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86 results on '"Sapeta, S."'

51. KrkNLO in Herwig 7

Author

Jadach, S., primary, Nail, G., additional, Płaczek, W., additional, Sapeta, S., additional, Siódmok, A., additional, and Skrzypek, M., additional

Published
2017
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53. Forward di-jet production in p+Pb collisions in the small-x improved TMD factorization framework

Author

Hameren, A. van, Kotko, P., Kutak, K., Marquet, C., Petreska, E., Sapeta, S., Hameren, A. van, Kotko, P., Kutak, K., Marquet, C., Petreska, E., and Sapeta, S.

Abstract

We study the production of forward di-jets in proton-lead and proton-proton collisions at the Large Hadron Collider. Such configurations, with both jets produced in the forward direction, impose a dilute-dense asymmetry which allows to probe the gluon density of the lead or proton target at small longitudinal momentum fractions. Even though the jet momenta are always much bigger than the saturation scale of the target, Q(s), the transverse momentum imbalance of the di-jet system may be either also much larger than Q(s), or of the order Q(s), implying that the small-x QCD dynamics involved is either linear or non-linear, respectively. The small-x improved TMD factorization framework deals with both situations in the same formalism. In the latter case, which corresponds to nearly back-to-back jets, we find that saturation effects induce a significant suppression of the forward di-jet azimuthal correlations in proton-lead versus proton-proton collisions.

Published
2016
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54. Forward di-jet production in dilute-dense collisions

Author

Universidade de Santiago de Compostela. Departamento de Física de Partículas, Petreska, Elena, Kotko, P., Kutak, K., Marquet, C., Sapeta, S., Van Hameren, A., Universidade de Santiago de Compostela. Departamento de Física de Partículas, Petreska, Elena, Kotko, P., Kutak, K., Marquet, C., Sapeta, S., and Van Hameren, A.

Abstract

We derive a factorization formula for forward production of two jets in dilutedense collisions that is valid for an arbitrary value of the momentum imbalance of the jets, kt. This generalizes the transverse momentum dependent (TMD) factorization formula that has been derived before by Dominguez et al. Their formula is valid only for small values of the transverse momentum of the small-x gluon from the target; it has kt dependent TMD gluon distributions, but on-shell hard matrix elements. We extend the TMD formula to all ranges of kt by including off-shell matrix elements. We also add finite Nc corrections. The new formula encompasses both, the TMD factorization for small kt on the order of the saturation scale, and the High Energy Factorization (HEF) for large kt on the order of the momentum of the jets. The TMD and HEF factorizations can be derived from the Color Glass Condensate (CGC) formula for forward di-jet production in the appropriate limits. We show explicitly the equivalence of HEF and CGC in the dilute target approximation.

Published
2016

55. Forward di-jet production in p+Pb collisions in the small-x improved TMD factorization framework

Author

Universidade de Santiago de Compostela. Departamento de Física de Partículas, Van Hameren, A., Kotko, P., Kutak, K., Marquet, C., Petreska, Elena, Sapeta, S., Universidade de Santiago de Compostela. Departamento de Física de Partículas, Van Hameren, A., Kotko, P., Kutak, K., Marquet, C., Petreska, Elena, and Sapeta, S.

Abstract

We study the production of forward di-jets in proton-lead and proton-proton collisions at the Large Hadron Collider. Such configurations, with both jets produced in the forward direction, impose a dilute-dense asymmetry which allows to probe the gluon density of the lead or proton target at small longitudinal momentum fractions. Even though the jet momenta are always much bigger than the saturation scale of the target, Q s, the transverse momentum imbalance of the di-jet system may be either also much larger than Q s, or of the order Q s, implying that the small-x QCD dynamics involved is either linear or non-linear, respectively. The small-x improved TMD factorization framework deals with both situations in the same formalism. In the latter case, which corresponds to nearly back-to-back jets, we find that saturation effects induce a significant suppression of the forward di-jet azimuthal correlations in proton-lead versus proton-proton collisions

Published
2016

58. Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions

Author

Universidade de Santiago de Compostela. Departamento de Física de Partículas, Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE), Kotko, P., Kutak, K., Marquet, C., Petreska, Elena, Sapeta, S., Van Hameren, A., Universidade de Santiago de Compostela. Departamento de Física de Partículas, Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE), Kotko, P., Kutak, K., Marquet, C., Petreska, Elena, Sapeta, S., and Van Hameren, A.

Abstract

We study forward dijet production in dilute-dense hadronic collisions. By considering the appropriate limits, we show that both the transverse-momentum-dependent (TMD) and the high-energy factorization formulas can be derived from the Color Glass Condensate framework. Respectively, this happens when the transverse momentum imbalance of the dijet system, kt , is of the order of either the saturation scale, or the hard jet momenta, the former being always much smaller than the latter. We propose a new formula for forward dijets that encompasses both situations and is therefore applicable regardless of the magnitude of kt . That involves generalizing the TMD factorization formula for dijet production to the case where the incoming small-x gluon is off-shell. The derivation is performed in two independent ways, using either Feynman diagram techniques, or color-ordered amplitudes.

