correlation coefficient is studied for particles belonging to various transverse momentum intervals chosen to have the same mean multiplicity. Both SR and LR contributions to b (corr) are found to increase with p (T) in this case. Results are compared to PYTHIA and PHOJET event generators and to a string-based phenomenological model. The observed dependencies of b (corr) add new constraints on phenomenological models. (Less)
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Journal of High Energy Physics
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  • scopus:84930225537
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1126-6708
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10.1007/JHEP05(2015)097
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@article{d149b245-d9ae-413f-9462-89ba23227f6e,
  abstract     = {The strength of forward-backward (FB) multiplicity correlations is measured by the ALICE detector in proton-proton (pp) collisions at = 0.9, 2.76 and 7 TeV. The measurement is performed in the central pseudorapidity region (|eta| &lt; 0.8) for the transverse momentum p (T) &gt; 0.3 GeV/c. Two separate pseudorapidity windows of width (delta eta) ranging from 0.2 to 0.8 are chosen symmetrically around eta = 0. The multiplicity correlation strength (b (corr)) is studied as a function of the pseudorapidity gap (eta (gap)) between the two windows as well as the width of these windows. The correlation strength is found to decrease with increasing eta (gap) and shows a non-linear increase with delta eta. A sizable increase of the correlation strength with the collision energy, which cannot be explained exclusively by the increase of the mean multiplicity inside the windows, is observed. The correlation coefficient is also measured for multiplicities in different configurations of two azimuthal sectors selected within the symmetric FB eta-windows. Two different contributions, the short-range (SR) and the long-range (LR), are observed. The energy dependence of b (corr) is found to be weak for the SR component while it is strong for the LR component. Moreover, the correlation coefficient is studied for particles belonging to various transverse momentum intervals chosen to have the same mean multiplicity. Both SR and LR contributions to b (corr) are found to increase with p (T) in this case. Results are compared to PYTHIA and PHOJET event generators and to a string-based phenomenological model. The observed dependencies of b (corr) add new constraints on phenomenological models.},
  articleno    = {097},
  author       = {Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. Aglieri and Agnello, M. and Agrawal, N. and Ahammed, Z. and Ahmed, I. and Ahn, S. U. and Aimo, I. and Aiola, S. and Ajaz, M. and Akindinov, A. and Alam, S. N. and Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Alfaro Molina, R. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altinpinar, S. and Altsybeev, I. and Alves Garcia Prado, C. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Anticic, T. and Antinori, F. and Antonioli, P. and Aphecetche, L. and Appelshaeuser, H. and Arcelli, S. and Armesto, N. and Arnaldi, R. and Aronsson, T. and Arsene, I. C. and Arslandok, M. and Augustinus, A. and Averbeck, R. and Azmi, M. D. and Bach, M. and Badala, A. and Baek, Y. W. and Bagnasco, S. and Bailhache, R. and Bala, R. and Baldisseri, A. and Ball, M. and Pedrosa, F. Baltasar Dos Santos and Baral, R. C. and Barbano, A. M. and Barbera, R. and Barile, F. and Barnafoeldi, G. G. and Barnby, L. S. and Barret, V. and Bartalini, P. and Bartke, J. and Bartsch, E. and Basile, M. and Bastid, N. and Basu, S. and Bathen, B. and Batigne, G. and Camejo, A. Batista and Batyunya, B. and Batzing, P. C. 