Asymmetric heavy-quark hadroproduction at LHCb: predictions and applications

Gauld, R.; Haisch, Ulrich; Pecjak, Benjamin D.

doi:10.1007/jhep03(2019)166

Cited by 8 publications

(13 citation statements)

References 131 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At high leading jet p T and m jj the prediction uncertainties are of the order of 15%, for both the bb and cc cross-sections. In principle more advanced techniques can reduce the prediction uncertainty [4] in the high m jj region, while phenomenological studies at low mass, where the renormalisation and factorisation scale uncertainty is larger, do not exist. The measurements are also compared with a leading-order prediction obtained with Pythia for both process generation and parton showering.…”

Section: Results and Predictionsmentioning

confidence: 99%

“…Since several experimental and theoretical uncertainties cancel in the ratio it provides an excellent test of the SM and of pQCD, and can also be used to obtain valuable information when used in the global fits to extract the proton PDFs [4]. In analogy with eq.…”

Section: Ratio Of Ccand Bb-dijet Cross-sectionsmentioning

confidence: 99%

“…As bb-and cc-dijet differential cross-sections can be calculated in perturbative QCD (pQCD) as a function of the dijet kinematics, comparisons between data and predictions provide a critical test of next-to-leading-order (NLO) pQCD calculations [3,4]. Measurements of differential cross-sections of heavy-flavour dijets can also be a sensitive probe of the parton distribution functions (PDFs) of the proton.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measurement of differential $$ b\overline{b} $$- and $$ c\overline{c} $$-dijet cross-sections in the forward region of pp collisions at $$ \sqrt{s} $$ = 13 TeV

Aaij

Beteta²,

Ackernley³

et al. 2021

J. High Energ. Phys.

View full text Add to dashboard Cite

The inclusive $$ b\overline{b} $$ b b ¯ - and $$ c\overline{c} $$ c c ¯ -dijet production cross-sections in the forward region of pp collisions are measured using a data sample collected with the LHCb detector at a centre-of-mass energy of 13 TeV in 2016. The data sample corresponds to an integrated luminosity of 1.6 fb−1. Differential cross-sections are measured as a function of the transverse momentum and of the pseudorapidity of the leading jet, of the rapidity difference between the jets, and of the dijet invariant mass. A fiducial region for the measurement is defined by requiring that the two jets originating from the two b or c quarks are emitted with transverse momentum greater than 20 GeV/c, pseudorapidity in the range 2.2 < η < 4.2, and with a difference in the azimuthal angle between the two jets greater than 1.5. The integrated $$ b\overline{b} $$ b b ¯ -dijet cross-section is measured to be 53.0 ± 9.7 nb, and the total $$ c\overline{c} $$ c c ¯ -dijet cross-section is measured to be 73 ± 16 nb. The ratio between $$ c\overline{c} $$ c c ¯ - and $$ b\overline{b} $$ b b ¯ -dijet cross-sections is also measured and found to be 1.37 ± 0.27. The results are in agreement with theoretical predictions at next-to-leading order.

show abstract

Section: Results and Predictionsmentioning

confidence: 99%

Section: Ratio Of Ccand Bb-dijet Cross-sectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of differential $$ b\overline{b} $$- and $$ c\overline{c} $$-dijet cross-sections in the forward region of pp collisions at $$ \sqrt{s} $$ = 13 TeV

Aaij

Beteta²,

Ackernley³

et al. 2021

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…Jets containing a heavy quark are an important experimental tool for probing many interesting areas of particle physics, including Higgs physics [1], top physics [2][3][4], and many proposed beyond the Standard Model scenarios. As such, it is important to have a good theoretical understanding of the production and properties of heavy quark jets, which have been lately actively studied in various high energy processes [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Heavy quark jet production near threshold

Dai

Kim

Leibovich

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

In this paper, we study the fragmentation of a heavy quark into a jet near threshold, meaning that final state jet carries most of the energy of the fragmenting heavy quark. Using the heavy quark fragmentation function, we simultaneously resum large logarithms of the jet radius R and 1 − z, where z is the ratio of the jet energy to the initiating heavy quark energy. There are numerically significant corrections to the leading order rate due to this resummation. We also investigate the heavy quark fragmentation to a groomed jet, using the soft drop grooming algorithm as an example. In order to do so, we introduce a collinear-ultrasoft mode sensitive to the grooming region determined by the algorithm’s zcut parameter. This allows us to resum large logarithms of zcut/(1 − z), again leading to large numerical corrections near the endpoint. A nice feature of the analysis of the heavy quark fragmenting to a groomed jet is the heavy quark mass m renders the algorithm infrared finite, allowing a perturbative calculation. We analyze this for EJR ∼ m and EJR » m, where EJ is the jet energy. To do the latter case, we introduce an ultracollinear-soft mode, allowing us to resum large logarithms of EJR/m. Finally, as an application we calculate the rate for e+e− collisions to produce a heavy quark jet in the endpoint region, where we show that grooming effects have a sizable contribution near the endpoint.

show abstract

“…This is one of the main systematic uncertainties in measuring asymmetric heavy quark hadroproduction[72,73,74,75].…”

mentioning

confidence: 99%

Report on scipost_201907_00004v1

Plehn¹

2019

View full text Add to dashboard Cite

A common problem in a high energy physics experiment is extracting a signal from a much larger background. Posed as a classification task, there is said to be an imbalance in the number of samples belonging to the signal class versus the number of samples from the background class. In this work we provide a brief overview of class imbalance techniques in a high energy physics setting. Two case studies are presented: (1) the measurement of the longitudinal polarization fraction in same-sign W W scattering, and (2) the decay of the Higgs boson to charm-quark pairs.

show abstract

Asymmetric heavy-quark hadroproduction at LHCb: predictions and applications

Cited by 8 publications

References 131 publications

Measurement of differential $$ b\overline{b} $$- and $$ c\overline{c} $$-dijet cross-sections in the forward region of pp collisions at $$ \sqrt{s} $$ = 13 TeV

Measurement of differential $$ b\overline{b} $$- and $$ c\overline{c} $$-dijet cross-sections in the forward region of pp collisions at $$ \sqrt{s} $$ = 13 TeV

Heavy quark jet production near threshold

Report on scipost_201907_00004v1

Contact Info

Product

Resources

About