Published
2015

59. Report of the Snowmass 2013 energy frontier QCD working group

Author

Campbell, J., Hatakeyama, K., Huston, J., Petriello, F., Andersen, J., Barze, L., Beauchemin, H., Becher, T., Begel, M., Blondel, A., Bodwin, G., Boughezal, R., Stefano Carrazza, Chiesa, M., Dissertori, G., Dittmaier, S., Giancarlo Ferrera, Stefano Forte, Glover, N., Hapola, T., Huss, A., Tormo, X., Grazzini, M., Hoche, S., Janot, P., Kasprzik, T., Klein, M., Klein, U., Kosower, D., Li, Y., Liu, X., Mackenzie, P., Maitre, D., Meoni, E., Mishra, K., Montagna, G., Moretti, M., Nadolsky, P., Nicrosini, O., Piccinini, F., Reina, L., Radescu, V., Rojo, J., Russ, J., Sapeta, S., Schwartzman, A., Skands, P., Smillie, J., Stewart, I., Tackmann, F., Tramontano, F., Water, R., Walsh, J., and Zuberi, S.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics::Phenomenology, FOS: Physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment
Abstract

This is the summary report of the energy frontier QCD working group prepared for Snowmass 2013. We review the status of tools, both theoretical and experimental, for understanding the strong interactions at colliders. We attempt to prioritize important directions that future developments should take. Most of the efforts of the QCD working group concentrate on proton-proton colliders, at 14 TeV as planned for the next run of the LHC, and for 33 and 100 TeV, possible energies of the colliders that will be necessary to carry on the physics program started at 14 TeV. We also examine QCD predictions and measurements at lepton-lepton and lepton-hadron colliders, and in particular their ability to improve our knowledge of strong coupling constant and parton distribution functions., 62 pages, 31 figures, Snowmass community summer study 2013

Published
2013

60. Predictions for p+pb collisions at √snn = 5 TeV

Author

Albacete, JL, Armesto, N, Baier, R, Barnaföldi, GG, Barrette, J, De, S, Deng, W-T, Dumitru, A, Dusling, K, Eskola, KJ, Fries, R, Fujii, H, Gelis, F, Gyulassy, M, He, Y, Helenius, I, Kang, Z-B, Kopeliovich, BZ, Kutak, K, Levai, P, Lin, Z-W, Mueller, AH, Nara, Y, Nemchik, J, Papp, G, Petrovici, M, Qiu, J-W, Rezaeian, AH, Ru, P, Schiff, D, Sapeta, S, Pop, VT, Tribedy, P, Venugopalan, R, Vitev, I, Vogt, R, Wang, E, Wang, X-N, Xing, H, Xu, R, Zhang, B-W, and Zhang, W-N

Published
2013

65. Proceedings, Workshop on Heavy Ion Collisions at the LHC: Last Call for Predictions: Geneva, Switzerland, May 14 - June 8, 2007

Author

Armesto, N., Borghini, N., Jeon, S., Wiedemann, U.A., Abreu, S., Akkelin, S.V., Alam, J., Albacete, J.L., Andronic, A., Antonov, D., Arleo, F., Arsene, I.C., Barnaföldi, G.G., Barrette, J., Bäuchle, B., Becattini, F., Betz, B., Bleicher, M., Bluhm, M., Boer, D., Bopp, F.W., Braun-Munzinger, P., Bravina, L., Busza, W., Cacciari, M., Capella, A., Casalderrey-Solana, J., Chatterjee, R., Chen, L-W, Cleymans, J., Cole, B.A., Conesa del Valle, Z., Csernai, L.P., Cunqueiro, L., Dainese, A., Dias de Deus, J., Ding, H-T, Djordjevic, M., Drescher, H., Dremin, I.M., Dumitru, A., El, A., Engel, R., d'Enterria, D., Eskola, K.J., Fai, G., Ferreiro, E.G., Fries, R.J., Frodermann, E., Fujii, H., Gale, C., Gelis, F., Gonçalves, V.P., Greco, V., Greiner, C., Gyulassy, M., van Hees, H., Heinz, U., Honkanen, H., Horowitz, W.A., Iancu, E., Ingelman, G., Jalilian-Marian, J., Kaidalov, A.B., Kämpfer, B., Kang, Z-B, Karpenko, Iu A., Kestin, G., Kharzeev, D., Ko, C.M., Koch, B., Kopeliovich, B., Kozlov, M., Kraus, I., Kuznetsova, I., Lee, S.H., Lednicky, R., Letessier, J., Levin, E., Li, B-A, Lin, Z-W, Liu, H., Liu, W., Loizides, C., Lokhtin, I.P., Machado, M. V T, Malinina, L.V., Managadze, A.M., Mangano, M.L., Mannarelli, M., Manuel, C., Martínez, G., Milhano, J.G., Mócsy, Á., Molnár, D., Nardi, M., Nayak, J.K., Niemi, H., Oeschler, H., Ollitrault, J-Y, Paić, G., Pajares, C., Pantuev, V.S., Papp, G., Peressounko, D., Petreczky, P., Petrushanko, S.V., Piccinini, F., Pierog, T., Pirner, H.J., Porteboeuf, S., Potashnikova, I., Qin, G.Y., Qiu, J-W, Rafelski, J., Rajagopal, K., Ranft, J., Rapp, R., Räsänen, S.S., Rathsman, J., Rau, P., Redlich, K., Renk, T., Rezaeian, A.H., Rischke, D., Roesler, S., Ruppert, J., Ruuskanen, P.V., Salgado, C.A., Sapeta, S., Sarcevic, I., Sarkar, S., Sarycheva, L.I., Schmidt, I., Shoshi, A.I., Sinha, B., Sinyukov, Yu M., Snigirev, A.M., Srivastava, D.K., Stachel, J., Stasto, A., Stöcker, H., Teplov, C. Yu, Thews, R.L., Torrieri, G., Topor Pop, V., Triantafyllopoulos, D.N., Tuchin, K.L., Turbide, S., Tywoniuk, K., Utermann, A., Venugopalan, R., Vitev, I., Vogt, R., Wang, E., Wang, X.N., Werner, K., Wessels, E., Wheaton, S., Wicks, S., Wolschin, G., Xiao, B-W, Xu, Z., Yasui, S., Zabrodin, E., Zapp, K., Zhang, B., Zhang, B-W, Zhang, H., and Zhou, D.

