HW ±/HZ + 0 and 1 jet at NLO with the POWHEG BOX interfaced to GoSam and their merging within MiNLO

Luisoni, Gionata; Nason, Paolo; Oleari, C.; Tramontano, Francesco

doi:10.1007/jhep10(2013)083

Cited by 179 publications

(184 citation statements)

References 69 publications

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“…Simulated events for qq → V H plus zero or one jet production at next-to-leading order (NLO) were generated with the Powheg-Box v2 + GoSam + MiNLO generator [38,[41][42][43] (named Powheg+MiNLO in the rest of the article). The contribution from gg → ZH (gluon-induced) production was simulated using the leading-order (LO) Powheg-Box v2 matrix-element generator.…”

Section: Jhep12(2017)024mentioning

confidence: 99%

Evidence for the H → b b ¯ $$ H\to b\overline{b} $$ decay with the ATLAS detector

Aaboud

Aad

Abbott

et al. 2017

J. High Energ. Phys.

110

123

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A search for the decay of the Standard Model Higgs boson into a bb pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb −1 , were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Final states containing zero, one and two charged leptons (electrons or muons) are considered, targeting the decays Z → νν, W → ν and Z → . For a Higgs boson mass of 125 GeV, an excess of events over the expected background from other Standard Model processes is found with an observed significance of 3.5 standard deviations, compared to an expectation of 3.0 standard deviations. This excess provides evidence for the Higgs boson decay into b-quarks and for its production in association with a vector boson. The combination of this result with that of the Run 1 analysis yields a ratio of the measured signal events to the Standard Model expectation equal to 0. [7]. The properties of the discovered particle have been measured using the Run 1 dataset, collected at centre-of-mass energies of 7 TeV and 8 TeV, and were found to be compatible with those predicted by the Standard Model (SM) within uncertainties, typically of the order of ±20% [8-11]. The Run 2 dataset at an energy of 13 TeV provides an opportunity to increase the precision of such measurements, and to challenge theory predictions further. While analyses of Higgs bosons decaying into vector bosons are entering an era of detailed differential measurements, direct evidence for the coupling of the Higgs boson to fermions was established only via the observation of the decay into τ -leptons through the combination of ATLAS and CMS Run 1 results [11], and, more recently, through the combination of CMS Run 1 and Run 2 results [12]. Although the gluon-gluon fusion production mode provides indirect evidence for the coupling of the Higgs boson to top quarks, there is currently no direct observation of the coupling of the Higgs boson to quarks. The decay of the SM Higgs boson into pairs of b-quarks is expected to have a branching ratio of 58% for m H = 125 GeV [13], the largest among all decay modes. Accessing H → bb decays is therefore crucial for constraining, under fairly general assumptions [14,15], the overall Higgs boson decay width. At the LHC, the very large backgrounds arising from multi-jet production make an inclusive search extremely challenging. The most sensitive production modes for probing H → bb decays are those where the Higgs boson is produced in association with a W or Z boson [16]; their leptonic decay modes lead to clean signatures that can be efficiently triggered on, while rejecting most of the multi-jet backgrounds.Searches for a Higgs boson in the bb decay mode were conducted at the Tevatron by the CDF and D0 Collaborations. They reported an excess of events in V H associated production (where V is used to denote W or Z) in the mass range of 120 GeV to 135 GeV, with a global signifi...

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Section: Jhep12(2017)024mentioning

confidence: 99%

Evidence for the H → b b ¯ $$ H\to b\overline{b} $$ decay with the ATLAS detector

Aaboud

Aad

Abbott

et al. 2017

J. High Energ. Phys.

110

123

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“…The Higgs bosons are produced in pp collisions predominantly by gluon fusion (ggH) [54], but also by vector boson fusion (VBF) [55], and in association with a W or Z boson [56]. The ggH and VBF Higgs boson samples are generated with powheg 2.0 [57][58][59][60][61][62] while the minlo hvJ [63] extension of powheg 2.0 is used for the WH and ZH simulated samples. The MG5 amc@nlo [64] generator is used for Z + jets and W + jets processes.…”

Section: Collision Data and Simulated Eventsmentioning

confidence: 99%

Search for lepton flavour violating decays of the Higgs boson to μτ and eτ in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

