Shaheen Sardar Ali
A5017555666- Islamic Studies and History
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Gender and Women's Rights
- Human Rights and Development
- International Human Rights and Reproductive Law
- Islamic Finance and Banking Studies
- Politics and Conflicts in Afghanistan, Pakistan, and Middle East
- Gender Politics and Representation
- Historical and Contemporary Political Dynamics
- Marriage and Sexual Relationships
- International Law and Human Rights
- Neutrino Physics Research
- Education and Islamic Studies
- American Constitutional Law and Politics
- Legal Studies and Policies
- Multiculturalism, Politics, Migration, Gender
- Dark Matter and Cosmic Phenomena
- European and International Law Studies
- South Asian Studies and Conflicts
- International Arbitration and Investment Law
- Urban and Rural Development Challenges
- Asian Geopolitics and Ethnography
- Marriage and Family Dynamics
University of Warwick
2003-2024
National Institute for Subatomic Physics
2012-2019
Center for Global Development
2010
University of Peshawar
1996-2003
University of Oslo
2003
University of Hull
1998
A highly significant structure is observed in the $\Lambda_c^+K^-\pi^+\pi^+$ mass spectrum, where $\Lambda_c^+$ baryon reconstructed decay mode $pK^-\pi^+$. The consistent with originating from a weakly decaying particle, identified as doubly charmed $\Xi_{cc}^{++}$. difference between masses of $\Xi_{cc}^{++}$ and states measured to be $1334.94 \pm 0.72 (\mathrm{stat}) 0.27 (\mathrm{syst}~\mathrm{MeV}/c^2$, then determined $3621.40 (\mathrm{syst} 0.14 \, (\Lambda_c^+)~\mathrm{MeV}/c^2$,...
From samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s}=7$, 8 and 13 TeV, corresponding to integrated luminosities 1.0, 2.0 $1.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, respectively, a peak in both ${\mathrm{\ensuremath{\Lambda}}}_{b}^{0}{K}^{\ensuremath{-}}$ ${\mathrm{\ensuremath{\Xi}}}_{b}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ invariant mass spectra is observed. In quark model, radially orbitally excited...
The product of the differential production cross-section and branching fraction decay is measured as a function beauty hadron transverse momentum, pT, rapidity, y. kinematic region measurements pT < 20 GeV/c 2.0 y 4.5. use data sample corresponding to an integrated luminosity 3fb−1 collected by LHCb detector in pp collisions at centre-of-mass energies 2011 2012. Based on previous results fragmentation ratio be
A measurement of the production cross-section for Z bosons that decay to muons is presented. The data were recorded by LHCb detector during pp collisions at a centre-of-mass energy 7 TeV, and correspond an integrated luminosity 1.0 fb−1. measured in pseudorapidity range 2.0 < η 4.5 with transverse momenta pT > 20 GeV/c. dimuon mass restricted 60 M μ + − 120 GeV/c2. $$ {\sigma}_{Z\to \mu }{+}_{\mu }-=\left(76.0\pm 0.3\pm 0.5\pm 1.0\pm 1.3\right)\mathrm{p}\mathrm{b} where uncertainties are due...
Measurements of ${B}_{c}^{+}$ production and mass are performed with the decay mode ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}$ using $0.37\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected in $pp$ collisions at $\sqrt{s}=7\text{ }\mathrm{TeV}$ by LHCb experiment. The ratio cross section times branching fraction between ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}$ decays is measured to be...
The first measurement of heavy-flavor production by the LHCb experiment in its fixed-target mode is presented. J/ψ and D^{0} mesons studied with beams protons different energies colliding gaseous targets helium argon nucleon-nucleon center-of-mass sqrt[s_{NN}]=86.6 110.4 GeV, respectively. cross sections pHe collisions rapidity range [2, 4.6] are found to be σ_{J/ψ}=652±33(stat)±42(syst) nb/nucleon σ_{D^{0}}=80.8±2.4(stat)±6.3(syst) μb/nucleon, where uncertainty statistical second...
A bstract Measurements are reported of the central exclusive production J/ψ and ψ (2 S ) mesons in pp collisions at a centre-of-mass energy 13 TeV. Backgrounds significantly reduced compared to previous measurements made lower energies through use new forward shower counters. The products cross-sections branching fractions for decays dimuons, where both muons within pseudorapidity range 2 . 0 < η 4 5, measured be $$ \begin{array}{c}\hfill {\sigma}_{J/\psi \to {\mu}^{+}{\mu}^{-}} = 435 \pm...
Abstract Through a comparative analysis of crimes 'honour' in India and Pakistan an examination appellate judgments from the two countries, we reflect upon how rights-based discourse modern nation-states forms complex terrain where citizenship state membership communities are negotiated contested through unfolding legal rituals both sites. We identify axes to explore nature interaction between modernity tradition. The first is that governance polities (state statutory bodies) second (caste...