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Phenomenology
Abstract

This writeup is a compilation of the predictions for the forthcoming Heavy Ion Program at the Large Hadron Collider, as presented at the CERN Theory Institute 'Heavy Ion Collisions at the LHC - Last Call for Predictions', held from May 14th to June 10th 2007.

Published
2008

68. Heavy-ion collisions at the LHC-Last call for predictions

Author

Armesto, N., Borghini, N., Jeon, S., Wiedemann, U. A., Abreu, S., Akkelin, S. V., Alam, J., Albacete, J. L., Andronic, A., Antonov, D., Arleo, F., Arsene, I. C., Barnafoldi, G. G., Barrette, J., Bauchle, B., Becattini, F., Betz, B., Bleicher, M., Bluhm, M., Boer, D., Bopp, F. W., Braun-Munzinger, P., Bravina, L., Busza, W., Cacciari, M., Capella, A., Casalderrey-Solana, J., Chatterjee, R., Chen, L. W., Cleymans, J., Cole, B. A., Del Valle, Z. C., Csernai, L. P., Cunqueiro, L., Dainese, A., de Deus, J. D., Ding, H. T., Djordjevic, M., Drescher, H., Dremin, I. M., Dumitru, A., Engel, R., d'Enterria, D., Eskola, K. J., Fai, G., Ferreiro, E. G., Fries, R. J., Frodermann, E., Fujii, H., Gale, C., Gelis, F., Goncalves, V. P., Greco, V., Greiner, C., Gyulassy, M., van Hees, H., Heinz, U., Honkanen, H., Horowitz, W. A., Iancu, E., Ingelman, G., Jalilian-Marian, J., Kaidalov, A. B., Kampfer, B., Kang, Z. B., Karpenko, I. A., Kestin, G., Kharzeev, D., Ko, C. M., Koch, B., Kopeliovich, B., Kozlov, M., Kraus, I., Kuznetsova, I., Lee, S. H., Lednicky, R., Letessier, J., Levin, E., Li, B. A., Lin, Z. W., Liu, H., Liu, W., Loizides, C., Lokhtin, I. P., Machado, M. V. T., Malinina, L. V., Managadze, A. M., Mangano, M. L., Mannarelli, M., Manuel, C., Martinez, G., Milhano, J. G., Mocsy, A., Molnar, D., Nardi, M., Nayak, J. K., Niemi, H., Oeschler, H., Ollitrault, J. Y., Paic, G., Pajares, C., Pantuev, V. S., Papp, G., Peressounko, D., Petreczky, P., Petrushanko, S. V., Piccinini, F., Pierog, T., Pirner, H. J., Porteboeuf, S., Potashnikova, I., Qin, G. Y., Qiu, J. W., Rafelski, J., Rajagopal, K., Ranft, J., Rapp, R., Rasanen, S. S., Rathsman, J., Rau, P., Redlich, K., Renk, T., Rezaeian, A. H., Rischke, D., Roesler, S., Ruppert, J., Ruuskanen, P. V., Salgado, C. A., Sapeta, S., Sarcevic, I., Sarkar, S., Sarycheva, L. I., Schmidt, I., Shoshi, A. I., Sinha, B., Sinyukov, Y. M., Snigirev, A. M., Srivastava, D. K., Stachel, J., Stasto, A., Stocker, H., Teplov, C. Y., Thews, R. L., Torrieri, G., Pop, V. T., Triantafyllopoulos, D. N., Tuchin, K. L., Turbide, S., Tywoniuk, K., Utermann, A., Venugopalan, R., Vitev, I., Vogt, R., Wang, E., Wang, X. N., Werner, K., Wessels, E., Wheaton, S., Wicks, S., Wolschin, G., Xiao, B. W., Xu, Z., Yasui, S., Zabrodin, E., Zapp, K., Zhang, B., Zhang, B. W., Zhang, H., Zhou, D., Armesto, N., Borghini, N., Jeon, S., Wiedemann, U. A., Abreu, S., Akkelin, S. V., Alam, J., Albacete, J. L., Andronic, A., Antonov, D., Arleo, F., Arsene, I. C., Barnafoldi, G. G., Barrette, J., Bauchle, B., Becattini, F., Betz, B., Bleicher, M., Bluhm, M., Boer, D., Bopp, F. W., Braun-Munzinger, P., Bravina, L., Busza, W., Cacciari, M., Capella, A., Casalderrey-Solana, J., Chatterjee, R., Chen, L. W., Cleymans, J., Cole, B. A., Del Valle, Z. C., Csernai, L. P., Cunqueiro, L., Dainese, A., de Deus, J. D., Ding, H. T., Djordjevic, M., Drescher, H., Dremin, I. M., Dumitru, A., Engel, R., d'Enterria, D., Eskola, K. J., Fai, G., Ferreiro, E. G., Fries, R. J., Frodermann, E., Fujii, H., Gale, C., Gelis, F., Goncalves, V. P., Greco, V., Greiner, C., Gyulassy, M., van Hees, H., Heinz, U., Honkanen, H., Horowitz, W. A., Iancu, E., Ingelman, G., Jalilian-Marian, J., Kaidalov, A. B., Kampfer, B., Kang, Z. B., Karpenko, I. A., Kestin, G., Kharzeev, D., Ko, C. M., Koch, B., Kopeliovich, B., Kozlov, M., Kraus, I., Kuznetsova, I., Lee, S. H., Lednicky, R., Letessier, J., Levin, E., Li, B. A., Lin, Z. W., Liu, H., Liu, W., Loizides, C., Lokhtin, I. P., Machado, M. V. T., Malinina, L. V., Managadze, A. M., Mangano, M. L., Mannarelli, M., Manuel, C., Martinez, G., Milhano, J. G., Mocsy, A., Molnar, D., Nardi, M., Nayak, J. K., Niemi, H., Oeschler, H., Ollitrault, J. Y., Paic, G., Pajares, C., Pantuev, V. S., Papp, G., Peressounko, D., Petreczky, P., Petrushanko, S. V., Piccinini, F., Pierog, T., Pirner, H. J., Porteboeuf, S., Potashnikova, I., Qin, G. Y., Qiu, J. W., Rafelski, J., Rajagopal, K., Ranft, J., Rapp, R., Rasanen, S. S., Rathsman, J., Rau, P., Redlich, K., Renk, T., Rezaeian, A. H., Rischke, D., Roesler, S., Ruppert, J., Ruuskanen, P. V., Salgado, C. A., Sapeta, S., Sarcevic, I., Sarkar, S., Sarycheva, L. I., Schmidt, I., Shoshi, A. I., Sinha, B., Sinyukov, Y. M., Snigirev, A. M., Srivastava, D. K., Stachel, J., Stasto, A., Stocker, H., Teplov, C. Y., Thews, R. L., Torrieri, G., Pop, V. T., Triantafyllopoulos, D. N., Tuchin, K. L., Turbide, S., Tywoniuk, K., Utermann, A., Venugopalan, R., Vitev, I., Vogt, R., Wang, E., Wang, X. N., Werner, K., Wessels, E., Wheaton, S., Wicks, S., Wolschin, G., Xiao, B. W., Xu, Z., Yasui, S., Zabrodin, E., Zapp, K., Zhang, B., Zhang, B. W., Zhang, H., and Zhou, D.

