A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole

Abdallah, J.; Abreu, P.; Adam, W.; Adžić, P.; Albrecht, Thomas; Alemany–Fernández, R.; Allmendinger, T.; Allport, P. P.; Amaldi, U.; Amapane, N.; Amato, S.; Anashkin, E.; Andreazza, A.; Andringa, S.; Anjos, N.; Antilogus, P.; Apel, W. D.; Arnoud, Y.; Ask, S.; Åsman, B.; Augustin, J. E.; Augustinus, A.; Baillon, P.; Ballestrero, A.; Bambade, P.; Barbier, R.; Bardin, D. Y.; Barker, G. J.; Baroncelli, A.; Battaglia, M.; Baubillier, M.; Becks, K. H.; Begalli, M.; Behrmann, A.; Ben-Haim, E.; Benekos, N.; Benvenuti, A. C.; Bérat, C.; Berggren, M.; Bertrand, Daniel; Besançon, M.; Besson, N.; Blöch, D.; Blom, M.; Bluj, M.; Bonesini, M.; Boonekamp, M.; Booth, P.S.L.; Borisov, G.; Botner, O.; Bouquet, B.; Bowcock, T. J. V.; Boyko, I. R.; Bračko, M.; Brenner, R.; Brodet, E.; Brückman, P.; Brunet, J. M.; Buschbeck, B.; Buschmann, P.; Calvi, M.; Camporesi, T.; Canale, V.; Carena, F.; Castro, N. F.; Cavallo, F. R.; Chapkin, M.; Charpentier, Ph.; Checchia, P.; Chierici, R.; Chliapnikov, P.; Chudoba, J.; Chung, S. U.; Cieślik, K.; Collins, P.; Contri, R.; Cosme, G.; Cossutti, F.; Costa, M.; Crennell, D.; Cuevas, J.; D’Hondt, J.; Silva, T. da; Silva, W. da; Ricca, G. Della; Angelis, A. De; Boer, W. De; Clercq, C. De; Lotto, B. De; Maria, N. De; Min, A. De; Paula, L. De; Ciaccio, L. Di; Simone, A. Di; Doroba, K.; Drees, J.; Eigen, G.; Ekelöf, T.; Ellert, M.; Elsing, M.; Santo, M. C. Espírito; Fanourakis, G.; Fassouliotis, D.; Feindt, M.; Fernandez, J. P.; Ferrer, A.; Ferro, F.; Flagmeyer, U.; Foeth, H.; Fokitis, E.; Fulda-Quenzer, F.; Fuster, J.; Gandelman, M.; García, C.; Gavillet, Ph.; Gazis, E. N.; Gokieli, R.; Golob, B.; Gómez-Ceballos, G.; Gonçalves, P.; Graziani, E.; Grosdidier, G.; Grzelak, K.; Guy, J.; Haag, C.; Hallgren, A.; Hamacher, K.; Hamilton, K.; Haug, S.; Hauler, F.; Hedberg, V.; Hennecke, M.; Hoffman, J.; Holmgren, S. O.; Holt, P. J.; Houlden, M.; Jackson, J. N.; Jarlskog, G.; Jarry, P.; Jeans, D.; Johansson, Erik; Jönsson, P.; Joram, C.; Jungermann, L.; Kapusta, F.; Katsanevas, S.; Katsoufis, E.; Kernel, G.; Kerševan, B. P.; Kerzel, U.; King, B. T.; Kjaer, N. J.; Kluit, P.; Kokkinias, P.; Kourkoumelis, C.; Kouznetsov, O.; Krumstein, Z.; Kucharczyk, M.; Lämsä, J.; Leder, G.; Ledroit, F.; Leinonen, L.; Leitner, R.; Lemonne, J.; Lepeltier, V.; Lesiak, T.; Liebig, W.; Liko, D.; Lipniacka, A.; Lopes, J. H.; Lopez, J. M.; Loukas, D.; Lutz, P.; Lyons, L.; MacNaughton, J.; Malek, A.; Maltezos, S.; Mandl, F.; Marco, J.; Marco, R.; Maréchal, B.; Margoni, M.; Marin, J. C.; Mariotti, C.; Μάρκου, Α.; Martínez-Rivero, C.; Mašík, J.; Mastroyiannopoulos, N.; Matorras, F.; Matteuzzi, C.; Mazzucato, F.; Mazzucato, M.; Nulty, R. Mc; Meroni, C.; Migliore, E.; Mitaroff, W.; Mjoernmark, U.; Moa, T.; Moch, M.; Mönig, K.; Monge, R.; Montenegro, J.; Moraes, D.; Moreno, S. Carrillo; Morettini, P.; Muêller, U.; Muenich, K.; Mulders, M.; Mundim, L.; Murray, W. J.; Muryn, B.; Myatt, G.; Myklebust, T.; Nassiakou, M.; Navarria, F. L.; Nawrocki, K.; Němeček, S.; Nicolaidou, R.; Nikolenko, M.; Obłąkowska-Mucha, A.; Obraztsov, V.; Olshevski, A. G.; Onofre, A.; Orava, R.; Österberg, K.; Ouraou, A.; Oyanguren, A.; Paganoni, M.; Paiano, S.; Palacios, J.; Pałka, H.; Papadopoulou, Th. D.; Pape, L.; Parkes, C.; Parodi, F.; Parzefall, U.; Passeri, A.; Passon, O.; Peralta, L.; Perepelitsa, V.; Perrotta, A.; Petrolini, A.; Piedra, J.; Pieri, L.; Pierre, F.; Pimenta, M.; Piotto, E.; Podobnik, T.; Poireau, V.; Pol, M. E.; Polok, G.; Pozdniakov, V.; Pukhaeva, N.; Pullia, A.; Radojičić, D.; Rebecchi, P.; Rehn, J.; Reid, D.; Reinhardt, R.; Renton, P.; Richard, F.; Řídký, J.; Rivero, M.; Rodríguez, D.; Romero, A.; Ronchese, P.; Roudeau, P.; Rovelli, T.; Ruhlmann-Kleider, V.; Ryabtchikov, D.; Sadovsky, A.; Salmi, L.; Salt, J.; Sander, C.; Savoy-Navarro, A.; Schwickerath, U.; Sekulin, R.; Siebel, M.; Sisakian, A. N.; Smadja, G.; Smirnova, O.; Sokolov, A.; Sopczak, A.; Sosnowski, R.; Spassov, T.; Stanitzki, M. M.; Stocchi, A.; Strauss, J.; Stugu, B.; Szczekowski, M.; Szeptycka, M.; Szumlak, T.; Tabarelli, T.; Tegenfeldt, F.; Timmermans, J.; Tkatchev, L. G.; Tobin, M.; Todorovova, S.; Tomé, B.; Tonazzo, A.; Tortosa, P.; Trávničék, P.; Treille, D.; Tristram, G.; Trochimczuk, M.; Troncon, C.; Turluer, M. L.; Tyapkin, I. A.; Tyapkin, P.; Tzamarias, S.; Uvarov, V.; Valenti, G.; Dam, P. Van; Eldik, J. Van; Remortel, N. Van; Vulpen, I. van; Vegni, G.; Veloso, F.; Vénus, W.; Verdier, P.; Verzi, V.; Vilanova, D.; Vitale, L.; Vrba, V.; Wahlen, H.; Washbrook, A.; Weiser, C.; Wicke, D.; Wickens, J.; Wilkinson, G.; Winter, M.; Witek, M.; Yushchenko, O.; Zalewska, A.; Zalewski, P.; Zavrtanik, D.; Zhuravlov, V.; Zimin, N. I.; Zintchenko, A.; Župan, M.