A measurement of the shape differential decay rate and associated Isgur-Wise function for ${\mathrm{\ensuremath{\Lambda}}}_{b}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ is reported, using data corresponding to $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with LHCb detector in proton-proton collisions. The...
We report a measurement of the lifetime $\Omega_c^0$ baryon using proton-proton collision data at center-of-mass energies 7 and 8~TeV, corresponding to an integrated luminosity 3.0 fb$^{-1}$ collected by LHCb experiment. The sample consists about 1000 $\Omega_b^-\to\Omega_c^0\mu^-\bar{\nu}_{\mu} X$ signal decays, where is detected in $pK^-K^-\pi^+$ final state $X$ represents possible additional undetected particles decay. measured be $\tau_{\Omega_c^0} = 268\pm24\pm10\pm2$ fs, uncertainties...
A search for the rare decay $\Sigma^+ \to p \mu^+ \mu^-$ is performed using $pp$ collision data recorded by LHCb experiment at centre-of-mass energies $\sqrt{s} = 7$ and $8$ TeV, corresponding to an integrated luminosity of $3 fb^{-1}$. An excess events observed with respect background expectation, a signal significance 4.1 standard deviations. No significant structure in dimuon invariant mass distribution, contrast previous result from HyperCP experiment. The measured branching fraction...
A search for the lepton-flavour violating decays $B^0_s \rightarrow e^\pm \mu^\mp$ and $B^0 is performed based on a sample of proton-proton collision data corresponding to an integrated luminosity 3 fb$^{-1}$, collected with LHCb experiment at centre-of-mass energies 7 8 TeV. The observed yields are consistent background-only hypothesis. Upper limits branching fractions determined be $\mathcal{B}(B^0_s \mu^\mp) < 5.4\,(6.3) \times 10^{-9}$ $\mathcal{B}(B^0 1.0\,(1.3) $90\%\,(95\%)$...
A search is performed in the invariant mass spectrum of B + π+π− system for excited states c (21S0)+ and (23S1)+ using a data sample pp collisions collected by LHCb experiment at centre-of-mass energy $$ \sqrt{s}=8 TeV, corresponding to an integrated luminosity 2 fb−1. No evidence seen either state. Upper limits on ratios production cross-sections times branching fractions → * +π+π− over cross-section state are given as function their masses. They found be between 0.02 0.14 95% confidence...
A search for CP violation in the decay Λ 0 → pK − μ + is presented. This mediated by flavour-changing neutral-current transitions Standard Model and potentially sensitive to new sources of violation. The study based on a data sample proton-proton collisions recorded with LHCb experiment, corresponding an integrated luminosity 3 fb−1. observed first time, two observables that are different manifestations measured, $$ \Delta {\mathcal{A}}_{CP}\equiv {\mathcal{A}}_{CP}\left({\Lambda}_b^0\to...
The first observation of the $B_s^0 \to \overline{D}^0 K^+ K^-$ decay is reported, together with most precise branching fraction measurement mode $B^0 K^-$. results are obtained from an analysis $pp$ collision data corresponding to integrated luminosity $3.0~\textrm{fb}^{-1}$. were collected LHCb detector at centre-of-mass energies $7$ and $8$ TeV. measured relative that \pi^+ \pi^-$ be $$\frac{\mathcal{B}(B^0 K^-)}{\mathcal{B}(B^0 \pi^-)} = (6.9 \pm 0.4 0.3)\%,$$ where uncertainty...
A bstract search is performed for a spin-0 boson, ϕ , produced in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, using prompt → μ + − decays data sample corresponding to an integrated luminosity approximately 3.0 fb −1 collected with the LHCb detector. No evidence found signal mass range from 5.5 15 GeV. Upper limits are placed on product production cross-section branching fraction into dimuon final state. The comparable best existing over most region considered first be...
A binned Dalitz plot analysis of $B^\pm \to D K^\pm$ decays, with $D\to K_\text{S}^0\pi^+\pi^-$ and K_\text{S}^0K^+K^-$, is used to perform a measurement the CP-violating observables $x_{\pm}$ $y_{\pm}$, which are sensitive Cabibbo-Kobayashi-Maskawa angle $\gamma$. The performed without assuming any $D$ decay model, through use information on strong-phase variation over from CLEO collaboration. Using sample proton-proton collision data collected LHCb experiment in 2015 2016, corresponding an...
A search for the decays $B_c^+ \to J/\psi D^{(*)0} K^+$ and D^{(*)+} K^{*0}$ is performed with data collected at LHCb experiment corresponding to an integrated luminosity of 3 fb$^{-1}$. The D^0 D^{*0} are observed first time, while evidence reported D^{*+} D^+ decays. branching fractions these determined relative \pi^+$ decay. $B_c^+$ mass measured, using $J/\psi final state, be $6274.28 \pm 1.40 (stat) 0.32 (syst)$ MeV/$c^2$. This most precise single measurement date.