Abstract

This writeup is a compilation of the predictions for the forthcoming Heavy Ion Program at the Large Hadron Collider, as presented at the CERN Theory Institute 'Heavy Ion Collisions at the LHC - Last Call for Predictions', held from 14th May to 10th June 2007.

Published
2008

70. Heavy-ion collisions at the LHC—Last call for predictions

Author

Armesto, N, primary, Borghini, N, additional, Jeon, S, additional, Wiedemann, U A, additional, Abreu, S, additional, Akkelin, S V, additional, Alam, J, additional, Albacete, J L, additional, Andronic, A, additional, Antonov, D, additional, Arleo, F, additional, Armesto, N, additional, Arsene, I C, additional, Barnaföldi, G G, additional, Barrette, J, additional, Bäuchle, B, additional, Becattini, F, additional, Betz, B, additional, Bleicher, M, additional, Bluhm, M, additional, Boer, D, additional, Bopp, F W, additional, Braun-Munzinger, P, additional, Bravina, L, additional, Busza, W, additional, Cacciari, M, additional, Capella, A, additional, Casalderrey-Solana, J, additional, Chatterjee, R, additional, Chen, L-W, additional, Cleymans, J, additional, Cole, B A, additional, Valle, Z Conesa Del, additional, Csernai, L P, additional, Cunqueiro, L, additional, Dainese, A, additional, Deus, J Dias de, additional, Ding, H-T, additional, Djordjevic, M, additional, Drescher, H, additional, Dremin, I M, additional, Dumitru, A, additional, El, A, additional, Engel, R, additional, d'Enterria, D, additional, Eskola, K J, additional, Fai, G, additional, Ferreiro, E G, additional, Fries, R J, additional, Frodermann, E, additional, Fujii, H, additional, Gale, C, additional, Gelis, F, additional, Gonçalves, V P, additional, Greco, V, additional, Greiner, C, additional, Gyulassy, M, additional, Hees, H van, additional, Heinz, U, additional, Honkanen, H, additional, Horowitz, W A, additional, Iancu, E, additional, Ingelman, G, additional, Jalilian-Marian, J, additional, Kaidalov, A B, additional, Kämpfer, B, additional, Kang, Z-B, additional, Karpenko, Iu A, additional, Kestin, G, additional, Kharzeev, D, additional, Ko, C M, additional, Koch, B, additional, Kopeliovich, B, additional, Kozlov, M, additional, Kraus, I, additional, Kuznetsova, I, additional, Lee, S H, additional, Lednicky, R, additional, Letessier, J, additional, Levin, E, additional, Li, B-A, additional, Lin, Z-W, additional, Liu, H, additional, Liu, W, additional, Loizides, C, additional, Lokhtin, I P, additional, Machado, M V T, additional, Malinina, L V, additional, Managadze, A M, additional, Mangano, M L, additional, Mannarelli, M, additional, Manuel, C, additional, Martínez, G, additional, Milhano, J G, additional, Mócsy, Á, additional, Molnár, D, additional, Nardi, M, additional, Nayak, J K, additional, Niemi, H, additional, Oeschler, H, additional, Ollitrault, J-Y, additional, Paić, G, additional, Pajares, C, additional, Pantuev, V S, additional, Papp, G, additional, Peressounko, D, additional, Petreczky, P, additional, Petrushanko, S V, additional, Piccinini, F, additional, Pierog, T, additional, Pirner, H J, additional, Porteboeuf, S, additional, Potashnikova, I, additional, Qin, G Y, additional, Qiu, J-W, additional, Rafelski, J, additional, Rajagopal, K, additional, Ranft, J, additional, Rapp, R, additional, Räsänen, S S, additional, Rathsman, J, additional, Rau, P, additional, Redlich, K, additional, Renk, T, additional, Rezaeian, A H, additional, Rischke, D, additional, Roesler, S, additional, Ruppert, J, additional, Ruuskanen, P V, additional, Salgado, C A, additional, Sapeta, S, additional, Sarcevic, I, additional, Sarkar, S, additional, Sarycheva, L I, additional, Schmidt, I, additional, Shoshi, A I, additional, Sinha, B, additional, Sinyukov, Yu M, additional, Snigirev, A M, additional, Srivastava, D K, additional, Stachel, J, additional, Stasto, A, additional, Stöcker, H, additional, Teplov, C Yu, additional, Thews, R L, additional, Torrieri, G, additional, Pop, V Topor, additional, Triantafyllopoulos, D N, additional, Tuchin, K L, additional, Turbide, S, additional, Tywoniuk, K, additional, Utermann, A, additional, Venugopalan, R, additional, Vitev, I, additional, Vogt, R, additional, Wang, E, additional, Wang, X N, additional, Werner, K, additional, Wessels, E, additional, Wheaton, S, additional, Wicks, S, additional, Wolschin, G, additional, Xiao, B-W, additional, Xu, Z, additional, Yasui, S, additional, Zabrodin, E, additional, Zapp, K, additional, Zhang, B, additional, Zhang, B-W, additional, Zhang, H, additional, and Zhou, D, additional

Published
2008
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73. NLO CORRECTIONS TO HARD PROCESS IN PARTON SHOWER MC -- KrkNLO METHOD.

Author

JADACH, S., PŁACZEK, W., SAPETA, S., SIÓDMOK, A., and SKRZYPEK, M.

Subjects
PARTONS, BOSONS, MONTE Carlo method, NUMERICAL calculations, HADRON colliders
Abstract

A new method of combining an NLO-corrected hard process with an LO parton shower Monte Carlo, nicknamed KrkNLO, was proposed recently. It is simpler than well-established two other methods: MC@NLO and POWHEG. In this contribution, we present some results of extensive numerical tests of the new method for single Z-boson production at hadron colliders and numerical comparisons with two other methods as well as with NNLO calculations. [ABSTRACT FROM AUTHOR]

Published
2015
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78. Hadron-Hadron and Cosmic-Ray Interactions at multi-TeV Energies

Author

Alessandro, B., Bergman, D., Bongi, M., Bunyatyan, A., Cazon, L., D Enterria, D., Mitri, I., Doll, P., Engel, R., Eggert, K., Garzelli, M., Gerhardt, L., Gieseke, S., Godbole, R., Grosse-Oetringhaus, J. F., Gustafson, G., Hebbeker, T., Kheyn, L., Kiryluk, J., Lipari, P., Ostapchenko, S., Pierog, T., Olga Piskounova, Ranft, J., Rezaeian, A., Rostovtsev, A., Sakurai, N., Sapeta, S., Schleich, S., Schulz, H., Sjostrand, T., Sonnenschein, L., Sutton, M., Ulrich, R., Werner, K., Zapp, K., Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Astrophysics::High Energy Astrophysical Phenomena, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], High Energy Physics::Phenomenology, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], High Energy Physics - Experiment, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Astrophysics - High Energy Astrophysical Phenomena, Nuclear Experiment
Abstract

The workshop on "Hadron-Hadron and Cosmic-Ray Interactions at multi-TeV Energies" held at the ECT* centre (Trento) in Nov.-Dec. 2010 gathered together both theorists and experimentalists to discuss issues of the physics of high-energy hadronic interactions of common interest for the particle, nuclear and cosmic-ray communities. QCD results from collider experiments -- mostly from the LHC but also from the Tevatron, RHIC and HERA -- were discussed and compared to various hadronic Monte Carlo generators, aiming at an improvement of our theoretical understanding of soft, semi-hard and hard parton dynamics. The latest cosmic-ray results from various ground-based observatories were also presented with an emphasis on the phenomenological modeling of the first hadronic interactions of the extended air-showers generated in the Earth atmosphere. These mini-proceedings consist of an introduction and short summaries of the talks presented at the meeting., 46 pages, 13 figures; Mini-proceedings ECT* Workshop, Trento, Nov. 28 - Dec. 3, 2010. FP7 acknowledgements added

