Scalar DM with t-channel fermionic colored mediator Laura Lopez - PowerPoint PPT Presentation

Scalar DM with t-channel fermionic colored mediator Laura Lopez Honorez in collaboration with F. Giacchino, A. Ibarra, M. Tytgat & S. Wild to be published soon... TeVPa 2015 - Kashiwa - Japan Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 1 / 12

Introduction t-channel mediator : the well known case of Majorana DM [Bergstrom’89, Flores et al’89 and also Bringmann ’08+, Ciafaloni ’11, Garny ’11+ ] σ v = a + bv 2 a term :s-wave chirally suppressed ∝ ( m f / m χ ) 2 b terms :p-wave v suppression � v 2 � fo ∼ 0 . 2 while � v 2 � GC ∼ 10 − 6 hopeless for indirect detection when m f / m χ ≪ 1 ? ? Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 2 / 12

Introduction t-channel mediator : the well known case of Majorana DM [Bergstrom’89, Flores et al’89 and also Bringmann ’08+, Ciafaloni ’11, Garny ’11+ ] σ v = a + bv 2 a term :s-wave chirally suppressed ∝ ( m f / m χ ) 2 b terms :p-wave v suppression � v 2 � fo ∼ 0 . 2 while � v 2 � GC ∼ 10 − 6 hopeless for indirect detection when m f / m χ ≪ 1 ? ? Not hopeless ! Can get significant signal from χχ → V ¯ ff ! ! The emmission of an extra vector V lifts the chiral suppression ... but suppressed by 3bdy & extra coupling Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 2 / 12

Introduction t-channel mediator : why looking at real Scalar DM ? [Bergstrom ’89+, Bringmann ’08+, Ciafaloni ’11, Garny ’11+,Toma ’13, Giacchino’13,... ] DM = Majorana χ L ⊃ y φ † χ f R + h . c . Z 2 : χ → − χ, Φ → − Φ r = M φ M χ σ v ff | χ = g 4 v 2 1 + r 4 l 48 π M 2 ( 1 + r 2 ) 4 χ p -wave suppressed ( ∝ v 2 for m f → 0) Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 3 / 12

Introduction t-channel mediator : why looking at real Scalar DM ? [Bergstrom ’89+, Bringmann ’08+, Ciafaloni ’11, Garny ’11+,Toma ’13, Giacchino’13,... ] DM = Majorana χ DM = Real Scalar S L ⊃ y S ¯ L ⊃ y φ † χ f R + h . c . ψ f R + h . c . . Z 2 : S → − S , Ψ → − Ψ Z 2 : χ → − χ, Φ → − Φ r = M φ M χ σ v ff | χ = g 4 v 2 1 + r 4 l 48 π M 2 ( 1 + r 2 ) 4 χ p -wave suppressed ( ∝ v 2 for m f → 0) Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 3 / 12

Introduction t-channel mediator : why looking at real Scalar DM ? [Bergstrom ’89+, Bringmann ’08+, Ciafaloni ’11, Garny ’11+,Toma ’13, Giacchino’13,... ] DM = Majorana χ DM = Real Scalar S L ⊃ y S ¯ L ⊃ y φ † χ f R + h . c . ψ f R + h . c . . Z 2 : S → − S , Ψ → − Ψ Z 2 : χ → − χ, Φ → − Φ r = M φ r = M ψ M χ M S σ v ff | χ = g 4 v 2 1 + r 4 σ v ff | S = y 4 v 4 1 l l 48 π M 2 ( 1 + r 2 ) 4 60 π M 2 ( 1 + r 2 ) 4 χ S p -wave suppressed ( ∝ v 2 for m f → 0) d -wave suppressed ( ∝ v 4 for m f → 0) Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 3 / 12

Introduction t-channel mediator : why looking at real Scalar DM ? [Bergstrom ’89+, Bringmann ’08+, Ciafaloni ’11, Garny ’11+,Toma ’13, Giacchino’13,... ] DM = Majorana χ DM = Real Scalar S L ⊃ y S ¯ L ⊃ y φ † χ f R + h . c . ψ f R + h . c . . Z 2 : S → − S , Ψ → − Ψ Z 2 : χ → − χ, Φ → − Φ r = M φ r = M ψ M χ M S σ v ff | χ = g 4 v 2 1 + r 4 σ v ff | S = y 4 v 4 1 l l 48 π M 2 ( 1 + r 2 ) 4 60 π M 2 ( 1 + r 2 ) 4 χ S p -wave suppressed ( ∝ v 2 for m f → 0) d -wave suppressed ( ∝ v 4 for m f → 0) < 0 . 16 � larger Yukawas for S to match Ω dm At f.o. � σ v � ¯ ff | S / � σ v � ¯ ff | χ ∼ In addition, in general, higher order effects are more importants in the scalar case, ie σ v χ ff and σ v χ ff < σ v S VV < σ v S VV , for M dm , y fixed & V = γ, g V ¯ V ¯ [Toma ’13, Giacchino’13 & ’14, Ibarra’14] Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 3 / 12

Introduction Viable param. space for coupling to light quarks L ⊃ yS ¯ ψ q R + h . c . ψ ≡ colored fermion mediator � opportunities for LHC searches Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 4 / 12