doi:10.1140/epjc/s10052-011-1557-x

Cited by 55 publications

(58 citation statements)

References 36 publications

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“…The hadronization parameters for bottom quarks were tuned using the charged multiplicity in bottom events at HRS [64], SLD [69] and LEP2 [72,72,73], the light hadron spectra and event shapes in bottom events at LEP1 and SLD [43,68,70,71,79], the multiplicities of charm and bottom hadrons at the Z-pole [44,77], charm hadron spectra at LEP1 [50,83] and the bottom fragmentation function measured at LEP1 and SLD [84][85][86][87].…”

Section: Tuningmentioning

confidence: 99%

Logarithmic accuracy of angular-ordered parton showers

Bewick

Ravasio

Richardson

et al. 2020

J. High Energ. Phys.

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We study the logarithmic accuracy of angular-ordered parton showers by considering the singular limits of multiple emission matrix elements. This allows us to consider different choices for the evolution variable and propose a new choice which has both the correct logarithmic behaviour and improved performance away from the singular regions. In particular the description of e + e − event shapes in the non-logarithmic region is significantly improved.

show abstract

Section: Tuningmentioning

confidence: 99%

Logarithmic accuracy of angular-ordered parton showers

Bewick

Ravasio

Richardson

et al. 2020

J. High Energ. Phys.

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show abstract

“…This enables the color reconnection of top quark decay products with other partons, which is not allowed in the default tune. The uncertainty in the b fragmentation function is taken from measurements at LEP experiments [53][54][55] and SLD [56], and the parametrization in PYTHIA8 is changed accordingly. Finally, the semileptonic branching fractions [41] of b hadrons are varied within their measured uncertainties.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

Measurement of differential cross sections for the production of top quark pairs and of additional jets in lepton+jets events from pp collisions at
Sirunyan¹,
Tumasyan²,
Adam³
et al. 2018
Phys. Rev. D
Self Cite

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Differential and double-differential cross sections for the production of top quark pairs in proton-proton collisions at ffiffi ffi s p ¼ 13 TeV are measured as a function of kinematic variables of the top quarks and the top quark-antiquark (tt) system. In addition, kinematic variables and multiplicities of jets associated with the tt production are measured. This analysis is based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.8 fb −1 . The measurements are performed in the lepton þ jets decay channels with a single muon or electron and jets in the final state. The differential cross sections are presented at the particle level, within a phase space close to the experimental acceptance, and at the parton level in the full phase space. The results are compared to several standard model predictions that use different methods and approximations. The kinematic variables of the top quarks and the tt system are reasonably described in general, though none predict all the measured distributions. In particular, the transverse momentum distribution of the top quarks is more steeply falling than predicted. The kinematic distributions and multiplicities of jets are adequately modeled by certain combinations of next-to-leadingorder calculations and parton shower models.

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“…In Table I, for each of the four experimental data sets n, from ALEPH [19], DELPHI [22], OPAL [20], and SLD [21], the number N data Table. II.…”

Section: Resultsmentioning

confidence: 99%

“…Our analysis updates and improves similar ones in the literature [17,18] in the following respects. We included the DELPHI data [22], which had not been available then.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

B -hadron fragmentation functions at next-to-next-to-leading order from a global analysis of e+e− annihilation data

et al. 2019

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We present nonperturbative fragmentation functions (FFs) for bottom-flavored (B) hadrons both at next-to-leading (NLO) and, for the first time, at next-to-next-to-leading order (NNLO) in the MS factorization scheme with five massless quark flavors. They are determined by fitting all available experimental data of inclusive single B-hadron production in e + e − annihilation, from the ALEPH, DELPHI, and OPAL Collaborations at CERN LEP1 and the SLD Collaboration at SLAC SLC. The uncertainties in these FFs as well as in the corresponding observables are estimated using the Hessian approach. We perform comparisons with available NLO sets of B-hadron FFs. We apply our new FFs to generate theoretical predictions for the energy distribution of B hadrons produced through the decay of unpolarized or polarized top quarks, to be measured at the CERN LHC.

show abstract

A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole

Abstract: The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP. Two complementary methods are used to reconstruct the energy of weakly decaying b-hadrons, E weak with a correlation factor ρ = 92.6%.

Cited by 55 publications

References 36 publications

Logarithmic accuracy of angular-ordered parton showers

Logarithmic accuracy of angular-ordered parton showers

Measurement of differential cross sections for the production of top quark pairs and of additional jets in lepton+jets events from pp collisions at
Sirunyan¹,
Tumasyan²,
Adam³
et al. 2018
Phys. Rev. D
Self Cite

B -hadron fragmentation functions at next-to-next-to-leading order from a global analysis of e+e− annihilation data

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A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole

Abstract: The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP. Two complementary methods are used to reconstruct the energy of weakly decaying b-hadrons, E weak with a correlation factor ρ = 92.6%.

Cited by 55 publications

References 36 publications

Logarithmic accuracy of angular-ordered parton showers

Logarithmic accuracy of angular-ordered parton showers

Measurement of differential cross sections for the production of top quark pairs and of additional jets in lepton+jets events from pp collisions at Sirunyan1, Tumasyan2, Adam3 et al. 2018Phys. Rev. DSelf Cite

B -hadron fragmentation functions at next-to-next-to-leading order from a global analysis of e+e− annihilation data

Contact Info

Product

Resources

About

Measurement of differential cross sections for the production of top quark pairs and of additional jets in lepton+jets events from pp collisions at
Sirunyan¹,
Tumasyan²,
Adam³
et al. 2018
Phys. Rev. D
Self Cite