79. The SM and NLO Multileg and SM MC Working Groups: Summary Report

Author

Alcaraz Maestre, J., Heinrich, G., Buckley, A., Cacciari, M., Campanario, F., Chanon, N., Chachamis, G., Ciulli, V., Cossutti, F., Cullen, G., Denner, A., Dittmaier, S., Huston, J., Fleischer, J., Frederix, R., Frixione, S., Gao, J., Garren, L., Gascon-Shotkin, S., Greiner, N., Guillet, J. P., Hapola, T., Hartland, N. P., Krauss, F., Hesketh, G., Hirschi, V., Hoeth, H., Jezo, T., Kallweit, S., Kovarik, K., Kusina, A., Liang, Z., Lenzi, P., Lonnblad, L., Maitre, D., Lopez-Villarejo, J. J., Luisoni, G., Maltoni, F., Mastrolia, P., Nadolsky, P. M., Oleari, C., Olness, F. I., Ossola, G., Pilon, E., Platzer, S., Nurse, E., Pozzorini, S., Prestel, S., Re, E., Reiter, T., Riemann, T., Rojo, J., Salam, G. P., Sapeta, S., Schienbein, I., Schonherr, M., Pittau, R., Schulz, H., Schulze, M., Schwoerer, M., Skands, P., Smillie, J. M., Somogyi, G., Soyez, G., Stavreva, T., Stewart, I. W., Stockton, M., Alioli, S., or, Z. Sz\H., Tackmann, F. J., Torrielli, P., Tramontano, F., Tripiana, M., Trocsanyi, Z., Ubiali, M., Yundin, V., Weinzierl, S., Winter, J., Andersen, J. R., Yu, J. Y., Zapp, K., SM and NLO Multileg Working Group Collaboration, SM MC Working Group Collaboration, Ball, R. D., Edinburgh University, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institute of High Energy Physics (IHEP), Chinese Academy of Sciences [Changchun Branch] (CAS), CMS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Medical Office of Gynaecology, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), National Institute for Subatomic Physics [Amsterdam] (NIKHEF), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), National Center for Atmospheric Research [Boulder] (NCAR), Les Houches Workshop Proceedings, Boudjema, Fawzi, University of Edinburgh, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
showers [parton], [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], higher-order, CMS, High Energy Physics::Phenomenology, FOS: Physical sciences, Monte Carlo [numerical calculations], ATLAS, programming, production [jet], HERWIG, High Energy Physics - Experiment, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), CERN LHC Coll, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], quantum chromodynamics, PYTHIA, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Batavia TEVATRON Coll, distribution function [parton], Particle Physics - Phenomenology
Abstract

The 2011 Les Houches workshop was the first to confront LHC data. In the two years since the previous workshop there have been significant advances in both soft and hard QCD, particularly in the areas of multi-leg NLO calculations, the inclusion of those NLO calculations into parton shower Monte Carlos, and the tuning of the non-perturbative parameters of those Monte Carlos. These proceedings describe the theoretical advances that have taken place, the impact of the early LHC data, and the areas for future development., Comment: 220 pages

80. Parton fragmentation in the vacuum and in the medium

Author

Albino, S., Anulli, F., Arleo, F., Besson, Dave Z., Brooks, William K., Buschbeck, B., Cacciari, M., Christova, E., Corcella, G., D Enterria, David G., Dolejsi, Jiri, Domdey, S., Estienne, M., Hamacher, Klaus, Heinz, M., Hicks, K., Kettler, D., Kumano, S., Moch, S. O., Muccifora, V., Pacetti, S., Perez-Ramos, R., Pirner, H. J., Pronko, Alexandre Pavlovich, Radici, M., Rak, J., Roland, C., Rudolph, Gerald, Rurikova, Z., Salgado, C. A., Sapeta, S., Saxon, David H., Seidl, Ralf-Christian, Seuster, R., Stratmann, M., Tannenbaum, Michael J., Tasevsky, M., Trainor, T., Traynor, D., Monique Werlen, and Zhou, C.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, hep-ph, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We present the mini-proceedings of the workshop on ``Parton fragmentation in the vacuum and in the medium'' held at the European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*, Trento) in February 2008. The workshop gathered both theorists and experimentalists to discuss the current status of investigations of quark and gluon fragmentation into hadrons at different accelerator facilities (LEP, B-factories, JLab, HERA, RHIC, and Tevatron) as well as preparations for extension of these studies at the LHC. The main physics topics covered were: (i) light-quark and gluon fragmentation in the vacuum including theoretical (global fits analyses and MLLA) and experimental (data from e+e-, p-p, e-p collisions) aspects, (ii) strange and heavy-quark fragmentation, (iii) parton fragmentation in cold QCD matter (nuclear DIS), and (iv) medium-modified fragmentation in hot and dense QCD matter (high-energy nucleus-nucleus collisions). These mini-proceedings consist of an introduction and short summaries of the talks presented at the meeting., Comment: 43 pages, mini-proceedings Workshop ECT*, Trento, Feb. 25 - 29, 2008

81. Proceedings of the workshop 'Standard Model at the LHC' University College London 30 March - 1 April 2009

Author

Campanelli, M., Mrinal Dasgupta, Delenda, Y., Jeff Forshaw, Kar, D., Keats, J., Khoze, V. A., Lami, S., Martin, A. D., Simone Marzani, Andrew Pilkington, Ryskin, M. G., Sapeta, S., Watt, G., and White, C.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, FOS: Physical sciences
Abstract

Proceedings from a 3-day discussion on Standard Model discoveries with the first LHC data, 9 contributions to the proceedings of the LHC Standard Model workshop

