Matching matrix elements and shower evolution for top-pair production in hadronic collisions

By M. Mangano, M. Moretti, F. Piccinini, Michele Treccani. 2006

765 citations recorded by the source corpus.

We study the matching of multijet matrix elements and shower evolution in the case of top production in hadronic collisions at the Tevatron and at the LHC. We present the results of the matching algorithm implemented in the ALPGEN Monte Carlo generator, and compare them with results obtained at the parton level, and with the predictions of the MC@NLO approach. We highlight the consistency of the matching algorithm when applied to these final states, and the excellent agreement obtained with MC@NLO for most inclusive quantities. We nevertheless identify also a remarkable difference in the rapidity spectrum of the leading jet accompanying the top quark pair, and comment on the likely origin of this discrepancy.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f8bc04b39fcdf71ad39c4f82e2d3098e663ec10d

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Citations in the corpus

Search for dark matter candidates and large extra dimensions in events with a jet and missing transverse momentum with the ATLAS detector (2012, methodology): “The MLM [42] prescription is used for matching the matrix-element calculations to the parton shower”
NLO matrix elements and truncated showers (2010, result): “J H E P 0 8 ( 2 0 1 1 ) 1 2 3 known as “MLM merging”, was suggested in [18, 19] and described in more detail and compared with the other algorithms in [20, 21].”
MadGraph 5: going beyond (2011, methodology): “Here again, signiﬁcant progress has been made in the development of merging algorithms, such as CKKW and MLM merging [36, 37, 38, 39, 40, 41, 42], and in their comparison [43, 44], with applications to SM [45, 39, 46] and to BSM [47] processes.”
Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV (2017, methodology): “2 at leading order (LO), using the MLM matching scheme [27].”
Measurements of Higgs boson properties in the diphoton decay channel with 36 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector (2018, neutral): “The generated events are passed to Pythia8 [29] to provide parton showering, hadronization and underlying event and the zero-, one- and two-parton events are merged using the MLM matching scheme [148] to create the full final state.”
The dark Z′ portal: direct, indirect and collider searches (2013, methodology): “calculated from matrix elements in MLM scheme [92] at appropriate matching scales.”
Jet substructure at the Large Hadron Collider: A review of recent advances in theory and machine learning (2017, methodology): “This is now well-established at NLO, and a variety of different techniques exist and are implemented into standard programs [173, 174, 175, 176, 177, 178, 179, 180, 181].”
NLO Higgs boson production via gluon fusion matched with shower in POWHEG (2008, background): “[ 17 ], carried out in the framework of heavy-flavour production, the origin of the rapidity dip was tracked back to an even stronger dip in the pure HERWIG distribution, that the MC@NLO correction was not able to properly fill.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, methodology): “The generation of signal events at ATLAS is done at NLO with MadGraph5_aMC@NLO [372, 1190] and the effective field theory framework developed in the TopFCNC model is used [1157, 1172].”
Gaugino production in proton-proton collisions at a center-of-mass energy of 8 TeV (2012, methodology): “Therefore, several matching algorithms, such as the Catani-Krauss-Kuhn-Webber (CKKW) scheme based on event reweighting [62, 63] or the Mangano (MLM) scheme based on event rejection [64], have been developed to combine the two methods in a consistent way.”
NLO vector-boson production matched with shower in POWHEG (2008, methodology): “In ref. [ 20 ], a discrepancy was found in the rapidity distribution of the hardest radiated jet as computed in MC@NLO and ALPGEN, for the case of top pair production at the Tevatron.”
Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at root s=8 TeV with the ATLAS detector (2015, neutral): “The MLM prescription [85] is used for matching the matrix-element calculations of MADGRAPH5 to the parton shower evolution of PYTHIA-6.”