Introduction Viable param. space for coupling to light quarks L ⊃ yS ¯ ψ q R + h . c . ψ ≡ colored fermion mediator � opportunities for LHC searches Ω h 2 through freeze-out (f.o.) : σ v VV & σ v V ¯ qq included and σ gg and σ g ¯ qq important at f.o. (away from coann.) Sommerfeld corrections for mediator annihilation included � up to max 15% enhancement / supression of Ω h 2 Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 4 / 12

Introduction Viable param. space for coupling to light quarks L ⊃ yS ¯ ψ q R + h . c . ψ ≡ colored fermion mediator � opportunities for LHC searches Ω h 2 through freeze-out (f.o.) : σ v VV & σ v V ¯ qq included and σ gg and σ g ¯ qq important at f.o. (away from coann.) Sommerfeld corrections for mediator annihilation included � up to max 15% enhancement / supression of Ω h 2 Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 4 / 12

Introduction Direct Detection searches effective DM coupling to q (scalar and twist-2 [Drees’93] ) and g [Hisano’15] included Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 5 / 12

Introduction Direct Detection searches f n /f p ❢♦r ❞❛r❦ ♠❛tt❡r ❝♦✉♣❧✐♥❣ t♦ u R effective DM coupling to q ✹ (scalar and twist-2 [Drees’93] ) and g [Hisano’15] included ✸ effective DM coupling to nucleons f p � = f n � max. ✷ isospin violation at r = 2.6, f n /f p ✶ (3.3) for q = u ,( d ) f n /f p ❢♦r ❝♦✉♣❧✐♥❣ t♦ u R f n /f p = 0 ✵ f n /f p = − 0 . 7 ✲✶ ✲✷ 10 − 2 10 − 1 ✶ ✶✵ ✺✵ r − 1 i ∈ isotopes ξ i ( Z +( A i − Z ) f n / f p ) 2 � σ eff p = σ p · i ∈ isotopes ξ i A 2 � i Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 5 / 12

Introduction Direct Detection searches effective DM coupling to q (scalar and twist-2 [Drees’93] ) and g [Hisano’15] included effective DM coupling to nucleons f p � = f n � max. isospin violation at r = 2.6, (3.3) for q = u ,( d ) LUX probes m S � 200 − 300 GeV + an island around m S ∼ 2 TeV At all masses, viable i ∈ isotopes ξ i ( Z +( A i − Z ) f n / f p ) 2 parameter space out of reach � σ eff p = σ p · � i ∈ isotopes ξ i A 2 Direct DM searches. i Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 5 / 12

Introduction Projection of direct-detection constraints Coupling to u R 10 − 1 1 m ψ m S y thermal > 6 LUX 0 . 1 XENON-1T no thermal relic 0 . 01 5 10 10 2 10 3 10 4 m S [GeV] Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 6 / 12

t❤❡r♠❛❧ ●❡❱ ✭t♦t❛❧✮ t❤❡r♠❛❧ ❡①❝❧✉❞❡❞ ❜② ❬♣❜❪ ❆❚▲❆❙ ✲❥❡t✰ ♦♥❧② ◗❈❉ ❉▼ Introduction Collider constraints Production of colored mediator at the LHC � n -jets+MET ( n > 2) at r small : n > 2 enhance visibility for too soft ψ → uS jets at r large : n > 2 S/Bgd can be larger for n > 2 Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 7 / 12

Introduction Collider constraints Production of colored mediator at the LHC � n -jets+MET ( n > 2) at r small : n > 2 enhance visibility for too soft ψ → uS jets at r large : n > 2 S/Bgd can be larger for n > 2 y t❤❡r♠❛❧ 0 . 1 1 2 4 6 10 3 m ψ = 500 ●❡❱ uu σ ✭t♦t❛❧✮ 10 2 t❤❡r♠❛❧ 10 ❡①❝❧✉❞❡❞ ❜② u ¯ u σ ❬♣❜❪ ❆❚▲❆❙ n ✲❥❡t✰ / E T 1 σ ♦♥❧② ◗❈❉ gg 10 − 1 d ¯ d 10 − 2 10 − 2 10 − 1 1 10 10 2 m ψ /m ❉▼ − 1 � Enhanced production σ including y = y thermal Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 7 / 12

Introduction Constraints derived from ATLAS multijet analysis Coupling to u R We use : ATLAS-CONF-2013-047 for 10 2-6 jets +MET at √ s = 8 TeV L = 20 . 3 fb − 1 − 1 � limits on the number of 1 m ψ m S ATLAS signal events S y thermal > 6 LUX We recompute σ excl ( r , m DM ) 0 . 1 XENON-1T evaluating efficiencies no thermal relic ǫ = N cut / N events using 0 . 01 5 10 10 2 10 3 10 4 Madgraph & CheckMATE m S [GeV] We get σ ( r , m DM , y thermal ) (tree-level) using calchep and compare to σ excl ( r , m DM ) � Can exclude DM models up to ∼ 1 TeV for the large r − y thermal region Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 8 / 12

Introduction Indirect detection constraints σ gg + σ g ¯ qq ≡ 95 − 100 % σ v tot today � γ & ¯ p constraints rough estimation of Fermi dSphs bound on σ gg & σ g ¯ qq using integrated specra for E γ = [ 0 . 5 , 500 ] GeV Typically probe the r > 1 . 2 & m S < 150 GeV � complement direct detection and collider searches at low DM mass Laura Lopez Honorez (TENA-VUB) Scalar DM & colored mediator October 26, 2015 9 / 12