82. TMDlib2 and TMDplotter: a platform for 3D hadron structure studies

Author

J. Lidrych, Krzysztof Kutak, Francesco Hautmann, S. Taheri Monfared, Maddalen Mendizabal, Q. Wang, Giulia Sorrentino, Michael Schmitz, Anatoly V. Kotikov, M. Vanden Bemden, Marcin Bury, N. A. Abdulov, Aleksandra Lelek, Alessandro Bacchetta, H. Yang, Sebastian Sapeta, C. Bissolotti, L. I. Estevez Banos, S. Prestel, Fanny Guzman, Gennady Lykasov, A. Bermúdez Martínez, Andrea Signori, S.P. Baranov, S. Sadeghi Barzani, Hannes Jung, A.M. van Kampen, A. V. Lipatov, Vieri Candelise, Martin Hentschinski, A. van Hameren, A. Kusina, Patrick Connor, Laurent Favart, Alexey Vladimirov, M. A. Malyshev, V. Bertone, L. Keersmaekers, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Abdulov, N. A., Bacchetta, A., Baranov, S., Bermudez Martinez, A., Bertone, V., Bissolotti, C., Candelise, V., Estevez Banos, L. I., Bury, M., Connor, P. L. S., Favart, L., Guzman, F., Hautmann, F., Hentschinski, M., Jung, H., Keersmaekers, L., Kotikov, A., Kusina, A., Kutak, K., Lelek, A., Lidrych, J., Lipatov, A., Lykasov, G., Malyshev, M., Mendizabal, M., Prestel, S., Sadeghi Barzani, S., Sapeta, S., Schmitz, M., Signori, A., Sorrentino, G., Taheri Monfared, S., van Hameren, A., van Kampen, A. M., Vanden Bemden, M., Vladimirov, A., Wang, Q., and Yang, H.

Subjects
Nuclear Theory, Physics and Astronomy (miscellaneous), dimension: 3, Hadron, Transverse-momentum-dependent parton distribution and fragmentation functions, computing, hadron structure, hadronization, C++, collinear, parton: distribution function, Parton, QC770-798, hadron structure, Astrophysics, transverse momentum dependence, 01 natural sciences, hadron: structure, QCD, TMD factorization, high-energy factorization, TMD PDFs, TMD FFs, unintegrated PDFs, small-x physics, High Energy Physics - Phenomenology (hep-ph), high-energy factorization, Nuclear Experiment (nucl-ex), Nuclear Experiment, computer, Physics, ddc:530, structure [hadron], QB460-466, High Energy Physics - Phenomenology, 3 [dimension], TMD PDFs, unintegrated PDFs, distribution function [parton], Particle physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], TMD FFs, small-x physics, Structure (category theory), FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory (nucl-th), computing, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, 010306 general physics, Engineering (miscellaneous), C++, 010308 nuclear & particles physics, 530 Physik, Transverse-momentum-dependent parton distribution and fragmentation functions, QCD, TMD factorization, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], hadronization
Abstract

The European physical journal / C 81(8), 752 (1-10) (2021). doi:10.1140/epjc/s10052-021-09508-8, A common library, TMDlib2, for Transverse-Momentum-Dependent distributions (TMDs) and unintegrated parton distributions (uPDFs) is described, which allows for easy access of commonly used TMDs and uPDFs, providing a three-dimensional (3D) picture of the partonic structure of hadrons. The tool TMDplotter allows for web-based plotting of distributions implemented in TMDlib2, together with collinear pdfs as available in LHAPDF., Published by Springer, Heidelberg

Published
2021

83. Ultrahigh-resolution anterior segment optical coherence tomography for analysis of corneal microarchitecture during wound healing.

Author

Pantalon A, Pfister M, Aranha Dos Santos V, Sapeta S, Unterhuber A, Pircher N, Schmidinger G, Garhöfer G, Schmidl D, Schmetterer L, and Werkmeister RM

Subjects
Animals, Female, Humans, Rabbits, Cornea pathology, Corneal Topography, Disease Models, Animal, Anterior Eye Segment pathology, Corneal Injuries diagnosis, Imaging, Three-Dimensional, Keratoconus diagnosis, Tomography, Optical Coherence methods, Wound Healing
Abstract

Purpose: To employ ultrahigh-resolution (UHR) optical coherence tomography (OCT) for investigation of the early wound healing process in corneal epithelium., Methods: A custom-built UHR-OCT system assessed epithelial healing in human keratoconic cornea after epi-off crosslinking (CXL) procedure and a wound healing model in rabbits with iatrogenic corneal injury. 3D OCT data sets enhanced obtaining epithelial thickness maps and evaluation of reepithelization stage. Accompanying changes in deeper corneal microarchitecture were analysed., Results: The mean central corneal thickness in 40 eyes with keratoconus at baseline was 482.7 ± 38.2 μm, while mean central epithelial thickness (CET) was 43.8 ± 6.4 μm. At the final visit 20 ± 5 days post-CXL procedure, CET was 35.0 ± 5.8 μm, significantly thinner after reepithelization (p < 0.001). Surgical success was assessed at the final visit through the demarcation line (DL), identified at 43.7 ± 13.5% stromal depth. In rabbits, the mean CET in 20 eyes at baseline was 35.9 ± 2.6 μm. In rabbits that revealed complete wound closure (10/20 eyes) at the last study day at 72 hr, CET was significantly thinner compared to baseline (30.4 ± 2.8 μm versus 35.4 ± 2.9 μm, p = 0.005). An intra-stromal landmark indicating early keratocyte apoptosis was measured at 30.0 ± 5.1% stromal depth. Epithelial thickness maps showed the time-course of corneal healing., Conclusion: Ultrahigh-resolution (UHR)-OCT provided precise assessment of epithelial wound and its healing by 3D-mapping. In addition, microarchitectural changes in the cornea in early phases of epithelial healing were revealed., (© 2019 The Authors. Acta Ophthalmologica published by John Wiley & Sons Ltd on behalf of Acta Ophthalmologica Scandinavica Foundation.)

