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Prafulla Kumar Behera

Other affiliations: CERN, Aomori University, University of Iowa  ...read more
Bio: Prafulla Kumar Behera is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Large Hadron Collider & Branching fraction. The author has an hindex of 109, co-authored 1204 publications receiving 65248 citations. Previous affiliations of Prafulla Kumar Behera include CERN & Aomori University.


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TL;DR: In this paper, the authors measured the lifetimes of the Hadron-proton collisions at the LHC in proton−proton collision at a luminosity of 19.7°C.
Abstract: Measurements are presented of the lifetimes of the $${\\mathrm {B}^0}$$B0, $$\\mathrm {B}^0_\\mathrm {s}$$Bs0, $$\\mathrm {\\Lambda }_\\mathrm {b} ^0$$Λb0, and $$\\mathrm {B}_\\mathrm {c}^+$$Bc+ hadrons using the decay channels $${\\mathrm {B}^0}\\!\\rightarrow \\! \\mathrm {J}/\\psi \\mathrm {K^{*}(892)}{}^{0}$$B0→J/ψK∗(892)0, $${\\mathrm {B}^0}\\!\\rightarrow \\! \\mathrm {J}/\\psi \\mathrm {K^0_S}$$B0→J/ψKS0, $$\\mathrm {B}^0_\\mathrm {s} \\!\\rightarrow \\! \\mathrm {J}/\\psi \\mathrm {\\pi ^+}\\mathrm {\\pi ^-}$$Bs0→J/ψπ+π-, $$\\mathrm {B}^0_\\mathrm {s} \\!\\rightarrow \\! \\mathrm {J}/\\psi \\mathrm {\\phi (1020)}$$Bs0→J/ψϕ(1020), $$\\varLambda _\\mathrm {b}^0\\!\\rightarrow \\!\\mathrm {J}/\\psi \\mathrm {\\Lambda }^{0}$$Λb0→J/ψΛ0, and $$\\mathrm {B}_\\mathrm {c}^+ \\!\\rightarrow \\!\\mathrm {J}/\\psi \\mathrm {\\pi ^+}$$Bc+→J/ψπ+. The data sample, corresponding to an integrated luminosity of 19.7$$\\,\\text {fb}^\\text {-1}$$fb-1, was collected by the CMS detector at the LHC in proton–proton collisions at $$\\sqrt{s}=8\\,\\text {Te}\\text {V} $$s=8TeV. The $${\\mathrm {B}^0}$$B0 lifetime is measured to be $$453.0 \\pm 1.6\\,\\text {(stat)} \\pm 1.8\\,\\text {(syst)} \\,\\upmu \\text {m} $$453.0±1.6(stat)±1.8(syst)μm in $$\\mathrm {J}/\\psi \\mathrm {K^{*}(892)}{}^{0}$$J/ψK∗(892)0and $$457.8 \\pm 2.7\\,\\text {(stat)} \\pm 2.8\\,\\text {(syst)} \\,\\upmu \\text {m} $$457.8±2.7(stat)±2.8(syst)μm in $$ \\mathrm {J}/\\psi \\mathrm {K^0_S}$$J/ψKS0, which results in a combined measurement of $$c\\tau _{{\\mathrm {B}^0}} = 454.1 \\pm 1.4\\,\\text {(stat)} \\pm 1.7\\,\\text {(syst)} \\,\\upmu \\text {m} $$cτB0=454.1±1.4(stat)±1.7(syst)μm. The effective lifetime of the $$\\mathrm {B}^0_\\mathrm {s}$$Bs0 meson is measured in two decay modes, with contributions from different amounts of the heavy and light eigenstates. This results in two different measured lifetimes: $$c\\tau _{\\mathrm {B}^0_\\mathrm {s} \\rightarrow \\mathrm {J}/\\psi \\mathrm {\\pi ^+}\\mathrm {\\pi ^-}} = 502.7 \\pm 10.2\\,\\text {(stat)} \\pm 3.4\\,\\text {(syst)} \\,\\upmu \\text {m} $$cτBs0→J/ψπ+π-=502.7±10.2(stat)±3.4(syst)μm and $$c\\tau _{\\mathrm {B}^0_\\mathrm {s} \\rightarrow \\mathrm {J}/\\psi \\mathrm {\\phi (1020)}} = 443.9 \\pm 2.0\\,\\text {(stat)} \\pm 1.5\\,\\text {(syst)} \\,\\upmu \\text {m} $$cτBs0→J/ψϕ(1020)=443.9±2.0(stat)±1.5(syst)μm. The $$\\mathrm {\\Lambda }_\\mathrm {b} ^0$$Λb0 lifetime is found to be $$442.9 \\pm 8.2\\,\\text {(stat)} \\pm 2.8\\,\\text {(syst)} \\,\\upmu \\text {m} $$442.9±8.2(stat)±2.8(syst)μm. The precision from each of these channels is as good as or better than previous measurements. The $$\\mathrm {B}_\\mathrm {c}^+$$Bc+ lifetime, measured with respect to the $${\\mathrm {B}^{+}}$$B+ to reduce the systematic uncertainty, is $$162.3 \\pm 7.8\\,\\text {(stat)} \\pm 4.2\\,\\text {(syst)} \\pm 0.1\\,(\\tau _{{\\mathrm {B}^{+}}})\\,\\upmu \\text {m} $$162.3±7.8(stat)±4.2(syst)±0.1(τB+)μm. All results are in agreement with current world-average values.