Sirunyan

Tumasyan

Adam

et al. 2018

J. High Energ. Phys.

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A search for lepton flavour violating decays of the Higgs boson in the µτ and eτ decay modes is presented. The search is based on a data set corresponding to an integrated luminosity of 35.9 fb −1 of proton-proton collisions collected with the CMS detector in 2016, at a centre-of-mass energy of 13 TeV. No significant excess over the standard model expectation is observed. The observed (expected) upper limits on the lepton flavour violating branching fractions of the Higgs boson are B(H → µτ ) < 0.25% (0.25%) and B(H → eτ ) < 0.61% (0.37%), at 95% confidence level. These results are used to derive upper limits on the off-diagonal µτ and eτ Yukawa couplings √ |Y µτ | 2 + |Y τ µ | 2 < 1.43×10 −3 and |Y eτ | 2 + |Y τ e | 2 < 2.26×10 −3 at 95% confidence level. The limits on the lepton flavour violating branching fractions of the Higgs boson and on the associated Yukawa couplings are the most stringent to date. The CMS collaboration 33 IntroductionThe discovery of the Higgs boson (H) at the CERN LHC [1][2][3] has stimulated further precision measurements of the properties of the new particle. A combined study of the 7 and 8 TeV data sets collected by the CMS and ATLAS collaborations shows consistency between the measured couplings of the Higgs boson and the standard model (SM) predictions [4]. However, the constraint on the branching fraction to non-SM decay modes derived from these measurements, B(non-SM) < 34% at 95% confidence level (CL), still allows for a significant contribution from exotic decays [4]. In this paper a search for lepton flavour violating (LFV) decays of the Higgs boson in the µτ and eτ channels is presented. These decays are forbidden in the SM but occur in many new physics scenarios. These include supersymmetric [5][6][7][8][9][10][11][12][13], composite Higgs [14,15], or Randall-Sundrum models [16][17][18], SM extensions with more than one Higgs boson doublet [19,20] or with flavour symmetries [21], and many other scenarios [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. The presence of LFV Higgs boson couplings would allow τ → µ and τ → e to proceed via a virtual Higgs boson [37,38]. Consequently the experimental limits on rare τ lepton -1 - JHEP06(2018)001decays, such as τ → eγ and τ → µγ [39], provide upper limits on B(H → µτ ) and B(H → eτ ) [40,41] of O(10%). Measurements of the electron and muon magnetic moments, and exclusion limits on the electric dipole moment of the electron also provide complementary constraints [42]. The LFV Higgs boson decay to µe is strongly constrained by the µ → eγ limit, B(H → eµ) < O(10 −9 ) [43].The CMS experiment published the first direct search for H → µτ [44], followed by searches for H → eτ and H → eµ decays [45], using proton-proton (pp) collision data corresponding to an integrated luminosity of 19.7 fb −1 at a centre-of-mass energy of 8 TeV.A small excess of data with respect to the SM background-only hypothesis at m H = 125 GeV was observed in the H → µτ channel, with a significance of 2.4 standard deviations (σ), and the bes...

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“…(27) and the FO scale. The uncertainties from the resummation and the transition between resummation and FO can be estimated by choosing different sets of profile scales, which provide a sensible variation around the central scale choice.…”

Section: Choice Of the Jet Resolution Variablesmentioning

confidence: 99%

“…[8][9][10][11][12][13][14][15][16][17][18]. By now there are several methods available to combine multiple NLO calculations with parton showers [19][20][21][22][23][24][25][26][27]. More recently, combinations of specific Drell-Yan-like next-to-next-to-leading order (NNLO) calculations with parton showers have been presented in Refs.…”

Section: Introductionmentioning

confidence: 99%

Drell-Yan production atNNLL′+NNLOmatched to parton showers

et al. 2015

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We present results for Drell-Yan production from the GENEVA Monte-Carlo framework. We combine the fully differential next-to-next-to leading order (NNLO) calculation with higher-order resummation in the 0-jettiness resolution variable. The resulting parton-level events are further combined with parton showering and hadronization provided by PYTHIA8. The 0-jettiness resummation is carried out to NNLL 0 , which consistently incorporates all singular virtual and real NNLO corrections. It thus provides a natural perturbative connection between the NNLO calculation and the parton shower regime, including a systematic assessment of perturbative uncertainties. In this way, inclusive observables are correct to NNLO, up to small power corrections in the resolution cutoff. Furthermore, the perturbative accuracy of zero-jetlike resummation variables is significantly improved beyond the parton shower approximation. We provide comparisons with LHC measurements of Drell-Yan production at 7 TeV from ATLAS, CMS, and LHCb. As already observed in e þ e − collisions, for resummation-sensitive observables, the agreement with data is noticeably improved by using a lower value of α s ðM Z Þ ¼ 0.1135.

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HW ±/HZ + 0 and 1 jet at NLO with the POWHEG BOX interfaced to GoSam and their merging within MiNLO

Cited by 179 publications

References 69 publications

Evidence for the H → b b ¯ $$ H\to b\overline{b} $$ decay with the ATLAS detector

Evidence for the H → b b ¯ $$ H\to b\overline{b} $$ decay with the ATLAS detector

Search for lepton flavour violating decays of the Higgs boson to μτ and eτ in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

Drell-Yan production atNNLL′+NNLOmatched to parton showers

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