Published
2019
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84. Calculations with off-shell matrix elements, TMD parton densities and TMD parton showers.

Author

Bury M, van Hameren A, Jung H, Kutak K, Sapeta S, and Serino M

Abstract

A new calculation using off-shell matrix elements with TMD parton densities supplemented with a newly developed initial state TMD parton shower is described. The calculation is based on the KaTie package for an automated calculation of the partonic process in high-energy factorization, making use of TMD parton densities implemented in TMDlib. The partonic events are stored in an LHE file, similar to the conventional LHE files, but now containing the transverse momenta of the initial partons. The LHE files are read in by the Cascade package for the full TMD parton shower, final state shower and hadronization from Pythia where events in HEPMC format are produced. We have determined a full set of TMD parton densities and developed an initial state TMD parton shower, including all flavors following the TMD distribution. As an example of application we have calculated the azimuthal de-correlation of high [Formula: see text] dijets as measured at the LHC and found very good agreement with the measurement when including initial state TMD parton showers together with conventional final state parton showers and hadronization.

Published
2018
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85. Ultrahigh-resolution OCT imaging of the human cornea.

Author

Werkmeister RM, Sapeta S, Schmidl D, Garhöfer G, Schmidinger G, Aranha Dos Santos V, Aschinger GC, Baumgartner I, Pircher N, Schwarzhans F, Pantalon A, Dua H, and Schmetterer L

Abstract

We present imaging of corneal pathologies using optical coherence tomography (OCT) with high resolution. To this end, an ultrahigh-resolution spectral domain OCT (UHR-OCT) system based on a broad bandwidth Ti:sapphire laser is employed. With a central wavelength of 800 nm, the imaging device allows to acquire OCT data at the central, paracentral and peripheral cornea as well as the limbal region with 1.2 µm x 20 µm (axial x lateral) resolution at a rate of 140 000 A-scans/s. Structures of the anterior segment of the eye, not accessible with commercial OCT systems, are visualized. These include corneal nerves, limbal palisades of Vogt as well as several corneal pathologies. Cases such as keratoconus and Fuchs's endothelial dystrophy as well as infectious changes caused by diseases like Acanthamoeba keratitis and scarring after herpetic keratitis are presented. We also demonstrate the applicability of our system to visualize epithelial erosion and intracorneal foreign body after corneal trauma as well as chemical burns. Finally, results after Descemet's membrane endothelial keratoplasty (DMEK) are imaged. These clinical cases show the potential of UHR-OCT to help in clinical decision-making and follow-up. Our results and experience indicate that UHR-OCT of the cornea is a promising technique for the use in clinical practice, but can also help to gain novel insight in the physiology and pathophysiology of the human cornea.

Published
2017
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86. Factors Determining Flicker-Induced Retinal Vasodilation in Healthy Subjects.

Author

Sharifizad M, Witkowska KJ, Aschinger GC, Sapeta S, Rauch A, Schmidl D, Werkmeister RM, Garhöfer G, and Schmetterer L

Subjects
Adult, Blood Pressure physiology, Cholesterol blood, Female, Humans, Male, Photic Stimulation methods, Regression Analysis, Retinal Artery physiology, Retinal Vein physiology, Retrospective Studies, Vasodilation physiology, Lighting, Retinal Artery radiation effects, Retinal Vein radiation effects, Vasodilation radiation effects
Abstract

Purpose: The purpose of this study was to analyze factors determining retinal arterial and venous responses to stimulation with diffuse luminance flicker in healthy subjects., Methods: We retrospectively analyzed results obtained in 374 healthy subjects who had previously participated in clinical studies in our department. A total of 153 subjects underwent a protocol in which flicker stimulation was delivered through the fundus camera at 8 Hz (protocol 1), separating measurement and stimulation light depending on the wavelength, and 221 subjects underwent a protocol in which diffuse luminance flicker was delivered at 12.5 Hz with high modulation depth (protocol 2). We investigated whether sex, systemic blood pressure, baseline vessel size, blood plasma concentration of fasting glucose and hematocrit, and serum concentration of cholesterol, triglycerides, creatinine and C-reactive protein influenced the retinal vascular response to flicker stimulation., Results: Flicker responses in arteries and veins were more pronounced in protocol 2 than in protocol 1 (P < 0.001, each). In both of the protocols the vascular response to stimulation with diffuse luminance flicker was larger in smaller vessels (P between 0.001 and 0.016). In protocol 2 the retinal arterial flicker response was negatively associated with cholesterol serum levels (P = 0.033); in protocol 1, only a tendency toward this effect was observed (P = 0.056)., Conclusions: The present analysis indicates that retinal arterial and venous responses to stimulation with diffuse luminance flicker depend on the way the stimulation is delivered through the fundus camera. In addition, the flicker response varied with vessel size, that is, the smaller the vessel width, the larger the flicker response. Finally, our data indicate that, even within the normal range, higher cholesterol serum levels are associated with lower hyperemic flicker responses.

Published
2016
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