NNLO charmed-meson fragmentation functions and their uncertainties in the presence of meson mass corrections

Observing light or heavy charged Higgs bosons $$H^\pm $$ H ± , lighter or heavier than the top quark, would be instant evidence of physics beyond the Standard Model. For this reason, in recent years searches for charged Higgs bosons have been in the center of attention of current colliders such as the CERN Large Hadron Collider (LHC). In spite of all efforts, no signal has been yet observed. Especially, the results of CMS and ATLAS experiments have excluded a large region in the MSSM $$m_{H^+}-\tan \beta $$ m H + - tan β parameter space for $$m_{H^+}=80{-}160$$ m H + = 80 - 160 GeV corresponding to the entire range of $$\tan \beta $$ tan β up to 60. Therefore, it seems that one should concentrate on probing heavy charged Higgs bosons ($$m_{H^\pm }>m_t$$ m H ± > m t ) so in this context each new probing channel is welcomed. In this work, we intend to present our proposed channel to search for heavy charged Higgses through the study of scaled-energy distribution of bottom-flavored mesons (B) inclusively produced in charged Higgs decay, i.e., $$H^+\rightarrow t\bar{b}\rightarrow B+X$$ H + → t b ¯ → B + X . Our study is carried out within the framework of the generic two Higgs doublet model (2HDM) using the massless scheme where the zero mass parton approximation is adopted for bottom quark.

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“…This would be possible by using the nonperturbative (b, g) → π/K /P/D + FFs presented in Refs. [42][43][44][45].…”

Section: Discussionmentioning

confidence: 99%

Probing heavy charged Higgs bosons through bottom flavored hadrons in the $$H^+\rightarrow \bar{b}t\rightarrow B+X$$ channel in 2HDM

Nejad

Yarahmadi

2021

Eur. Phys. J. C

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“…The FFs along with the parton distribution functions (PDFs) make the low-energy sectors of scattering processes so they are related to the nonperturbative regime of QCD. Fortunately, the factorization theorem of QCD-improved parton model [18,19] allows us to divide the perturbative and nonperturbative parts of scattering processes. Here we consider two examples; the leptonhadron and lepton-lepton scattering processes.…”

Section: Production Cross Section Of Hadronsmentioning

confidence: 99%

S-wave heavy pentaquark production in direct fragmentation of heavy quark

Moosavi Nejad,

Farashahian

2023

Phys. Scr.

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Study of exotic hadrons with configurations beyond the naive quark model has attracted a lot of interests in recent years. Due to their complicated configuration many theoretical models have been designed for describing their structure. Understanding the production mechanism of exotic hadrons could be helpful to find out their inner structure and to test the theory of QCD as well. It is well-known that the dominant production mechanism for conventional heavy hadrons with large transverse momentum is fragmentation so as this mechanism could also be extended to heavy pentaquarks production. This work is a first effort to study the direct fragmentation of heavy quarks into ground state heavy pentaquarks in leading order of perturbative QCD. Considering the picture of compact pentaquark states, through the Suzuki approach we will compute the fragmentation function of heavy quarks into S-wave heavy pentaquarks. The production cross section of heavy pentaquarks through pair annihilation will also be estimated at lowest order of perturbative QCD.

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“…The Hessian method can also be used to estimate the polarized PDFs and fragmentation functions [62][63][64][65][68][69][70][71].…”

Section: Technical Detail Of Qcd Analysismentioning

confidence: 99%

Improved determination of strange distribution function from the global analysis using BHPS model

Salajegheh,

Nejad,

Tehrani

2021

Preprint

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We study the impact of intrinsic strange (IS) component of nucleon sea on the global analysis of parton distribution functions (PDFs) considering a wide range of experimental data. To this aim, we consider two scenarios on the basis of BHPS model results for the IS distribution. In the first scenario, we apply the results presented through the BHPS model and in the second scenario we use its evolved distributions. For each scenarios, we present the limit of the IS probability P ss 5 for the standard tolerance criteria ∆χ 2 = 1 and 18.112 at 1σ and 4σ levels. Our results show that the experimental data can tolerate an IS component with a greater probability P ss 5 if one employs the second scenario. We obtain P ss 5 ≈ 0.01 and P ss 5 ≈ 0.025 for ∆χ 2 = 1 and 18.112, respectively, at the 4σ level. We also calculate the ratio of strange-to-light sea-quark densities rs in the proton both including and excluding the IS component. Our results show that one can obtain a higher value for the ratio rs if the IS component is included.

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NNLO charmed-meson fragmentation functions and their uncertainties in the presence of meson mass corrections

Cited by 24 publications

References 56 publications

Probing heavy charged Higgs bosons through bottom flavored hadrons in the $$H^+\rightarrow \bar{b}t\rightarrow B+X$$ channel in 2HDM

Probing heavy charged Higgs bosons through bottom flavored hadrons in the $$H^+\rightarrow \bar{b}t\rightarrow B+X$$ channel in 2HDM

S-wave heavy pentaquark production in direct fragmentation of heavy quark

Improved determination of strange distribution function from the global analysis using BHPS model

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