14 citations

Journal ArticleDOI
Vardan Khachatryan1, Albert M. Sirunyan1, Armen Tumasyan1, Wolfgang Adam  +2256 moreInstitutions (148)
TL;DR: In this article, a search for physics beyond the standard model in final states with at least three charged leptons, in any combination of electrons or muons, is reported.
Abstract: Results are reported from a search for physics beyond the standard model in final states with at least three charged leptons, in any combination of electrons or muons The data sample corresponds to an integrated luminosity of 23 fb^(−1) of proton–proton collisions at √s = 13 TeV, recorded by the CMS experiment at the LHC in 2015 Two jets are required in each event, providing good sensitivity to strong production of gluinos and squarks The search regions, sensitive to a range of different new physics scenarios, are defined using the number of jets tagged as originating from bottom quarks, the sum of the magnitudes of the transverse momenta of the jets, the imbalance in the overall transverse momentum in the event, and the invariant mass of opposite-sign, same-flavor lepton pairs The event yields observed in data are consistent with the expected background contributions from standard model processes These results are used to derive limits in terms of R-parity conserving simplified models of supersymmetry that describe strong production of gluinos and squarks Model-independent limits are presented to facilitate the reinterpretation of the results in a broad range of scenarios for physics beyond the standard model

14 citations

Journal ArticleDOI
Albert M. Sirunyan1, Armen Tumasyan1, Wolfgang Adam, Federico Ambrogi  +2361 moreInstitutions (199)
TL;DR: In this article, a search for heavy resonances decaying into eμ final states in proton-proton collisions recorded by the CMS experiment at the CERN LHC at $ \sqrt{s}=13 $ TeV, corresponding to an integrated luminosity of 35.9 fb$^{−1}$.
Abstract: A search is reported for heavy resonances decaying into eμ final states in proton-proton collisions recorded by the CMS experiment at the CERN LHC at $ \sqrt{s}=13 $ TeV, corresponding to an integrated luminosity of 35.9 fb$^{−1}$. The search focuses on resonance masses above 200 GeV. With no evidence found for physics beyond the standard model in the eμ mass spectrum, upper limits are set at 95% confidence level on the product of the cross section and branching fraction for this lepton-flavor violating signal. Based on these results, resonant τ sneutrino production in R-parity violating supersymmetric models is excluded for masses below 1.7 TeV, for couplings λ$_{132}$ = λ$_{231}$ = λ$_{311}^{′}$ = 0.01. Heavy Z$^{′}$ gauge bosons with lepton-flavor violating transitions are excluded for masses up to 4.4 TeV. The eμ mass spectrum is also interpreted in terms of non-resonant contributions from quantum black-hole production in models with one to six extra spatial dimensions, and lower mass limits are found between 3.6 and 5.6 TeV. In all interpretations used in this analysis, the results of this search improve previous limits by about 1 TeV. These limits correspond to the most sensitive values obtained at colliders.

14 citations

Journal ArticleDOI
Bernard Aubert1, Marcella Bona1, Y. Karyotakis1, J. P. Lees1  +518 moreInstitutions (80)
TL;DR: In this article, the decays of the [overline D]^0 mesons were studied and the authors found that the ratio r_S between the b → u and b → c amplitudes lies in the range [0.07,0.41] at 95% probability.
Abstract: We present a study of the decays B^0 → D^(0)K^(*0) and B^0 →[overline D]^(0)K^(*0) with K^(*0) → K^(+)π^-. The D^0 and the [overline D]^0 mesons are reconstructed in the final states f = K^(+)π^-, K^(+)π^(-)π^0, K^(+)π^(-)π^(+)π^-, and their charge conjugates. Using a sample of 465 × 10^6 B[overline B] pairs collected with the BABAR detector at the PEP-II asymmetric-energy e^(+)e^(-) collider at SLAC, we measure the ratio R_(ADS) ≡ [Γ([overline B]^0 → [f]_D[overline K]^(*0)) + Γ(B^0 → [[overline f]]_(D)K^(*0))]/[Γ([overline B]^0 → [[overline f]]_(D)[overline K]^(*0)) + Γ(B^0 → [f]_(D)K^(*0))] for the three final states. We do not find significant evidence for a signal and set the following limits at 95% probability: R_(ADS)(Kπ) < 0.244, R_(ADS)(Kππ^0) < 0.181, and R_(ADS)(Kπππ) < 0.391. From the combination of these three results, we find that the ratio r_S between the b → u and the b → c amplitudes lies in the range [0.07,0.41] at 95% probability.

14 citations

Journal ArticleDOI
TL;DR: In this paper, a dedicated search is presented for new phenomena in inclusive 8 and 10-jet final states with low missing transverse momentum, with and without identification of jets originating from b quarks.

14 citations


Cited by
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[...]

08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Journal ArticleDOI
01 Apr 1988-Nature
TL;DR: In this paper, a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) is presented.
Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

9,929 citations

Journal ArticleDOI
Georges Aad1, T. Abajyan2, Brad Abbott3, Jalal Abdallah4  +2964 moreInstitutions (200)
TL;DR: In this article, a search for the Standard Model Higgs boson in proton-proton collisions with the ATLAS detector at the LHC is presented, which has a significance of 5.9 standard deviations, corresponding to a background fluctuation probability of 1.7×10−9.

9,282 citations