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 Belmont, R. and Belmont-Moreno, E. and Belyaev, V. and Bencedi, G. and Beole, S. and Berceanu, I. and Bercuci, A. and Berdnikov, Y. and Berenyi, D. and Bertens, R. A. and Berzano, D. and Betev, L. and Bhasin, A. and Bhat, I. R. and Bhati, A. K. and Bhattacharjee, B. and Bhom, J. and Bianchi, L. and Bianchi, N. and Bianchin, C. and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and Biswas, S. and Bjelogrlic, S. and Blanco, F. and Blau, D. and Blume, C. and Bock, F. and Bogdanov, A. and Boggild, H. and Boldizsar, L. and Bombara, M. and Book, J. and Borel, H. and Borissov, A. and Borri, M. and Bossu, F. and Botje, M. and Botta, E. and Boettger, S. and Braun-Munzinger, P. and Bregant, M. and Breitner, T. and Broker, T. A. and Browning, 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 Buncic, P. and Busch, O. and Buthelezi, Z. and Buxton, J. T. and Caffarri, D. and Cai, X. and Caines, H. and Diaz, L. Calero and Caliva, A. and Calvo Villar, E. and Camerini, P. and Carena, F. and Carena, W. and Castellanos, J. Castillo and Castro, A. J. and Casula, E. A. R. and Cavicchioli, C. and Ceballos Sanchez, C. and Cepila, J. and Cerello, P. and Chang, B. and Chapeland, S. and Chartier, M. and Charvet, J. L. and Chattopadhyay, S. and Chattopadhyay, S. and Chelnokov, V. and Cherney, M. and Cheshkov, C. and Cheynis, B. and Barroso, V. Chibante and Chinellato, D. D. and Chochula, P. and Choi, K. and Chojnacki, M. and Choudhury, S. and Christakoglou, P. and Christensen, C. H. and Christiansen, Peter and Chujo, T. and Chung, S. U. and Cicalo, C. and Cifarelli, L. and Cindolo, F. and Cleymans, J. and Colamaria, F. and Colella, D. and Collu, A. and Colocci, M. and Balbastre, G. Conesa and del Valle, Z. Conesa and Connors, M. E. and Contreras, J. G. and Cormier, T. M. and Morales, Y. Corrales and Cortes Maldonado, I. and Cortese, P. and Cosentino, M. R. and Costa, F. and Crochet, P. and Cruz Albino, R. and Cuautle, E. and Cunqueiro, L. and Dahms, T. and Dainese, A. and Danu, A. and Das, D. and Das, I. and Das, S. and Dash, A. and Dash, S. and De, S. and De Caro, A. and de Cataldo, G. and de Cuveland, J. and De Falco, A. and De Gruttola, D. and De Marco, N. and De Pasquale, S. and Deloff, A. and Denes, E. and D'Erasmo, G. and Di Bari, D. and Di Mauro, A. and Di Nezza, P. and Corchero, M. A. Diaz and Dietel, T. and Dillenseger, P. and Divia, R. and Djuvsland, O. and Dobrin, A. and Dobrowolski, T. and Domenicis Gimenez, D. and Doenigus, B. and Dordic, O. and Dubey, A. K. and Dubla, A. and Ducroux, L. and Dupieux, P. and Ehlers, R. J. and Elia, D. and Engel, H. and Erazmus, B. and Erdal, H. A. and Eschweiler, D. and Espagnon, B. and Esposito, M. and Estienne, M. and Esumi, S. and Evans, D. and Evdokimov, S. and Eyyubova, G. and Fabbietti, L. and Fabris, D. and Faivre, J. and Fantoni, A. and Fasel, M. and Feldkamp, L. and Felea, D. and Feliciello, A. and Feofilov, G. and Ferencei, J. and Fernandez Tellez, A. and Ferreiro, E. G. and Ferretti, A. and Festanti, A. and Figiel, J. and Figueredo, M. A. S. and Filchagin, S. and Finogeev, D. and Fionda, F. M. and Fiore, E. M. and Fleck, M. G. and Floris, M. and Foertsch, S. and Foka, P. and Fokin, S. and Fragiacomo, E. and Francescon, A. and Frankenfeld, U. and