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  • Bremsstrahlung and gamma ray linesin different dark matter scenarios

    Laura Lopez Honorez

    mainly based on JCAP 1310 (2013) 025 and JCAP 08 (2014) 046in collaboration with F. Giacchino and M. Tytgat

    KUBEC International Workshop on Dark Matter SearchesAugust 27-29, 2014, Brussels, Belgium.

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 1 / 19

  • Introduction

    We would like to have smoking gun evidence for DM

    like e.g. sharp spectral features, such as lines, in the gamma ray spectrum :

    Particle physics input

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 2 / 19

  • Introduction

    We would like to have smoking gun evidence for DM

    like e.g. sharp spectral features, such as lines, in the gamma ray spectrum :

    Possibly including pronounced spectral features

    More easily discriminated from backgrounds

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 2 / 19

  • Introduction

    We would like to have smoking gun evidence for DM

    like e.g. sharp spectral features, such as lines, in the gamma ray spectrum :

    Generic candidates Careful!!

    The importance of the line compared to the continuum depends on their relative contribution to the total annihilation cross-section

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 2 / 19

  • Introduction

    How about gamma ray lines ?

    Naively neutral DM through radiativeprocess

    vvAn

    (

    )2 105

    Considering e.g. WIMPS, one can argue

    vAn 1026 cm3/s v 1031cm3/sBeyond the reach of current experiments !

    Well known tricks to enhance v :

    velocity dependent annihilation

    richer DM sector with coannihilations

    annihilation near thresholds and resonances[see e.g. Jackson09+, Lee 12, Tulin 12, Cline 12...]

    Tulin 12

    Hess 13

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 3 / 19

  • Introduction

    How about gamma ray lines ?

    Naively neutral DM through radiativeprocess

    vvAn

    (

    )2 105

    Considering e.g. WIMPS, one can argue

    vAn 1026 cm3/s v 1031cm3/sBeyond the reach of current experiments !

    Well known tricks to enhance v :

    velocity dependent annihilation

    richer DM sector with coannihilations

    annihilation near thresholds and resonances[see e.g. Jackson09+, Lee 12, Tulin 12, Cline 12...]

    Tulin 12

    Hess 13

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 3 / 19

  • Introduction

    How about gamma ray lines ?

    Naively neutral DM through radiativeprocess

    vvAn

    (

    )2 105

    Considering e.g. WIMPS, one can argue

    vAn 1026 cm3/s v 1031cm3/sBeyond the reach of current experiments !

    Well known tricks to enhance v :

    velocity dependent annihilation

    richer DM sector with coannihilations

    annihilation near thresholds and resonances[see e.g. Jackson09+, Lee 12, Tulin 12, Cline 12...]

    Tulin 12

    Hess 13

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 3 / 19

  • Introduction

    How about Internal Bremsstrahlung emmission ?[Bergstrom89, Flores et al89 and also Bringmann 08+, Ciafaloni 11, Garny 11+ ]

    Well known case of a Majorana Fermion f f

    v = a + bv2

    a term :s-wave (mf /m)2b term :p-wave v2

    p-wave term seems suppressed today :v2fo 0.2 while v2GC 106

    but dominates over s-wave (mf /m)2

    m = 100 GeV abv2GC 105 (f = e)

    vGC 5 106vfo 1031cm3/s

    hopeless for indirect detection ? ?

    Not hopeless ! Can get significant signal from f f ! !The emmission of an extra lifts the chiral suppression

    ... but suppressed by 3bdy & extra coupling

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 4 / 19

  • Introduction

    How about Internal Bremsstrahlung emmission ?[Bergstrom89, Flores et al89 and also Bringmann 08+, Ciafaloni 11, Garny 11+ ]

    Well known case of a Majorana Fermion f f

    v = a + bv2

    a term :s-wave (mf /m)2b term :p-wave v2

    p-wave term seems suppressed today :v2fo 0.2 while v2GC 106

    but dominates over s-wave (mf /m)2

    m = 100 GeV abv2GC 105 (f = e)

    vGC 5 106vfo 1031cm3/s

    hopeless for indirect detection ? ?

    Not hopeless ! Can get significant signal from f f ! !The emmission of an extra lifts the chiral suppression

    ... but suppressed by 3bdy & extra coupling

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 4 / 19

  • Introduction

    How about Internal Bremsstrahlung emmission ?[Bergstrom89, Flores et al89 and also Bringmann 08+, Ciafaloni 11, Garny 11+ ]

    Well known case of a Majorana Fermion f f

    v = a + bv2

    a term :s-wave (mf /m)2b term :p-wave v2

    p-wave term seems suppressed today :v2fo 0.2 while v2GC 106

    but dominates over s-wave (mf /m)2

    m = 100 GeV abv2GC 105 (f = e)

    vGC 5 106vfo 1031cm3/s

    hopeless for indirect detection ? ?