Fuchs, U. and Furget, C. and Furs, A. and Girard, M. Fusco and Gaardhoje, J. J. and Gagliardi, M. and Gago, A. M. and Gallio, M. and Gangadharan, D. R. and Ganoti, P. and Gao, C. and Garabatos, C. and Garcia-Solis, E. and Gargiulo, C. and Gasik, P. and Germain, M. and Gheata, A. and Gheata, M. and Ghidini, B. and Ghosh, P. and Ghosh, S. K. and Gianotti, P. and Giubellino, P. and Giubilato, P. and Gladysz-Dziadus, E. and Glaessel, P. and Ramirez, A. Gomez and Gonzalez-Zamora, P. and Gorbunov, S. and Goerlich, L. and Gotovac, S. and Grabski, V. and Graczykowski, L. K. and Grelli, A. and Grigoras, A. and Grigoras, C. and Grigoriev, V. and Grigoryan, A. and Grigoryan, S. and Grinyov, B. and Grion, N. and Grosse-Oetringhaus, J. F. and Grossiord, J. -Y. and Grosso, R. and Guber, F. and Guernane, R. and Guerzoni, B. and Gulbrandsen, K. and Gulkanyan, H. and Gunji, T. and Gupta, A. and Gupta, R. and Haake, R. and Haaland, O. and Hadjidakis, C. and Haiduc, M. and Hamagaki, H. and Hamar, G. and Hanratty, L. D. and Hansen, A. and Harris, J. W. and Hartmann, H. and Harton, A. and Hatzifotiadou, D. and Hayashi, S. and Heckel, S. T. and Heide, M. and Helstrup, H. and Herghelegiu, A. and Herrera Corral, G. and Hess, B. A. and Hetland, K. F. and Hilden, T. E. and Hillemanns, H. and Hippolyte, B. and Hristov, P. and Huang, M. and Humanic, T. J. and Hussain, N. and Hussain, T. and Hutter, D. and Hwang, D. S. and Ilkaev, R. and Ilkiv, I. and Inaba, M. and Ionita, C. and Ippolitov, M. and Irfan, M. and Ivanov, M. and Ivanov, V. and Jacholkowski, A. and Jacobs, P. M. and Jahnke, C. and Jang, H. J. and Janik, M. A. and Jayarathna, P. H. S. Y. and Jena, C. and Jena, S. and Jimenez Bustamante, R. T. and Jones, P. G. and Jung, H. and Jusko, A. and Kalinak, P. and Kalweit, A. and Kamin, J. and Kang, J. H. and Kaplin, V. and Kar, S. and Uysal, A. Karasu and Karavichev, O. and Karavicheva, T. and Karpechev, E. and Kebschull, U. and Keidel, R. and Keijdener, D. L. D. and Keil, M. and Khan, K. H. and Khan, M. M. and Khan, P. and Khan, S. A. and Khanzadeev, A. and Kharlov, Y. and Kileng, B. and Kim, B. and Kim, D. W. and Kim, D. J. and Kim, H. and Kim, J. S. and Kim, M. and Kim, M. and Kim, S. and Kim, T. and Kirsch, S. and Kisel, I. and Kiselev, S. and Kisiel, A. and Kiss, G. and Klay, J. L. and Klein, C. and Klein, J. and Klein-Boesing, C. and Kluge, A. and Knichel, M. L. and Knospe, A. G. and Kobayashi, T. and Kobdaj, C. and Kofarago, M. and Koehler, M. K. and Kollegger, T. and Kolojvari, A. and Kondratiev, V. and Kondratyeva, N. and Kondratyuk, E. and Konevskikh, A. and Kovalenko, V. and Kowalski, M. and Kox, S. and Meethaleveedu, G. Koyithatta and Kral, J. and Kralik, I. and Kravcakova, A. and Krelina, M. and Kretz, M. and Krivda, M. and Krizek, F. and Kryshen, E. and Krzewicki, M. and Kubera, A. M. and Kucera, V. and Kucheriaev, Y. and Kugathasan, T. and Kuhn, C. and Kuijer, P. G. and Kulakov, I. and Kumar, J. and Kumar, L. and Kurashvili, P. and Kurepin, A. and Kurepin, A. B. and Kuryakin, A. and Kushpil, S. and Kweon, M. J. and Kwon, Y. and La Pointe, S. 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B. and Zinovjev, G. and Zyzak, M.},
  issn         = {1126-6708},
  keyword      = {Hadron-Hadron Scattering},
  language     = {eng},
  number       = {5},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Forward-backward multiplicity correlations in pp collisions at root s=0.9, 2.76 and 7 TeV},
  url          = {http://dx.doi.org/10.1007/JHEP05(2015)097},
  year         = {2015},
}