    Not hopeless ! Can get significant signal from f f ! !The emmission of an extra lifts the chiral suppression

    ... but suppressed by 3bdy & extra coupling

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 4 / 19

  • Models

    Simple modelswith significant Bremsstrahlung emission

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 5 / 19

  • Models

    Significant bremsstrahlung : in which models ?[see also Bringmann 08+, Ciafaloni 11, Garny 11+,... ]

    DM = Majorana

    ,N

    [Bergstrom 89+]

    L gllR + h.c.

    Z2 : ,

    r = MM

    vll| =g4l

    48v2

    M2

    1 + r4

    (1 + r2)4

    p-wave suppressed ( v2 for mf 0)

    DM = Real Scalar S[Toma 13, Giacchino, LLH& Tytgat13]

    L yl S lR + h.c. .

    Z2 : S S,

    r = MMS

    vll|S =y4l

    60v4

    M2S

    1(1 + r2)4

    d-wave suppressed ( v4 for mf 0)

    DM DM ll is chirally ( (mf /Mdm)2) or velocity suppressed

    Annihilation processes show a dependence in r = MNLZP/Mdm 1

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 6 / 19

  • Models

    Significant bremsstrahlung : in which models ?[see also Bringmann 08+, Ciafaloni 11, Garny 11+,... ]

    DM = Majorana

    ,N

    [Bergstrom 89+]

    L gllR + h.c.

    Z2 : ,

    r = MM

    vll| =g4l

    48v2

    M2

    1 + r4

    (1 + r2)4

    p-wave suppressed ( v2 for mf 0)

    DM = Real Scalar S[Toma 13, Giacchino, LLH& Tytgat13]

    L yl S lR + h.c. .

    Z2 : S S,

    r = MMS

    vll|S =y4l

    60v4

    M2S

    1(1 + r2)4

    d-wave suppressed ( v4 for mf 0)

    DM DM ll is chirally ( (mf /Mdm)2) or velocity suppressed

    Annihilation processes show a dependence in r = MNLZP/Mdm 1

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 6 / 19

  • Models

    Significant bremsstrahlung : in which models ?[see also Bringmann 08+, Ciafaloni 11, Garny 11+,... ]

    DM = Majorana

    ,N

    [Bergstrom 89+]

    L gllR + h.c.

    Z2 : ,

    r = MM

    vll| =g4l

    48v2

    M2

    1 + r4

    (1 + r2)4

    p-wave suppressed ( v2 for mf 0)

    DM = Real Scalar S[Toma 13, Giacchino, LLH& Tytgat13]

    L yl S lR + h.c. .

    Z2 : S S,

    r = MMS

    vll|S =y4l

    60v4

    M2S

    1(1 + r2)4

    d-wave suppressed ( v4 for mf 0)

    DM DM ll is chirally ( (mf /Mdm)2) or velocity suppressed

    Annihilation processes show a dependence in r = MNLZP/Mdm 1

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 6 / 19

  • Models

    Significant bremsstrahlung : in which models ?[see also Bringmann 08+, Ciafaloni 11, Garny 11+,... ]

    DM = Majorana ,N[Bergstrom 89+] [Barger11, Giacchino, LLH& Tytgat14]

    L gllR or gNW NlR + h.c.

    Z2 : ,

    r = MM ,MWMN

    vll|,Nr g

    4

    48v2

    M2,N

    1r4

    p-wave suppressed ( v2 for mf 0)

    DM = Real Scalar S[Toma 13, Giacchino, LLH& Tytgat13]

    L yl S lR + h.c. .

    Z2 : S S,

    r = MMS

    vll|S =y4l

    60v4

    M2S

    1(1 + r2)4

    d-wave suppressed ( v4 for mf 0)

    DM DM ll is chirally ( (mf /Mdm)2) or velocity suppressed

    Annihilation processes show a dependence in r = MNLZP/Mdm 1

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 6 / 19

  • Models

    Significant bremsstrahlung : in which models ?[see also Bringmann 08+, Ciafaloni 11, Garny 11+,... ]

    DM = Majorana ,N[Bergstrom 89+] [Barger11, Giacchino, LLH& Tytgat14]

    L gllR or gNW NlR + h.c.

    Z2 : ,

    r = MM ,MWMN

    vll|,Nr g

    4

    48v2

    M2,N

    1r4

    p-wave suppressed ( v2 for mf 0)

    DM = Real Scalar S[Toma 13, Giacchino, LLH& Tytgat13]

    L yl S lR + h.c. .

    Z2 : S S,

    r = MMS

    vll|S =y4l

    60v4

    M2S

    1(1 + r2)4

    d-wave suppressed ( v4 for mf 0)

    DM DM ll is chirally ( (mf /Mdm)2) or velocity suppressed

    Annihilation processes show a dependence in r = MNLZP/Mdm 1

    Laura Lopez Honorez (TENA-VUB) DM: Bremsstrahlung & ray lines August 28, 2014 6 / 19

  • Models

    2 bdy annihilation cross-sections at freeze-out

    g, y = 1,Mdm = 100 GeV

    At f.o. vll|S/vll|,N < 1 larger Yukawas for S to match dm

    Laura Lopez Honorez (TENA-VUB) DM: Brems